CN101928882B - X60 pipe line steel and production method thereof - Google Patents
X60 pipe line steel and production method thereof Download PDFInfo
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- CN101928882B CN101928882B CN201010243229XA CN201010243229A CN101928882B CN 101928882 B CN101928882 B CN 101928882B CN 201010243229X A CN201010243229X A CN 201010243229XA CN 201010243229 A CN201010243229 A CN 201010243229A CN 101928882 B CN101928882 B CN 101928882B
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Abstract
The invention provides X60 pipe line steel and a preparation method thereof. The X60 pipe line steel comprises the following chemical components in percentage by weight: 0.060 to 0.080 percent of C, 0.15 to 0.30 percent of Si, 1.35 to 1.55 percent of Mn, less than or equal to 0.006 percent of S, less than or equal to 0.020 percent of P, 0.035 to 0.055 percent of Nb, 0.035 to 0.055 percent of V, 0.010 to 0.025 percent of Ti, less than or equal to 0.008 percent of N, 0.010 to 0.040 percent of Als, and the balance of Fe and inevitable impurities. After heating and descaling, rough rolling and finish rolling are continuously completed on the same steckel mill, the reinforcing effect of Nb, V and other microalloyed elements added in the steel can be sufficiently played by delay controlled rolling in the rolling process, micro-uniform tissues can be obtained, occurrence of mixed crystal can be effectively prevented, and the strength and toughness of the X60 pipe line steel can be greatly improved. The produced X60 pipe line steel belongs to the product with high technology content and high additional value, and has remarkable economic benefit.
Description
Technical field
The present invention relates to a kind of X60 pipe line steel and preparation method thereof, belong to metal material processing and field shaping technique.
Background technology
With the pipe-line transportation oil and gas have efficiently, characteristics such as economic, safe, pollution-free, be to carry the most effectively instrument of oil gas.In recent years,, driven increasing substantially of pipeline steel output, and made the production of pipeline steel be able to develop rapidly along with the develop rapidly of pipework.The X60 level pipeline pipeline steel is as pipework, the normal steels of branch line engineering particularly, and its production technology is greatly developed.The process method that enterprise adopted of domestic production X60 pipe line steel has nothing in common with each other at present.The semi continuous hot continuous rolling process that for example generally adopts, the CSP casting and rolling process that adopts in the patented claim 200810143635.1, and mention Heavy Plate Production technology and Steckel mill production technique in some other document.In the production process of using the rolling X60 pipe line steel of Steckel mill, generally adopt and on four rollers or duo mill, accomplish roughing earlier, be with steel to get into the single chassis Steckel mill again and accomplish finish rolling.But how on a two-shipper frame compact Steckel mill, accomplish continuously roughing, in roll and finish rolling, thereby the HS of producing, high ductility X 60/X pipe line steel, then beyond example can be reflected.
Summary of the invention
The present invention aims to provide a kind of HS, high ductility X 60/X pipe line steel, to meet the need of market.
Another object of the present invention is to provide a kind of and on a two-shipper frame compact Steckel mill, accomplish roughing and finish rolling continuously, thus the method for the HS of producing, high ductility X 60/X pipe line steel.
The Chemical Composition that HS provided by the invention, high ductility X 60/X pipe line steel have following weight ratio:
C：0.060～0.080wt％ Nb：0.035～0.055wt％
Si：0.15～0.30wt％ V：0.035～0.055wt％
Mn：1.35～1.55wt％ Ti：0.010～0.025wt％
Als：0.010～0.040wt％ S：≤0.006wt％
P：≤0.020wt％ N：≤0.008wt％
Surplus is Fe and inevitable impurity.
Preparing method's process the following step of HS provided by the invention, high ductility X 60/X pipe line steel:
A, slab that chemical ingredients is following:
C：0.060～0.080wt％ Nb：0.035～0.055wt％
Si：0.15～0.30wt％ V：0.035～0.055wt％
Mn：1.35～1.55wt％ Ti：0.010～0.025wt％
Als：0.010～0.040wt％ S：≤0.006wt％
P：≤0.020wt％ N：≤0.008wt％
Surplus is Fe and inevitable impurity,
Sending the soaking zone temperature is in 1200～1260 ℃ the process furnace, to heat 150～220 minutes, comes out of the stove:
B, to use pressure be that the high pressure water of 15～20MPa is to coming out of the stove 10～15 seconds of slab positive and negative water jet descaling;
C, send Steckel mill to be rolled the slab after the de-scaling, and the control start rolling temperature is 1080～1180 ℃, carries out the continuous roughing of 4 ~ 6 passages, open water coolant between passage simultaneously, the roughing steel plate;
D, with C step gained roughing steel plate time-delay 30 ~ 60 seconds, make the roughing steel billet temperature be lower than 900 ℃, carry out the continuous finish rolling of 3 passages, and open water coolant between passage, the control finishing temperature is 800～840 ℃, the finish rolling steel plate;
E, send reeling machine to batch D step gained finish rolling steel plate, and the control coiling temperature is 560～600 ℃, controls 20～25 ℃/s of laminar flow speed of cooling simultaneously, roll of steel plate;
F, with E step gained roll of steel plate natural air cooling to room temperature, promptly obtain HS, high ductility X 60/X pipe line steel.
