CN105296853B - A kind of 930MPa high-intensity fine rollings screw-thread steel and its preparation technology - Google Patents
A kind of 930MPa high-intensity fine rollings screw-thread steel and its preparation technology Download PDFInfo
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- CN105296853B CN105296853B CN201510863527.1A CN201510863527A CN105296853B CN 105296853 B CN105296853 B CN 105296853B CN 201510863527 A CN201510863527 A CN 201510863527A CN 105296853 B CN105296853 B CN 105296853B
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- 238000005096 rolling process Methods 0.000 title claims abstract description 121
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 108
- 239000010959 steel Substances 0.000 title claims abstract description 108
- 238000005516 engineering process Methods 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 94
- 238000000034 method Methods 0.000 claims abstract description 47
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 23
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 23
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- 230000011218 segmentation Effects 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 81
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 61
- 238000007670 refining Methods 0.000 claims description 48
- 238000010438 heat treatment Methods 0.000 claims description 28
- 235000019628 coolness Nutrition 0.000 claims description 26
- 229910052742 iron Inorganic materials 0.000 claims description 23
- 238000010079 rubber tapping Methods 0.000 claims description 21
- 229910052799 carbon Inorganic materials 0.000 claims description 20
- 238000005266 casting Methods 0.000 claims description 20
- 239000002893 slag Substances 0.000 claims description 20
- 238000009749 continuous casting Methods 0.000 claims description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 14
- 230000008676 import Effects 0.000 claims description 14
- 229910052760 oxygen Inorganic materials 0.000 claims description 14
- 239000001301 oxygen Substances 0.000 claims description 14
- 238000003801 milling Methods 0.000 claims description 13
- 238000005496 tempering Methods 0.000 claims description 9
- 238000007664 blowing Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910000628 Ferrovanadium Inorganic materials 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 239000000470 constituent Substances 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 7
- -1 ferrovanadium nitride Chemical class 0.000 claims description 7
- 239000012467 final product Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 230000014759 maintenance of location Effects 0.000 claims description 7
- 238000011017 operating method Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- 238000012840 feeding operation Methods 0.000 claims description 5
- 238000007688 edging Methods 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000005272 metallurgy Methods 0.000 abstract description 2
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- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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Abstract
Metallurgy industry spiral production technical field of the present invention, more particularly to a kind of 930MPa high-intensity fine rollings screw-thread steel and its preparation technology.The composition of the 930MPa high-intensity fine rolling screw-thread steels is：C：0.40 0.50%, Mn：0.80 1.20%, Si：1.45 1.85%, V：0.120 0.220%, S≤0.030%, P≤0.030%, balance of Fe, preparation technology using " steel billet cold charge enter to heat the discontinuous control of stove heat+whole process low temperature controlled rolling+repeatedly it is cold+that pinch roll pinches tail steel+Double Dimension Flying Shears segmentation+cold bed cooling+interior stacking heap is cold " rolling process route.The 930MPa high-intensity fine rolling screw-thread steels low production cost, quality stability are high, and the preparation technology flow is short, finish rolling excellent effect, roller repairing effect is significant and do not damage or to reduce reinforcing bar quality, economic benefit and society notable.
Description
(1) technical field
The present invention relates to metallurgy industry spiral production technical field, more particularly to a kind of 930MPa high-intensity fine rollings spiral shell
Line steel and its preparation technology.
(2) background technology
930MPa finish rolling deformed bars are at home and abroad generally produced using Tempering and Quenching mode at present.To this kind of
When material product long is heat-treated, both at home and abroad from it is more be sensing heating mode of heating.Sensing heating is to utilize electromagnetic induction
Inside workpiece produces vortex, the method that workpiece reaches estimating temperature by the Joule heat of these electric currents during principle makes alternating magnetic field.
At home, the quenched once someone of sensing heating is carried out to large gauge ribbed bar and did research, the 930MPa grades of research and development of reinforcing bar of China's Anshan iron and steel plant
Patent is exactly that the sensing heating for using is heat-treated.
At present, major part enterprise takes heat-treated offline process route to produce 930MPa high-intensity fine rolling screw-thread steels both at home and abroad
Product, the technological process of production is：Feeding skid+dial steel device by root dials steel+conveyor roller+1# induction furnaces (being heated to 820 DEG C)+extensive
Multiple section+2# induction furnaces (being heated to 920 DEG C)+recover section+quenching box treatment (water-cooled is to 400 DEG C)+recover section+3# induction furnaces (are returned
Fire treatment is to 580-600 DEG C)+runout table+blanking rack+natural cooling+saw head, cut scale.This process route long flow path,
High cost, product quality stability are limited, and cooling is cold by force using one-time continuous in its technique, and surface martensite is blocked up, is easily caused
The problems such as elongation is unqualified.
The present invention proposes a kind of different from Heat Treatment technique and the new technology of offline quenching-and-tempering process
Route, the 930MPa high-intensity fine rolling screw thread product made from steel of process route production is to realize that quality index is steady without heat-treated offline
Fixed qualified, product quality is high, cost 300 yuan/t-500 units lower than heat-treated offline technique/t, remarkable in economical benefits.
(3) content of the invention
The present invention is in order to make up the deficiencies in the prior art, there is provided a kind of low production cost, quality stability are high
930MPa high-intensity fine rolling screw-thread steels, while also providing a kind of flow for preparing the 930MPa high-intensity fine rolling screw-thread steels
Short, finish rolling excellent effect, roller repairing effect is significant and do not damage or reduce reinforcing bar quality, the technique of remarkable in economical benefits, solution
Determine problems of the prior art.
