CN104018070B - Production method of flaw detection guaranteed thick S355J2 steel plate - Google Patents
Production method of flaw detection guaranteed thick S355J2 steel plate Download PDFInfo
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Abstract
The invention discloses a flaw detection guaranteed thick S355J2 borated steel plate and a production method thereof. The flaw detection guaranteed thick S355J2 borated steel plate comprises the following chemical components by weight percent: 0.17-0.19% of C, 0.35-0.45% of Si, 1.45-1.6% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.025-0.035% of V, 0.0015-0.003% of Ca, 0.017-0.03% of Als, and the balance of iron and impurities. The invention also discloses a production method of the flaw detection guaranteed thick S355J2 borated steel plate. The flaw detection guaranteed thick S355J2 borated steel plate is made of low cost components, is added with trace V based on the conventional C-Mn steel, is prepared through proper heating, controlled rolling, controlled cooling and normalizing, and has good surface quality.
Description
Technical field
This counterweight is related to a kind of material technology, specifically, is related to the producer that a kind of think gauge protects flaw detection s355j2 steel plate
Method.
Background technology
S355j2 steel grade requires there is higher intensity and toughness, and this steel grade is widely used in each in the manufacturing
Field, with manufacturing development, more and more thicker to the thickness requirement of s355j2 steel plate, steel plate also needs to detect a flaw meet and wants simultaneously
Ask.Thicken with steel plate thickness, during rolling, compression ratio reduces, the flaw detection qualification rate of steel plate typically can decline.S355j2 steel plate
Produced using Europe superscript, the steel plate of production is used for exporting, outlet steel plate typically will add boron or in surface mopping, table steel plate
Face mopping can lead to complex process, high cost；And add boron steel and crackle easily occurs, thick steel plates are little due to compression ratio, occur
The probability of crackle is bigger.The guarantor flaw detection s355j2 of therefore think gauge adds boron steel and is difficult to produce in enormous quantities.
Chinese publication number cn 101654760a discloses a kind of non-alloy structures steel s355j2 steel plate and its production method.
The armor plate strength producing in this way and toughness all meet standard and require.But the method is not suitable for more than 80mm thickness specification
Plate Production, and composition not boracic (b).
Chinese publication number cn 102345060 a discloses one kind no face crack s355j2 and adds boron plate and its producer
Method.The armor plate strength producing in this way and toughness all meet standard and require, and surface of steel plate flawless can protect three-level flaw detection.But
Can the method requires to roll steel plate and enter burial pit stacking slow cooling, high to subsequent technique condition and equipment requirements, to meeting three-level
Above flaw detection is not discussed, and with the addition of nb, ti in steel simultaneously, and cost of alloy is high.
Content of the invention
Technical problem solved by the invention is the production method providing a kind of think gauge to protect flaw detection s355j2 steel plate, passes through
Suitable heating, controlled rolling, control are cold, normalizing process has just obtained the good think gauge of surface quality and protected s355j2 steel plate of detecting a flaw.
A kind of think gauge protects the production method of flaw detection s355j2 steel plate, and including smelting, continuous casting, slab heats again, steel plate rolls
The step making type, section cooling, stacking slow cooling and normalized treatment, wherein,
In smelting and casting process, molten iron adopts Mg-basic desulphuration, adopts top bottom blowing in converter；Molten steel is through lf stove essence
Refine s≤0.003% it is desirable in molten steel；Molten steel carries out rh stove process, is less than process time under 133pa in vacuum not low
In 30 minutes；The thickness of continuous casting billet is 250mm, adopts electromagnetic agitation and slighter compress during continuous casting, and electromagnetic agitation frequency is 6hz, electricity
Stream 280a, depressing position is 6,7,8 sections, and drafts is 2mm, 2mm, 2mm；
Slab, again in heating process, is produced using the thick continuous casting billet of 250mm, then tapping temperature 1180- heating
1210 DEG C, 270～410 minutes heat time heating times；
In steel plate rolling forming process, first stage open rolling thickness is slab thickness, first stage start rolling temperature 1170～
1200 DEG C, single pass reduction ratio >=10% when first stage high temperature extends rolling, roll 3～5 passages；Second stage steel plate
Open rolling thickness is 1.3～2 times of finished steel plate thickness, and second stage steel plate start rolling temperature is 860～890 DEG C, second stage finish to gauge
Temperature is 820～850 DEG C, rolls 4～6 passages, at least a time reduction ratio >=11%；
In laminar cooling process, rate of cooling is 5～8 DEG C/s, and final cooling temperature is 640～690 DEG C；Stacking slow cooling process
In it is desirable to steel plate stacking slow cooling temperature be more than 200 DEG C；
During normalized treatment, the temperature of normalizing is 870 DEG C, and is incubated 20 minutes at 870 DEG C.Normalizing adopts certainly after coming out of the stove
So air cooling mode cools down；
The thickness that finished product think gauge protects flaw detection s355j2 steel plate is 50mm～100mm, and its chemical composition is by weight percentage
Meter, comprising: c 0.17～0.19%, si 0.35～0.45%, mn 1.45～1.6%, p≤0.02%, s≤0.005%, v
0.025～0.035%, ca 0.0015～0.003%, als 0.017～0.03%, remaining is ferrum and impurity.