The process furnace of said A step is a conventional equipment; Slab was controlled at 30～60 minutes in the time of process furnace soaking zone; Fully heavily molten to guarantee Nb, the V microalloy of separating out in the slab, refine austenite crystal grain is also separated out for cooling control after rolling and is prepared, with even slab interior tissue.
In the said D step roughing steel plate is delayed time; Be to let the roughing steel plate on the ground roller, back and forth move about 30 ~ 60 seconds; Carry out finish rolling afterwards again, and control finish rolling total deformation rate is greater than 40%, lets the slab generation relaxation after the continuous roughing gross distortion separate out; Obtain the roughed bloom of evenly tiny austenite structure, effectively prevent the generation of mixed crystal.
The road number of times of said C to D step, roll speed are looked the different size requirement and concrete are confirmed.
20～25 ℃/s of laminar flow speed of cooling of said E step; Be precipitation strength and solution strengthening in order to control microalloy; Reach the purpose of the pearlitic transformation pattern of control, size, quantity and distribution simultaneously through the control coiling temperature, have enough intensity and toughness to guarantee product.
The finish rolling of the roughing of said C step, D step is accomplished on same two-shipper frame compact Steckel mill of the prior art.
The slab of said A step is to utilize the method for making steel of prior art to obtain, and Nb wherein, V and other chemical element add in steelmaking process, control and obtain.
The present invention has the following advantages:
1, adopts the inventive method to produce the X60 pipe line steel, can give full play to the potentiality of two-shipper frame compact Steckel mill, make it on same two-shipper frame compact Steckel mill, to accomplish roughing and finish rolling continuously, expanded the strip range of product, optimized product structure.
2, adopt the time-delay rolling technology in the operation of rolling, made the strengthening effect that adds the Nb micro alloying element in the steel be not fully exerted, obtained fine uniform tissue, effectively prevented the appearance of mixed crystal, greatly improved the intensity and the toughness of X60 pipe line steel.
3, utilize the slab of Chemical Composition provided by the invention; The X60 pipe line steel that process process method of the present invention is produced; Characteristics with HS, H.T.; Over-all properties is good, and pipeline steel tube each item performance index of producing with X60 pipe line steel welding provided by the invention meet U.S. API standard, satisfy oil and gas and carry the requirement with steel pipe.
Embodiment
Below in conjunction with embodiment the present invention is done and to further describe.
Embodiment 1
A, slab that chemical ingredients is following: C 0.065wt%, Si 0.20wt%, Mn 1.40wt%, S 0.004wt%, P 0.015wt%, Nb 0.040wt%, V 0.045wt%, Ti 0.015wt%, N 0.006wt%, Als 0.025wt%; All the other are Fe and inevitable impurity; Send into the soaking zone temperature and be in 1220 ℃ the walking beam heating furnace, heated 180 minutes, wherein slab is 45 minutes in the heat-up time of soaking zone; Fully heavily molten to guarantee Nb, the V microalloy of separating out in the steel billet; Refine austenite crystal grain is also separated out for cooling control after rolling and is prepared, and evenly the slab interior tissue is come out of the stove;
B, use pressure 13 seconds of water spray de-scaling to be carried out in the slab positive and negative of coming out of the stove as the high pressure water of 17MPa;
C, the slab after the de-scaling is sent on the two-shipper frame compact Steckel mill, and the control start rolling temperature is 1100 ℃, carries out the continuous roughing of 4 passages, open water coolant between passage simultaneously, roughing is carried out under the roll speed of 2.2m/s, rough rolling plate blank;
D, with C step gained rough rolling plate blank time-delay 35 seconds; Making the rough rolling plate blank temperature is 880 ℃; Roll speed with 5.8m/s is carried out the continuous finish rolling of 3 passages on same two-shipper frame Steckel mill, make the finish rolling total deformation rate reach 48%, and the control finishing temperature is 840 ℃; And water coolant between the unlatching passage, get the finish rolling steel plate;
E, send reeling machine to batch D step gained finish rolling steel plate, and the control coiling temperature is 580 ℃, controls 20 ℃/s of laminar flow speed of cooling simultaneously, coil of strip;
F, with behind E step gained coil of strip bundling and the mark; Natural air cooling is to room temperature; Promptly obtain the X60 pipe line steel that the transfer oil Sweet natural gas is used; The chemical ingredients of this steel is: C 0.065wt%, Si 0.20wt%, Mn 1.40wt%, S 0.004wt%, P 0.015wt%, Nb 0.040wt%, V 0.045wt%, Ti 0.015wt%, N 0.006wt%, Als 0.025wt%, all the other are Fe and inevitable impurity.