The present invention is achieved through the following technical solutions：
A kind of 930MPa high-intensity fine rollings screw-thread steel, is made up of the composition of following percentage by weight：C：0.40-0.50%,
Mn：0.80-1.20%, Si：1.45-1.85%, V：0.120-0.220%, S≤0.030%, P≤0.030%, balance of Fe.
The preparation technology of the 930MPa high-intensity fine rolling screw-thread steels, including following operating procedure：
It is prepared by A steel billets：
(1) converter is slightly refined：By molten iron, (main component is C, Si, Mn, P, S, and remaining is Fe elements, and constituent content control will
Seek Si≤0.70%, P≤0.13%, S≤0.055%, other are without specific requirement) and steel scrap according to 9:1 weight turns than adding
Stove blows 13-15 minutes；Blowing is finished, and controls endpoint carbon content >=0.06%, outlet temperature≤1680 DEG C；Add in tapping process
Plus silicomangan and ferrovanadium nitride alloy element (element addition is adjusted accordingly according to C, Si, Mn actual content), it is ensured that
Weight content≤0.35% of the C of terminal molten iron, weight content≤1.3% of Si, weight content≤0.70% of Mn；
(2) LF stoves refining：The molten steel that step (1) is tapped is hung to the refining of LF stoves, refining furnace uses carborundum and ferrosilicon powder
Carry out making white slag operation, slag to be refined carries out trimming operation again after adjusting to white, it is ensured that composition is all in the model of above-mentioned elemental composition
In enclosing；It is required that refining time >=30 minute, white slag retention time >=20 minute, are carried out after completing refining operation by 2 ± 0.1m/t
Line feeding is operated.Ensure outer soft blow time >=15 minute of line.Tapping temperature control is at 1555 DEG C -1565 DEG C when refining furnace is tapped；Essence
Carry out determining oxygen operation before furnace tapping, by free Control for Oxygen Content within 12ppm；
(3) continuous small-billet casting：Step (2) is hung to cast station through the molten steel that LF stoves are refined.Continuous casting production uses plug
Rod bag is produced, and whole process protection cast, tundish temperature is controlled at 1505 DEG C -1525 DEG C, and casting speed control is in 1.3m/min-1.6m/
Min, it is desirable to which whole to draw the fluctuation of steel process pulling speed of continuous casting to be less than ± 0.01m/min, liquid level fluctuation of crystallizer is less than ± 3mm；Continuous casting
Into small billet, the billet scaling of different length is cut into according to different rolling specs；
B is rolled：
The small billet cold charge that step A is poured into a mould is entered to heat stove heat, 1080 ± 30 DEG C of furnace temperature of heating furnace, small billet is in heating
960-1000 DEG C is heated in stove, rolling of being come out of the stove behind heat time >=1.5 hour；Using whole process stream low temperature controlled rolling：By what is come out of the stove
Small billet sends into mill milling, and a de-scaling is first carried out to steel billet for removing the iron scale on small billet surface, subsequently into
Roughing mill, rolls 6 passages, mill speed altogether：0.34m/s-1.75m/s；Rolling time 46-48s；Milling train in entering afterwards,
4 passages, mill speed are rolled altogether：2.40m/s-4.32m/s；Rolling time 46-48s；Finishing mill is finally entered, 4 are rolled altogether
Individual passage, mill speed：5.50m/s-8.50m/s；Rolling time 46-48s；
C is post-processed：
The Finished rolled steel that step B is rolled is carried out into cooling treatment by the way of discontinuous control is cold, is supplied by roller-way after cooling
To cold bed, then Double Dimension Flying Shears segmentation, cold bed tempering cooling, indoor stacking heap are cold, obtain final product；
Discontinuous control described in step C is cold cold first to wear the discontinuous control that recovers after water；
It is that first to wear the discontinuous control recovered after water three times cold that discontinuous control described in step C is cold；
First wear that the discontinuous control recovered after water is cold to be for described three times：
Recover section after first time Water cooling：Enter " 60-80 meters " recovery after controlled rolling " 4 meters+4 meters " two Water coolings
Section；This section of temperature of Water cooling import is 800 ± 20 DEG C, and hydraulic pressure control is 0.40 ± 0.30MPa；
Recover section after second Water cooling：Enter after 4 meters of Water coolings of controlled rolling one 4 meters of recover sections enter back into one 4 meters it is extensive
Multiple section；This section of cooling water pressure≤0.60MPa of Water cooling；
Recover section after third time Water cooling：Enter after 2 meters of Water coolings of controlled rolling one 2 meters of recover sections enter back into one 4 meters it is extensive
Multiple section；This section of temperature of Water cooling import is 550 ± 10 DEG C, and hydraulic pressure control is 0.20MPa ± 0.02.
Using the essence of " elliptical aperture+K1 finished holes of the K4 elliptical aperture+K3 edging pass for rolling+K2 with bottom land convexity " in step B rollings
Rolling pass schedule carries out finish rolling.
Step C Double Dimension Flying Shears are segmented into " 5# flying shears " segmentation.
Using the essence of " elliptical aperture+K1 finished holes of the K4 elliptical aperture+K3 edging pass for rolling+K2 with bottom land convexity " in step B rollings
Rolling pass schedule carries out finish rolling.
Step C cold beds temperature is 650-670 DEG C.