Further: slab tapping temperature is 1180 DEG C, slab heating time is 270 minutes, first stage start rolling temperature
1170 DEG C, first stage high temperature extends the minimum single pass reduction ratio 12% of rolling, second stage open rolling thickness 108mm, second-order
880 DEG C of start rolling temperature of section, 850 DEG C of second stage finishing temperature, 6 DEG C/s of rate of cooling, 640 DEG C of final cooling temperature, normalizing temperature 870
℃；Finished steel plate thickness is 60mm, and its chemical composition is by weight percentage, comprising: c 0.17%, si 0.35%, mn
1.45%th, p 0.02%, s 0.003%, v 0.025%, als 0.017%, ca 0.0015%, balance of fe and impurity.
Further: slab tapping temperature is 1210 DEG C, slab heating time is 410 minutes, first stage start rolling temperature
1200 DEG C, first stage high temperature extends the minimum single pass reduction ratio 10% of rolling, second stage open rolling thickness 130mm, second-order
860 DEG C of start rolling temperature of section, 832 DEG C of second stage finishing temperature, 5 DEG C/s of rate of cooling, 658 DEG C of final cooling temperature, normalizing temperature 870
℃；Finished steel plate thickness is 100mm, and its chemical composition is by weight percentage, comprising: c 0.19%, si 0.45%, mn
1.55%th, p 0.012%, s 0.005%, v 0.035%, als 0.026%, ca 0.002%, balance of fe and impurity.
Compared with prior art, this counterweight technique effect includes:
1st, the present invention, using inexpensive composition design, only adds micro v, by suitable on the basis of traditional c-mn steel
Heating, controlled rolling, the cold, normalizing process of control just obtained the good think gauge of surface quality and protected flaw detection s355j2 steel plate.
2nd, the intensity of steel plate, plasticity, toughness are good.Between 360mpa～430mpa, tensile strength exists the intensity of steel plate
Between 540～600mpa, between 24%～32%, -20 DEG C of ballistic works are between 140j～200j for elongation percentage.
3rd, the flaw detection qualification rate of steel plate is high.The one-level flaw detection qualification rate of steel plate reaches 99.96%.
4th, rationally, process system is more relaxed for the composition of steel plate and technological design, can on generous printed line steady production.
5th, 1.5 ten thousand tons of this s355j2 steel plate of 50mm～100mm, 200 yuan of calculating of profit per ton were produced with 1 year.Can increase within 1 year
Plus 3,000,000 yuan of profit, there is good economic benefit.This plate surface quality is good, need not operation reconditioning below, be easy to plus
Work, has good social benefit.
Brief description
Fig. 1 is the metallographic structure figure of the steel plate of the embodiment of the present invention 1；
Fig. 2 is the metallographic structure figure of the steel plate of the embodiment of the present invention 2；
Fig. 3 is the metallographic structure figure of the steel plate of the embodiment of the present invention 3.
Specific embodiment
Only on the basis of traditional c-mn steel, add micro v, by suitable heating, controlled rolling, just control cold, normalizing process
Obtain the good think gauge of surface quality and protect flaw detection s355j2 steel plate.Solve the s355j2 surface of steel plate of common process production
The problem of severe crack.
Think gauge protects the production method of flaw detection s355j2 steel plate, specifically comprises the following steps that
Step 1: smelt and continuous casting；
(1) molten iron adopts Mg-basic desulphuration, adopts top bottom blowing in converter；
(2) molten steel through lf stove refine it is desirable to s≤0.003% in molten steel；
(3) molten steel carries out rh stove process, is less than process time under 133pa in vacuum and is not less than 30 minutes.
(4) thickness of continuous casting billet is 250mm, adopts electromagnetic agitation and slighter compress during continuous casting, and electromagnetic agitation frequency is 6hz,
Electric current 280a, depressing position is 6,7,8 sections, and drafts is 2mm, 2mm, 2mm.During continuous casting using electromagnetic agitation and slighter compress be for
Improve the proportion of equiaxed grain of slab, reduce center segregation, improve slab internal soundness.