The beneficial effects of the invention are as follows：
Preparation technology of the present invention is both different from the sensing heating heat-treated offline technology road of domestic and international high cost technology path
Line, also different from：The low quality technology path of Heat Treatment by Rolling Heat, by above-mentioned brand-new processing technology routine, takes one
Series of processes and equipment technology innovative measure, cost are lower than sensing heating heat-treated offline 300-500 yuan/ton, quality stability
Far above Heat Treatment by Rolling Heat processing technology routine, and realize that 930MPa is high-strength under the conditions of new low cost process technology path
Spend the steady production and steady quality of finish rolling deformed bar.Major advantage and effect are as follows：
1st, implement first to wear the discontinuous control recovered after water for three times cold in post-processing step, it is to avoid the strong cold, tables of one-time continuous
Elongation does not conform to problem caused by face martensite blocked up (more than 1.5mm), and interruption is ensure that by the control to hydraulic pressure and water
The mitigation of the cold falling temperature gradient of formula control, it is to avoid the too fast generation abnormal structure of controlled rolling cooling velocity.
2nd, by the 4# flying shears of former Double Dimension Flying Shears, substituted using 5# flying shears, be exclusively used in the multiple length segmentation of 930MPa finish rolling screw threads,
Overcome cold bed difficulty on former Double Dimension Flying Shears shear ability deficiency, tail steel, cause unstable properties because tail steel transporting velocity fluctuates
Problem.
3rd, Double Dimension Flying Shears entrance sets pinch roll on new, implements tail steel clamp and send technique, realizes and rolls rear rebar full length constant speed
Rolling, constant speed control are cold, ensure that the uniformity of rebar full length performance.
4th, the finishing pass sequence of " elliptical aperture+K1 finished holes of the K4 elliptical aperture+K3 edging pass for rolling+K2 with bottom land convexity ", it is real
Show the high-precision control high, wide and cross rib height of reinforcing bar basic circle, meet the high accuracy connection between reinforcing bar and connector；Design
Pass shears, make reinforcing bar in fixed size scissors shear history, bear three-dimensional compressive stress, solve the problems, such as bar cutting fragmentation.
5th, the yield strength of 930Mpa fining twisted steels obtained in preparation technology 50-120MPa high compared with GB 930MPa,
Tensile strength 50-170MPa high compared with GB 1080MPa, elongation percentage is compared with the 1.0%-4.0% high of GB 6.0%, and quality stability is high,
Product with stable quality.
| Mechanical property | Yield strength MPa | Tensile strength MPa | Elongation percentage % |
| Mechanical property numerical value | 980-1050 | 1130-1250 | 7.0-10.0 |
(4) specific embodiment
With reference to embodiment, the invention will be further described, but the invention is not limited in this.
Embodiment 1：
A kind of preparation technology of 930MPa high-intensity fine rollings screw-thread steel：Using following operating procedure：
It is prepared by A steel billets：
(1) converter is slightly refined：By molten iron, (main component is C, Si, Mn, P, S, and remaining is Fe elements, and constituent content control will
Seek Si≤0.70%, P≤0.13%, S≤0.055%, other are without specific requirement) and steel scrap according to 9：1 weight turns than adding
Stove carries out blowing operation, and duration of blast 14 minutes, blowing is finished and requires endpoint carbon content >=0.06%, outlet temperature≤1680
℃；(element addition is carried out according to C, Si, Mn actual content for addition silicomangan and ferrovanadium nitride alloy element in tapping process
Corresponding adjustment), it is ensured that weight content≤0.35% of the C of terminal molten iron, weight content≤1.3% of Si, the weight content of Mn
≤ 0.70%.
(2) LF stoves refining：The molten steel that step (1) is tapped is hung to the refining of LF stoves：Refining furnace uses carborundum and ferrosilicon powder
Carry out making white slag operation, slag to be refined carries out trimming operation again after adjusting to white, it is ensured that composition is all in the model of above-mentioned elemental composition
In enclosing；Refining time 30 minutes, 20 minutes white slag retention times, line feeding operation is carried out after completing refining operation by 2m/t, it is ensured that
The line outer 15 minutes soft blow time；Tapping temperature control is at 1555 DEG C when refining furnace is tapped；Carry out determining oxygen operation before refining furnace tapping,
By free Control for Oxygen Content within 12ppm.
(3) continuous small-billet casting：Step (2) is hung to cast station through the molten steel that LF stoves are refined, continuous casting production uses plug
Rod bag is produced, and whole process protection cast, tundish temperature is controlled at 1505 DEG C, and casting speed control is in 1.3m/min, it is desirable to entirely draw steel
The fluctuation of process pulling speed of continuous casting is less than ± 0.01m/min, and liquid level fluctuation of crystallizer is less than ± 3mm；It is casting continuously to form 165mm × 165mm rule
The small billet of lattice, the billet scaling of different length is cut into according to different rolling specs.The chemical composition of the steel billet is：C：
0.40%th, Mn：0.80%th, Si：1.45%th, V：0.120%th, S：0.030%th, P：0.030%, balance of Fe.
B is rolled：
The small billet cold charge that step A is poured into a mould is entered to heat stove heat, 1080 DEG C of furnace temperature of heating furnace, small billet is in heating furnace
Be heated to 960 DEG C, heating is come out of the stove rolling after 1.5 hours；Using whole process stream low temperature controlled rolling：The small billet come out of the stove is sent into milling train
Rolling, first carries out a de-scaling for removing the iron scale on small billet surface to steel billet, subsequently into roughing mill, 6 is rolled altogether
Individual passage, mill speed：0.34m/s；Rolling time 46s；Milling train in entering afterwards, rolls 4 passages, mill speed altogether：
2.40m/s；Rolling time 46s；Finishing mill is finally entered, 4 passages, mill speed are rolled altogether：5.50m/s；Rolling time
46s；Finally give Finished rolled steel.
C is post-processed：
The Finished rolled steel that step B is rolled first is worn the cold mode of discontinuous control replied after water using three times and carried out at cooling
Reason, including controlled rolling and controlled cooling and recover section arrangement, design parameter and operation：
Recover section after first time Water cooling：Enter one 80 meters of recover sections after controlled rolling " 4 meters+4 meters " two Water coolings；The section
The temperature of Water cooling import is 800 DEG C, and hydraulic pressure control is 0.40MPa；
Recover section after second Water cooling：Enter after 4 meters of Water coolings of controlled rolling one 4 meters of recover sections enter back into one 4 meters it is extensive
Multiple section；The cooling water pressure of this section of Water cooling is controlled to 0.60MPa；
Recover section after third time Water cooling：Enter after 2 meters of Water coolings of controlled rolling one 2 meters of recover sections enter back into one 4 meters it is extensive
Multiple section；This section of temperature of Water cooling import is 550 DEG C, and hydraulic pressure control is 0.20MPa.
Quickly supplied by roller-way after above-mentioned three Water coolings to cold bed, pinch roll ensures reinforcing bar poker during pinching
Velocity-stabilization, it is ensured that reinforcing bar poker velocity-stabilization, pinch process is pinched using automatic detection identification tail steel system；Then enter
Row 5# Double Dimension Flying Shears are segmented, overcome that former Double Dimension Flying Shears shear ability is not enough, on tail steel cold bed it is difficult, because tail steel transporting velocity fluctuates
Cause the problem of unstable properties；Cold bed tempering cooling, indoor stacking heap are carried out again cold 7 days, obtain final product a kind of 930MPa high intensity
Fining twisted steel.
The chemical composition of the 930MPa high-intensity fine rolling screw-thread steel reinforcing bars that above-mentioned steps are obtained is：C：0.40%th, Mn：
0.80%th, Si：1.45%th, V：0.120%th, S：0.030%th, P：0.030%, balance of Fe.
Embodiment 2：
A kind of preparation technology of 930MPa high-intensity fine rollings screw-thread steel, using following operating procedure：
It is prepared by A steel billets：
(1) converter is slightly refined：By molten iron, (main component is C, Si, Mn, P, S, and remaining is Fe elements, and constituent content control will
Seek Si≤0.70%, P≤0.13%, S≤0.055%, other are without specific requirement) and steel scrap according to 9:1 weight turns than adding
Stove blows 13 minutes；Blowing is finished, and controls endpoint carbon content >=0.06%, outlet temperature≤1680 DEG C；Added in tapping process
Silicomangan and ferrovanadium nitride alloy element (element addition is adjusted accordingly according to C, Si, Mn actual content), it is ensured that eventually
Weight content≤0.35% of the C of point molten iron, weight content≤1.3% of Si, weight content≤0.70% of Mn；
(2) LF stoves refining：The molten steel that step (1) is tapped is hung to the refining of LF stoves, refining furnace uses carborundum and ferrosilicon powder
Carry out making white slag operation, slag to be refined carries out trimming operation again after adjusting to white, it is ensured that composition is all in the model of above-mentioned elemental composition
In enclosing；Refining time 50 minutes, 30 minutes white slag retention times, line feeding operation is carried out after completing refining operation by 1.9m/t.Protect
Card line outer soft blow time >=minute.Tapping temperature control is at 1565 DEG C when refining furnace is tapped；Carry out determining oxygen behaviour before refining furnace tapping
Make, by free Control for Oxygen Content within 12ppm；
(3) continuous small-billet casting：Step (2) is hung to cast station through the molten steel that LF stoves are refined.Continuous casting production uses plug
Rod bag is produced, and whole process protection cast, tundish temperature is controlled at 1525 DEG C, and casting speed control is in 1.6m/min, it is desirable to entirely draw steel
The fluctuation of process pulling speed of continuous casting is less than ± 0.01m/min, and liquid level fluctuation of crystallizer is less than ± 3mm；Small billet is casting continuously to form, according to difference
Rolling specs cut into the billet scaling of different length；
B is rolled：
The small billet cold charge that step A is poured into a mould is entered to heat stove heat, 1110 DEG C of furnace temperature of heating furnace, small billet is in heating furnace
1000 DEG C are heated to, rolling of being come out of the stove after heating 2 hours；Using whole process stream low temperature controlled rolling：The small billet come out of the stove feeding milling train is rolled
System, first carries out a de-scaling for removing the iron scale on small billet surface to steel billet, subsequently into roughing mill, 6 is rolled altogether
Passage, mill speed：1.75m/s；Rolling time 48s；Milling train in entering afterwards, rolls 4 passages, mill speed altogether：
4.32m/s；Rolling time 48s；Finishing mill is finally entered, 4 passages, mill speed are rolled altogether：8.50m/s；Rolling time
48s；
C is post-processed：
The Finished rolled steel that step B is rolled first is worn the cold mode of discontinuous control replied after water using three times and carried out at cooling
Reason, including controlled rolling and controlled cooling and recover section arrangement, design parameter and operation：
Recover section after first time Water cooling：Enter one 60 meters of recover sections after controlled rolling " 4 meters+4 meters " two Water coolings；The section
The temperature of Water cooling import is 820 DEG C, and hydraulic pressure control is 0.70MPa；
Recover section after second Water cooling：Enter after 4 meters of Water coolings of controlled rolling one 4 meters of recover sections enter back into one 4 meters it is extensive
Multiple section；This section of cooling water pressure≤0.60MPa of Water cooling；
Recover section after third time Water cooling：Enter after 2 meters of Water coolings of controlled rolling one 2 meters of recover sections enter back into one 4 meters it is extensive
Multiple section；This section of temperature of Water cooling import is 560 DEG C, and hydraulic pressure control is 0.22MPa.