Step 2: slab heats again；
For ensureing certain compression ratio and slab quality, from the continuous casting billet that 250mm is thick.Using the continuous casting billet that 250mm is thick
Produced, tapping temperature 1180-1210 DEG C that continuous casting billet (slab) heats again, 270～410 minutes heat time heating times.
Step 3: steel plate rolling molding；
Slab add heat again after be controlled roll, first stage open rolling thickness be slab thickness, first stage open rolling
1170～1200 DEG C of temperature, single pass reduction ratio >=10% when first stage (roughing) high temperature extends rolling, roll 3～5 roads
Secondary；The open rolling thickness of second stage (finish rolling) steel plate is 1.3～2 times of finished steel plate thickness, and second stage steel plate start rolling temperature is
860～890 DEG C, second stage finishing temperature is 820～850 DEG C, 4～6 passages of rolling, at least a time reduction ratio >=
11%.
The above-mentioned continuous casting billet heating is controlled rolling in austenite recrystallization area.First stage controlled rolling belongs to
The austenite recrystallization controlled rolling of high-temperature region, this stage adopts low speed, the rolling strategy of big pressure.Big single pass pressure
Rate can make deformation fully infiltrate into steel plate center, abundant fining austenite grains homogeneous austenite structure, and rolling simultaneously produces
High temperature seam effect largely eliminate the defects such as loose, micro-crack within strand, so that the consistency of steel plate is improved；
Low speed rolling makes the complete temperature of each passes be less than temperature during upper a time rolling, due to crystal grain after steel plate recrystallization
Depend mainly on the size of temperature at that time, so often rolling a time will be refined in various degree to crystal grain, is finally reached
The purpose of abundant fining austenite grains；When also having rolling, mill speed is low, and resistance of deformation is little, easily realizes larger single pass
Reduction ratio.
Chemical composition due to this steel grade does not contain nb etc., separates out Section 2 grain when can roll under second stage higher temperature
The alloying element of son, the therefore rolling of second stage mainly or recrystallize controlled rolling.After first stage controlled rolling terminates, middle
Base swings cooling on roller-way, and cooling method is natural air cooling, is cooled to second stage start rolling temperature and starts to roll, second stage
During rolling, austenite crystal is crushed repeatedly, recrystallization softening, and such austenite crystal is finally rolling refined in the first stage
On the basis of, it is further refined again, and after being rolled due to second stage, finishing temperature is relatively low, and austenite crystal is substantially no longer
Grow up, finally give tiny austenite crystal.Austenite crystal is more tiny, and its grain boundary area is bigger, from austenite to ferrum element
Nucleation site when body changes is more, and nucleation rate is higher, and the ferrite crystal grain finally giving is more tiny, the intensity of steel plate
Higher, impact flexibility is better.
Step 4: steel plate carries out section cooling after rolling, rate of cooling is 5～8 DEG C/s, and final cooling temperature is 640～690 DEG C.
Adopt section cooling after rolling, steel plate is quickly cooled to 640～690 DEG C by finishing temperature, reduce further Austria
Family name's body, to ferritic transition temperature, has refined ferrite crystal grain further, is that heat treatment gets out good steel plate tissue.
Step 5: stacking slow cooling；
After steel plate rolls, offline immediately need to carry out stacking slow cooling it is desirable to the stacking slow cooling temperature of steel plate is more than 200 DEG C.
Step 6: roll rear steel plate and carry out normalized treatment.
The temperature of normalizing is 870 DEG C, and is incubated 20 minutes at 870 DEG C.Normalizing is cooled down using natural air cooling mode after coming out of the stove.
The thickness that finished product think gauge protects flaw detection s355j2 steel plate is 50mm～100mm.Its chemical composition is by weight percentage
Meter, comprising: c 0.17～0.19%, si 0.35～0.45%, mn 1.45～1.6%, p≤0.02%, s≤0.005%, v
0.025～0.035%, ca 0.0015～0.003%, als (dissolved aluminum) 0.017～0.03%, remaining is ferrum and inevitable
Impurity.
Because the compression ratio of steel plate is little, and roll steel plate center portion during cooling and differ larger with surface temperature, lead to steel plate
Through-thickness histological difference is big, cold to controlled rolling, control after steel plate carry out heat treatment can uniform steel sheet further tissue, improve
Plate property.
The normalizing temperature of steel plate and normalizing time are defined by obtaining tiny, uniform austenite crystal, and normalizing temperature is too high,
Then austenite crystal is thick, affects plate property；Normalizing temperature is too low, then austenite crystal is uneven, mixed crystal phenomenon, shadow
Ring the performance uniformity of steel plate.
The invention will be further described with reference to embodiments.
Embodiment 1
It is 250mm slab using thickness, slab tapping temperature is 1180 DEG C, slab heating time is 270 minutes, slab
(percentage by weight) chemical composition is: c 0.17%, si 0.35%, mn 1.45%, p 0.02%, s 0.003%, v
0.025%th, als 0.017%, ca 0.0015%, balance of fe and inevitable impurity.It is rolled into the steel that thickness is 60mm
Plate, detailed rolling and cold go technique to be shown in Table 1, its mechanical property is shown in Table 2.Steel plate meets one-level flaw detection and requires.
As shown in figure 1, the metallographic structure figure for the steel plate of embodiment 1 in the present invention.Can be seen that steel plate from this metallograph
Be organized as ferrite+pearlite, ferrite is in the great majority, and uniform small grains do not have mixed crystal phenomenon.Because ferrite accounts for greatly
Most, crystal grain is tiny, and ferrite has good plasticity, toughness, and the steel plate of therefore this tissue has good toughness and relatively
High intensity.
Table 1 rolls and cooling technique
Table 2 mechanical property of steel plate
Embodiment 2
It is 250mm slab using thickness, slab tapping temperature is 1210 DEG C, slab heating time is 410 minutes, slab
(percentage by weight) chemical composition is: c 0.19%, si 0.45%, mn 1.55%, p 0.012%, s 0.005%, v
0.035%th, als 0.026%, ca 0.002%, balance of fe and inevitable impurity.It is rolled into the steel that thickness is 100mm
Plate, detailed rolling and cold go technique to be shown in Table 3, its mechanical property is shown in Table 4.Steel plate meets one-level flaw detection and requires.
As shown in Fig. 2 the metallographic structure figure for the steel plate of embodiment 2 in the present invention.Can be seen that steel plate from this metallograph
Be organized as ferrite+pearlite, ferrite is in the great majority, and uniform small grains do not have mixed crystal phenomenon.Because ferrite accounts for greatly
Most, crystal grain is tiny, and ferrite has good plasticity, toughness, and the steel plate of therefore this tissue has good toughness and relatively
High intensity.
Table 3 rolls and cooling technique
Table 4 mechanical property of steel plate
Embodiment 3
It is 250mm slab using thickness, slab tapping temperature is 1202 DEG C, slab heating time is 373 minutes, slab
(percentage by weight) chemical composition is: c 0.18%, si 0.45%, mn 1.6%, p 0.007%, s 0.002%, v
0.029%th, als 0.03%, ca 0.003%, balance of fe and inevitable impurity.It is rolled into the steel that thickness is 50mm
Plate, detailed rolling and cold go technique to be shown in Table 5, its mechanical property is shown in Table 6.Steel plate meets one-level flaw detection and requires.
As shown in figure 3, the metallographic structure figure for the steel plate of embodiment 3 in the present invention.Can be seen that steel plate from this metallograph
Be organized as ferrite+pearlite, ferrite is in the great majority, and uniform small grains do not have mixed crystal phenomenon.Because ferrite accounts for greatly
Most, crystal grain is tiny, and ferrite has good plasticity, toughness, and the steel plate of therefore this tissue has good toughness and relatively
High intensity.