Quickly supplied by roller-way after above-mentioned three Water coolings to cold bed, pinch roll ensures reinforcing bar poker during pinching
Velocity-stabilization, it is ensured that reinforcing bar poker velocity-stabilization, pinch process is pinched using automatic detection identification tail steel system；Then enter
Row 5# Double Dimension Flying Shears are segmented, overcome that former Double Dimension Flying Shears shear ability is not enough, on tail steel cold bed it is difficult, because tail steel transporting velocity fluctuates
Cause the problem of unstable properties；Cold bed tempering cooling, indoor stacking heap are carried out again cold 15 days, obtain final product a kind of 930MPa high intensity
Fining twisted steel.
The chemical composition of the 930MPa high-intensity fine rolling screw-thread steel reinforcing bars that above-mentioned steps are obtained is：C：0.50%th, Mn：
1.20%th, Si：1.85%th, V：0.220%th, S：0.010%th, P：0.020%, balance of Fe.
Embodiment 3：
A kind of preparation technology of 930MPa high-intensity fine rollings screw-thread steel, using following operating procedure：
It is prepared by A steel billets：
(1) converter is slightly refined：By molten iron, (main component is C, Si, Mn, P, S, and remaining is Fe elements, and constituent content control will
Seek Si≤0.70%, P≤0.13%, S≤0.055%, other are without specific requirement) and steel scrap according to 9:1 weight turns than adding
Stove blows 15 minutes；Blowing is finished, and controls endpoint carbon content >=0.06%, outlet temperature≤1680 DEG C；Added in tapping process
Silicomangan and ferrovanadium nitride alloy element (element addition is adjusted accordingly according to C, Si, Mn actual content), it is ensured that eventually
Weight content≤0.35% of the C of point molten iron, weight content≤1.3% of Si, weight content≤0.70% of Mn；
(2) LF stoves refining：The molten steel that step (1) is tapped is hung to the refining of LF stoves, refining furnace uses carborundum and ferrosilicon powder
Carry out making white slag operation, slag to be refined carries out trimming operation again after adjusting to white, it is ensured that composition is all in the model of above-mentioned elemental composition
In enclosing；Refining time 45 minutes, 25 minutes white slag retention times, line feeding operation is carried out after completing refining operation by 2.1m/t.Protect
Outer soft blow time >=15 minute of card line.Tapping temperature control is at 1560 DEG C when refining furnace is tapped；Carry out determining oxygen before refining furnace tapping
Operation, by free Control for Oxygen Content within 12ppm；
(3) continuous small-billet casting：Step (2) is hung to cast station through the molten steel that LF stoves are refined.Continuous casting production uses plug
Rod bag is produced, and whole process protection cast, tundish temperature is controlled at 1516 DEG C, and casting speed control is in 1.4m/min, it is desirable to entirely draw steel
The fluctuation of process pulling speed of continuous casting is less than ± 0.01m/min, and liquid level fluctuation of crystallizer is less than ± 3mm；Small billet is casting continuously to form, according to difference
Rolling specs cut into the billet scaling of different length；
B is rolled：
The small billet cold charge that step A is poured into a mould is entered to heat stove heat, 1050 DEG C of furnace temperature of heating furnace, small billet is in heating furnace
980 DEG C are heated to, rolling of being come out of the stove after heating 2.5 hours；Using whole process stream low temperature controlled rolling：The small billet come out of the stove feeding milling train is rolled
System, first carries out a de-scaling for removing the iron scale on small billet surface to steel billet, subsequently into roughing mill, 6 is rolled altogether
Passage, mill speed：1.04m/s；Rolling time 47s；Milling train in entering afterwards, rolls 4 passages, mill speed altogether：
3.36m/s；Rolling time 47s；Finishing mill is finally entered, 4 passages, mill speed are rolled altogether：7.0m/s；Rolling time 47s；
C is post-processed：
The Finished rolled steel that step B is rolled first is worn the cold mode of discontinuous control replied after water using three times and carried out at cooling
Reason, including controlled rolling and controlled cooling and recover section arrangement, design parameter and operation：
Recover section after first time Water cooling：Enter one 70 meters of recover sections after controlled rolling " 4 meters+4 meters " two Water coolings；The section
The temperature of Water cooling import is 780 DEG C, and hydraulic pressure control is 0.10MPa；
Recover section after second Water cooling：Enter after 4 meters of Water coolings of controlled rolling one 4 meters of recover sections enter back into one 4 meters it is extensive
Multiple section；This section of cooling water pressure≤0.60MPa of Water cooling；
Recover section after third time Water cooling：Enter after 2 meters of Water coolings of controlled rolling one 2 meters of recover sections enter back into one 4 meters it is extensive
Multiple section；This section of temperature of Water cooling import is 540 DEG C, and hydraulic pressure control is 0.18MPa.
Quickly supplied by roller-way after above-mentioned three Water coolings to cold bed, pinch roll ensures reinforcing bar poker during pinching
Velocity-stabilization, it is ensured that reinforcing bar poker velocity-stabilization, pinch process is pinched using automatic detection identification tail steel system；Then enter
Row 5# Double Dimension Flying Shears are segmented, overcome that former Double Dimension Flying Shears shear ability is not enough, on tail steel cold bed it is difficult, because tail steel transporting velocity fluctuates
Cause the problem of unstable properties；Cold bed tempering cooling, indoor stacking heap are carried out again cold 12 days, obtain final product a kind of 930MPa high intensity
Fining twisted steel.
The chemical composition of the 930MPa high-intensity fine rolling screw-thread steel reinforcing bars that above-mentioned steps are obtained is：C：0.47%th, Mn：
1.1%th, Si：1.63%th, V：0.170%th, S：0.022%th, P：0.016%, balance of Fe.
Embodiment 4
A kind of preparation technology of 930MPa high-intensity fine rollings screw-thread steel, using following operating procedure：
It is prepared by A steel billets：
(1) converter is slightly refined：By molten iron, (main component is C, Si, Mn, P, S, and remaining is Fe elements, and constituent content control will
Seek Si≤0.70%, P≤0.13%, S≤0.055%, other are without specific requirement) and steel scrap according to 9:1 weight turns than adding
Stove blows 14 minutes；Blowing is finished, and controls endpoint carbon content >=0.06%, outlet temperature≤1680 DEG C；Added in tapping process
Silicomangan and ferrovanadium nitride alloy element (element addition is adjusted accordingly according to C, Si, Mn actual content), it is ensured that eventually
Weight content≤0.35% of the C of point molten iron, weight content≤1.3% of Si, weight content≤0.70% of Mn；
(2) LF stoves refining：The molten steel that step (1) is tapped is hung to the refining of LF stoves, refining furnace uses carborundum and ferrosilicon powder
Carry out making white slag operation, slag to be refined carries out trimming operation again after adjusting to white, it is ensured that composition is all in the model of above-mentioned elemental composition
In enclosing；Refining time 40 minutes, 35 minutes white slag retention times, line feeding operation is carried out after completing refining operation by 2m/t.Ensure
Outer soft blow time >=15 minute of line.Tapping temperature control is at 1562 DEG C when refining furnace is tapped；Carry out determining oxygen behaviour before refining furnace tapping
Make, by free Control for Oxygen Content within 12ppm；
(3) continuous small-billet casting：Step (2) is hung to cast station through the molten steel that LF stoves are refined.Continuous casting production uses plug
Rod bag is produced, and whole process protection cast, tundish temperature is controlled at 1510 DEG C, and casting speed control is in 1.5m/min, it is desirable to entirely draw steel
The fluctuation of process pulling speed of continuous casting is less than ± 0.01m/min, and liquid level fluctuation of crystallizer is less than ± 3mm；Small billet is casting continuously to form, according to difference
Rolling specs cut into the billet scaling of different length；
B is rolled：
The small billet cold charge that step A is poured into a mould is entered to heat stove heat, 1100 DEG C of furnace temperature of heating furnace, small billet is in heating furnace
970 DEG C are heated to, rolling of being come out of the stove after heating 3 hours；Using whole process stream low temperature controlled rolling：The small billet come out of the stove feeding milling train is rolled
System, first carries out a de-scaling for removing the iron scale on small billet surface to steel billet, subsequently into roughing mill, 6 is rolled altogether
Passage, mill speed：1.34m/s；Rolling time 46s；Milling train in entering afterwards, rolls 4 passages, mill speed altogether：3.5m/
s；Rolling time 47s；Finishing mill is finally entered, 4 passages, mill speed are rolled altogether：6.50m/s；Rolling time 48s；
C is post-processed：
The Finished rolled steel that step B is rolled first is worn the cold mode of discontinuous control replied after water using three times and carried out at cooling
Reason, including controlled rolling and controlled cooling and recover section arrangement, design parameter and operation：
Recover section after first time Water cooling：Enter one 80 meters of recover sections after controlled rolling " 4 meters+4 meters " two Water coolings；The section
The temperature of Water cooling import is 810 DEG C, and hydraulic pressure control is 0.60MPa；
Recover section after second Water cooling：Enter after 4 meters of Water coolings of controlled rolling one 4 meters of recover sections enter back into one 4 meters it is extensive
Multiple section；This section of cooling water pressure≤0.60MPa of Water cooling；
Recover section after third time Water cooling：Enter after 2 meters of Water coolings of controlled rolling one 2 meters of recover sections enter back into one 4 meters it is extensive
Multiple section；This section of temperature of Water cooling import is 545 DEG C, and hydraulic pressure control is 0.22MPa.
Quickly supplied by roller-way after above-mentioned three Water coolings to cold bed, pinch roll ensures reinforcing bar poker during pinching
Velocity-stabilization, it is ensured that reinforcing bar poker velocity-stabilization, pinch process is pinched using automatic detection identification tail steel system；Then enter
Row 5# Double Dimension Flying Shears are segmented, overcome that former Double Dimension Flying Shears shear ability is not enough, on tail steel cold bed it is difficult, because tail steel transporting velocity fluctuates
Cause the problem of unstable properties；Cold bed tempering cooling, indoor stacking heap are carried out again cold 10 days, obtain final product a kind of 930MPa high intensity
Fining twisted steel.
The chemical composition of the 930MPa high-intensity fine rolling screw-thread steel reinforcing bars that above-mentioned steps are obtained is：C：0.41%th, Mn：
0.97%th, Si：1.59%th, V：0.180%th, S：0.024%th, P：0.019%, balance of Fe.