Table 5 rolls and cooling technique
Table 6 mechanical property of steel plate
Claims (3)
1. a kind of think gauge protect flaw detection s355j2 steel plate production method it is characterised in that: include smelting, continuous casting, slab add again
Heat, steel plate rolling molding, the step of section cooling, stacking slow cooling and normalized treatment, wherein,
In smelting and casting process, molten iron adopts Mg-basic desulphuration, adopts top bottom blowing in converter；Molten steel through lf stove refine,
Require s≤0.003% in molten steel；Molten steel carries out rh stove process, is less than process time under 133pa in vacuum and is not less than 30
Minute；The thickness of continuous casting billet is 250mm, adopts electromagnetic agitation and slighter compress during continuous casting, and electromagnetic agitation frequency is 6hz, electric current
280a, depressing position is 6,7,8 sections, and drafts is respectively 2mm, 2mm, 2mm；
Slab, again in heating process, is produced using the thick continuous casting billet of 250mm, then tapping temperature 1180-1210 DEG C heating,
270～410 minutes heat time heating times；
In steel plate rolling forming process, first stage open rolling thickness is slab thickness, first stage start rolling temperature 1170～1200
DEG C, single pass reduction ratio >=10% when first stage high temperature extends rolling, roll 3～5 passages；The open rolling of second stage steel plate
Thickness is 1.3～2 times of finished steel plate thickness, and second stage steel plate start rolling temperature is 860～890 DEG C, second stage finishing temperature
For 820～850 DEG C, roll 4～6 passages, at least a time reduction ratio >=11%；
In laminar cooling process, rate of cooling is 5～8 DEG C/s, and final cooling temperature is 640～690 DEG C；During stacking slow cooling,
The stacking slow cooling temperature seeking steel plate is more than 200 DEG C；
During normalized treatment, the temperature of normalizing is 870 DEG C, and is incubated 20 minutes at 870 DEG C, and normalizing is empty using nature after coming out of the stove
Cold mode cools down；
The thickness that finished product think gauge protects flaw detection s355j2 steel plate is 50mm～100mm, and its chemical composition by weight percentage, is wrapped
Include: c 0.17～0.19%, si 0.35～0.45%, mn 1.45～1.6%, p≤0.02%, s≤0.005%, v 0.025
～0.035%, ca 0.0015～0.003%, als 0.017～0.03%, remaining is ferrum and impurity.
2. think gauge as claimed in claim 1 protect flaw detection s355j2 steel plate production method it is characterised in that: slab tapping temperature
For 1180 DEG C, slab heating time is 270 minutes, 1170 DEG C of first stage start rolling temperature, and first stage high temperature extends rolling
Little single pass reduction ratio 12%, second stage open rolling thickness 108mm, 880 DEG C of second stage start rolling temperature, second stage finish to gauge temperature
850 DEG C of degree, 6 DEG C/s of rate of cooling, 640 DEG C of final cooling temperature, 870 DEG C of normalizing temperature；Finished steel plate thickness is 60mm, and its chemistry becomes
Divide by weight percentage, comprising: c 0.17%, si 0.35%, mn 1.45%, p 0.02%, s 0.003%, v
0.025%th, als 0.017%, ca 0.0015%, balance of fe and impurity.
3. think gauge as claimed in claim 1 protect flaw detection s355j2 steel plate production method it is characterised in that: slab tapping temperature
For 1210 DEG C, slab heating time is 410 minutes, 1200 DEG C of first stage start rolling temperature, and first stage high temperature extends rolling
Little single pass reduction ratio 10%, second stage open rolling thickness 130mm, 860 DEG C of second stage start rolling temperature, second stage finish to gauge temperature
832 DEG C of degree, 5 DEG C/s of rate of cooling, 658 DEG C of final cooling temperature, 870 DEG C of normalizing temperature；Finished steel plate thickness is 100mm, its chemistry
Composition is by weight percentage, comprising: c 0.19%, si 0.45%, mn 1.55%, p 0.012%, s 0.005%, v
0.035%th, als 0.026%, ca 0.002%, balance of fe and impurity.
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| CN106148817A (en) * | 2015-04-27 | 2016-11-23 | 鞍钢股份有限公司 | Production method of S355J2 wind power steel |
| CN115466830B (en) * | 2022-09-20 | 2024-03-22 | 包头钢铁（集团）有限责任公司 | Method for improving Q355ME wind power steel band structure |
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| JP2009114529A (en) * | 2007-11-08 | 2009-05-28 | Kobe Steel Ltd | METHOD FOR MANUFACTURING 550 MPa CLASS LOW YIELD RATIO STEEL SHEET HAVING SMALL DISPERSION OF QUALITY IN STEEL SHEET |
| JP5487682B2 (en) * | 2009-03-31 | 2014-05-07 | Ｊｆｅスチール株式会社 | High-toughness high-tensile steel plate with excellent strength-elongation balance and method for producing the same |
| CN101654760B (en) * | 2009-08-31 | 2010-09-22 | 南阳汉冶特钢有限公司 | Unalloyed structural steel S355J2 steel plate and production method thereof |
| CN101845587B (en) * | 2010-04-09 | 2011-11-23 | 武汉钢铁(集团)公司 | Steel with yield ratio no larger than 0.8 for hot rolling U-shaped steel sheet pile and production method thereof |
| CN102345060B (en) * | 2011-06-28 | 2014-07-30 | 南阳汉冶特钢有限公司 | S355J2 boron steel plate without surface crack and production method thereof |
| CN103602892B (en) * | 2013-10-22 | 2015-09-30 | 内蒙古包钢钢联股份有限公司 | The production method of thick steel plates |
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