Embodiment 5
A kind of preparation technology of 930MPa high-intensity fine rollings screw-thread steel, using following operating procedure：
It is prepared by A steel billets：
(1) converter is slightly refined：By molten iron, (main component is C, Si, Mn, P, S, and remaining is Fe elements, and constituent content control will
Seek Si≤0.70%, P≤0.13%, S≤0.055%, other are without specific requirement) and steel scrap according to 9:1 weight turns than adding
Stove blows 15 minutes；Blowing is finished, and controls endpoint carbon content >=0.06%, outlet temperature≤1680 DEG C；Added in tapping process
Silicomangan and ferrovanadium nitride alloy element (element addition is adjusted accordingly according to C, Si, Mn actual content), it is ensured that eventually
Weight content≤0.35% of the C of point molten iron, weight content≤1.3% of Si, weight content≤0.70% of Mn；
(2) LF stoves refining：The molten steel that step (1) is tapped is hung to the refining of LF stoves, refining furnace uses carborundum and ferrosilicon powder
Carry out making white slag operation, slag to be refined carries out trimming operation again after adjusting to white, it is ensured that composition is all in the model of above-mentioned elemental composition
In enclosing；It is required that refining time 35 minutes, 20 minutes white slag retention times, line feeding behaviour is carried out after completing refining operation by 1.9m/t
Make.Ensure outer soft blow time >=15 minute of line.Tapping temperature control is at 1558 DEG C when refining furnace is tapped；Carried out before refining furnace tapping
Oxygen operation is determined, by free Control for Oxygen Content within 12ppm；
(3) continuous small-billet casting：Step (2) is hung to cast station through the molten steel that LF stoves are refined.Continuous casting production uses plug
Rod bag is produced, and whole process protection cast, tundish temperature is controlled at 1510 DEG C, and casting speed control is in 1.45m/min, it is desirable to entirely draw steel
The fluctuation of process pulling speed of continuous casting is less than ± 0.01m/min, and liquid level fluctuation of crystallizer is less than ± 3mm；Small billet is casting continuously to form, according to difference
Rolling specs cut into the billet scaling of different length；
B is rolled：
The small billet cold charge that step A is poured into a mould is entered to heat stove heat, 1090 DEG C of furnace temperature of heating furnace, small billet is in heating furnace
990 DEG C are heated to, rolling of being come out of the stove after 2.5 hours heat times；Using whole process stream low temperature controlled rolling：The small billet come out of the stove feeding is rolled
Machine is rolled, and a de-scaling is first carried out to steel billet for removing the iron scale on small billet surface, subsequently into roughing mill, rolling altogether
6 passages, mill speed：1.58m/s；Rolling time 47s；Milling train in entering afterwards, rolls 4 passages, mill speed altogether：
2.9m/s；Rolling time 47s；Finishing mill is finally entered, 4 passages, mill speed are rolled altogether：7.50m/s；Rolling time 46s；
C is post-processed：
The Finished rolled steel that step B is rolled first is worn the cold mode of discontinuous control replied after water using three times and carried out at cooling
Reason, including controlled rolling and controlled cooling and recover section arrangement, design parameter and operation：
Recover section after first time Water cooling：Enter one 80 meters of recover sections after controlled rolling " 4 meters+4 meters " two Water coolings；The section
The temperature of Water cooling import is 790 DEG C, and hydraulic pressure control is 0.50MPa；
Recover section after second Water cooling：Enter after 4 meters of Water coolings of controlled rolling one 4 meters of recover sections enter back into one 4 meters it is extensive
Multiple section；This section of cooling water pressure≤0.60MPa of Water cooling；
Recover section after third time Water cooling：Enter after 2 meters of Water coolings of controlled rolling one 2 meters of recover sections enter back into one 4 meters it is extensive
Multiple section；This section of temperature of Water cooling import is 555 DEG C, and hydraulic pressure control is 0.19MPa.
Quickly supplied by roller-way after above-mentioned three Water coolings to cold bed, pinch roll ensures reinforcing bar poker during pinching
Velocity-stabilization, it is ensured that reinforcing bar poker velocity-stabilization, pinch process is pinched using automatic detection identification tail steel system；Then enter
Row 5# Double Dimension Flying Shears are segmented, overcome that former Double Dimension Flying Shears shear ability is not enough, on tail steel cold bed it is difficult, because tail steel transporting velocity fluctuates
Cause the problem of unstable properties；Cold bed tempering cooling, indoor stacking heap are carried out again cold 9 days, obtain final product a kind of 930MPa high intensity
Fining twisted steel.
The chemical composition of the 930MPa high-intensity fine rolling screw-thread steel reinforcing bars that above-mentioned steps are obtained is：C：0.43%th, Mn：
1.17%th, Si：1.74%th, V：0.210%th, S：0.017%th, P：0.025%, balance of Fe.
Claims (5)
1. a kind of preparation technology of 930MPa high-intensity fine rollings screw-thread steel, it is characterized in that：Including following operating procedure：
It is prepared by A steel billets：
(1) converter is slightly refined：
Molten iron：Chemical composition is C, Si, Mn, P, S, and remaining is Fe elements, and constituent content control requires Si≤0.70%, P≤
0.13%, S≤0.055%, other are without specific requirement；
By above-mentioned molten iron and steel scrap according to 9:1 weight blow in converter than being added, blowing finish control endpoint carbon content >=
0.06%, outlet temperature≤1680 DEG C；Silicomangan and ferrovanadium nitride alloy element are added in tapping process, it is ensured that the C of molten iron
Weight content≤0.35%, weight content≤1.3% of Si, weight content≤0.70% of Mn；
(2) LF stoves refining：The molten steel that step (1) is tapped is hung to the refining of LF stoves, refining furnace carries out making white slag operation, refining time
>=30 minutes, white slag retention time >=20 minute carried out line feeding operation, it is ensured that outside line after completing refining operation by 1.9-2.1m/t
Soft blow time >=15 minute；Refining furnace tapping temperature is controlled at 1555 DEG C -1565 DEG C；Carry out determining oxygen operation before refining furnace tapping,
By free Control for Oxygen Content within 12ppm；
(3) continuous small-billet casting：Step (2) is hung to cast station through the molten steel that LF stoves are refined, continuous casting production uses stopper bag
Production, whole process protection cast, tundish temperature control at 1505 DEG C -1525 DEG C, casting speed control in 1.3m/min-1.6m/min,
It is required that entirely drawing steel process pulling speed of continuous casting fluctuation range ± 0.01m/min, liquid level fluctuation of crystallizer scope ± 3mm；It is casting continuously to form small
Square billet, the billet scaling of different length is cut into according to different rolling specs；
B is rolled：
The small billet cold charge that step A is poured into a mould is entered to heat stove heat, 1080 ± 30 DEG C of furnace temperature of heating furnace, small billet is in heating furnace
960-1000 DEG C is heated to, rolling of being come out of the stove behind heat time >=1.5 hour；Using whole process stream low temperature controlled rolling：By the small side for coming out of the stove
Base sends into mill milling, a de-scaling is first carried out to steel billet for removing the iron scale on small billet surface, subsequently into roughing
Machine, rolls 6 passages, mill speed altogether：0.34m/s-1.75m/s；Rolling time 46-48s；Milling train in entering afterwards, rolls altogether
4 passages of system, mill speed：2.40m/s-4.32m/s；Rolling time 46-48s；Finishing mill is finally entered, 4 roads are rolled altogether
It is secondary, mill speed：5.50m/s-8.50m/s；Rolling time 46-48s；
Using the finish rolling hole of " elliptical aperture+K1 finished holes of the K4 elliptical aperture+K3 edging pass for rolling+K2 with bottom land convexity " in step B rollings
Type system carries out finish rolling；
C is post-processed：
By step B roll Finished rolled steel carry out cooling treatment by the way of discontinuous control is cold, after cooling by roller-way supply to
Cold bed, then Double Dimension Flying Shears segmentation, cold bed tempering cooling, indoor stacking heap are cold, obtain final product；
The segmentation of step C Double Dimension Flying Shears is using " 5# flying shears " segmentation；
Discontinuous control described in step C is cold cold first to wear the discontinuous control that recovers after water；
930MPa high-intensity fine rolling screw-thread steels obtained by above-mentioned steps, are made up of the composition of following percentage by weight：C：0.40-
0.50%th, Mn：0.80-1.20%, Si：1.45-1.85%, V：0.120-0.220%, S≤0.030%, P≤0.030%, it is remaining
It is Fe to measure.
2. the preparation technology of a kind of 930MPa high-intensity fine rollings screw-thread steel according to claim 1, it is characterized in that：Step C
The cold controlled rolling and controlled cooling set gradually including several of discontinuous control and recover section.
3. the preparation technology of a kind of 930MPa high-intensity fine rollings screw-thread steel according to claim 1, it is characterized in that：Step C
It is that first to wear the discontinuous control recovered after water three times cold that the discontinuous control is cold.
4. the preparation technology of a kind of 930MPa high-intensity fine rollings screw-thread steel according to claim 3, it is characterized in that：Described three
It is secondary first to wear that the discontinuous control recovered after water is cold to be：
Recover section after first time Water cooling：Enter " 60-80 meters " recover section after controlled rolling " 4 meters+4 meters " two Water coolings；Should
The temperature of section Water cooling import is 800 ± 20 DEG C, and hydraulic pressure control is 0.40 ± 0.30MPa；
Recover section after second Water cooling：After 4 meters of Water coolings of controlled rolling one 4 meters of recover sections are entered back into one 4 meters of recover sections；
This section of cooling water pressure≤0.60MPa of Water cooling；
Recover section after third time Water cooling：After 2 meters of Water coolings of controlled rolling one 4 meters of recover sections are entered back into one 2 meters of recover sections；
This section of temperature of Water cooling import is 550 ± 10 DEG C, and hydraulic pressure control is 0.20 ± 0.02MPa.
5. the preparation technology of a kind of 930MPa high-intensity fine rollings screw-thread steel according to claim 1, it is characterized in that：Step C
Cold bed temperature is 650-670 DEG C.
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| CN106350733A (en) * | 2016-09-19 | 2017-01-25 | 石横特钢集团有限公司 | PSB1080 finish-rolled threaded bar and production process thereof |
| CN108526217A (en) * | 2018-05-14 | 2018-09-14 | 盐城市联鑫钢铁有限公司 | A kind of process and equipment improving rebar surface corrosion resistance |
| CN109731911B (en) * | 2019-01-30 | 2020-07-17 | 福建泉州闽光钢铁有限责任公司 | Method for improving performance of head of twisted steel wire rod |
| CN109778067B (en) * | 2019-02-18 | 2020-07-31 | 西南交通大学 | Preparation method of sleeper elastic strip |
| CN112126735A (en) * | 2020-09-15 | 2020-12-25 | 石横特钢集团有限公司 | Production process of high-strength finish-rolled threaded steel billet |
| CN112322985A (en) * | 2020-11-18 | 2021-02-05 | 江苏永钢集团有限公司 | Annealing-free PSB830 finish-rolled deformed steel bar and production process thereof |
| CN114564867A (en) * | 2022-03-04 | 2022-05-31 | 广州众山精密科技有限公司 | Hole pattern design method based on minimum resistance law |
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Denomination of invention: A 930MPa high-strength precision rolled threaded steel and its preparation process Effective date of registration: 20231222 Granted publication date: 20170704 Pledgee: Industrial and Commercial Bank of China Limited Feicheng sub branch Pledgor: SHIHENG SPECIAL STEEL GROUP Co.,Ltd. Registration number: Y2023980073806 |
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