Embodiment 2
A, slab that chemical ingredients is following: C 0.070wt%, Si 0.25wt%, Mn 1.45wt%, S 0.005wt%, P 0.018wt%, Nb 0.045wt%, V 0.040wt%, Ti 0.017wt%, N 0.007wt%, Als 0.030wt%; All the other are Fe and inevitable impurity; Send into the soaking zone temperature and be in 1230 ℃ the walking beam heating furnace, heated 200 minutes, wherein slab is 50 minutes in the time of soaking zone; Fully heavily molten to guarantee Nb, the V microalloy of separating out in the steel billet; Refine austenite crystal grain is also separated out for cooling control after rolling and is prepared, and evenly the slab interior tissue is come out of the stove;
B, use pressure 15 seconds of water spray de-scaling to be carried out in the slab positive and negative of coming out of the stove as the high pressure water of 15MPa;
C, the slab after the de-scaling is sent on the two-shipper frame compact Steckel mill, and the control start rolling temperature is 1120 ℃, carries out the continuous roughing of 5 passages, open water coolant between passage simultaneously, roughing is carried out under the roll speed of 2.5m/s, the roughing steel plate;
D, with step C gained roughing steel plate time-delay 40 seconds; Making the roughing steel billet temperature is 880 ℃; Roll speed with 5.0m/s is carried out the continuous finish rolling of 3 passages on same two-shipper frame Steckel mill, make the finish rolling total deformation rate reach 48%, and the control finishing temperature is 830 ℃; And water coolant between the unlatching passage, get the finish rolling steel plate;
E, send reeling machine to batch step D gained finish rolling steel plate, and the control coiling temperature is 590 ℃, controls 25 ℃/s of laminar flow speed of cooling simultaneously, coil of strip;
F, with behind E step gained coil of strip bundling and the mark; Natural air cooling is to room temperature; Promptly obtain the X60 pipe line steel that the transfer oil Sweet natural gas is used; The chemical ingredients of this steel is C 0.070wt%, Si 0.25wt%, Mn 1.45wt%, S 0.005wt%, P 0.018wt%, Nb 0.045wt%, V 0.040wt%, Ti 0.017wt%, N 0.007wt%, Als 0.030wt%, and all the other are Fe and inevitable impurity.
Embodiment 3
A, slab that chemical ingredients is following: C 0.069wt%, Si 0.22wt%, Mn 1.46wt%, S 0.005wt%, P 0.016wt%, Nb 0.047wt%, V 0.041wt%, Ti 0.018wt%, N 0.006wt%, Als 0.033wt%, all the other are Fe and inevitable impurity; Send into the soaking zone temperature and be in 1240 ℃ the walking beam heating furnace, heated 190 minutes, slab is 50 minutes in the time of soaking zone; Fully heavily molten to guarantee Nb, the V microalloy of separating out in the steel billet; Refine austenite crystal grain is also separated out for cooling control after rolling and is prepared, and evenly the slab interior tissue is come out of the stove;
B, use pressure 10 seconds of water spray de-scaling to be carried out in the slab positive and negative of coming out of the stove as the high pressure water of 20MPa;
C, the slab after the de-scaling is sent on the two-shipper frame compact Steckel mill, and the control start rolling temperature is 1130 ℃, carries out the continuous roughing of 5 passages, open water coolant between passage simultaneously, roughing is carried out under the roll speed of 2.0m/s, the roughing steel plate;
D, with C step gained roughing steel plate time-delay 30 seconds; Making the roughing steel billet temperature is 890 ℃; Roll speed with 5.5m/s is carried out the continuous finish rolling of 3 passages on same two-shipper frame Steckel mill, make the finish rolling total deformation rate reach 45%, and the control finishing temperature is 830 ℃; And water coolant between the unlatching passage, get the finish rolling steel plate;
E, send reeling machine to batch D step gained finish rolling steel plate, and the control coiling temperature is 570 ℃, controls 25 ℃/s of laminar flow speed of cooling simultaneously, coil of strip;
D, with behind E step gained coil of strip bundling and the mark; Natural air cooling is to room temperature; Promptly obtain the X60 pipe line steel of transfer oil Sweet natural gas; The chemical ingredients of this steel is C 0.069wt%, Si 0.22wt%, Mn 1.46wt%, S 0.005wt%, P 0.016wt%, Nb 0.047wt%, V 0.041wt%, Ti 0.018wt%, N 0.006wt%, Als 0.033wt%, and all the other are Fe and inevitable impurity.
Claims (4)
1. the preparation method of an X60 pipe line steel is characterized in that through following process steps:
A, slab that chemical ingredients is following:
C：0.060～0.080wt％ Nb：0.035～0.055wt％
Si：0.15～0.30wt％ V：0.035～0.055wt％
Mn：1.35～1.55wt％ Ti：0.010～0.025wt％
Als：0.010～0.040wt％ S：≤0.006wt％
P：≤0.020wt％ N：≤0.008wt％
Surplus is Fe and inevitable impurity,
Sending the soaking zone temperature is in 1200～1260 ℃ the process furnace, to heat 150～220 minutes, comes out of the stove:
B, to use pressure be that the high pressure water of 15～20MPa is to coming out of the stove 10～15 seconds of slab positive and negative water jet descaling;
C, send two-shipper frame compact Steckel mill to be rolled the slab after the de-scaling, and the control start rolling temperature is 1080～1180 ℃, carries out the continuous roughing of 4～6 passages, open water coolant between passage simultaneously, the roughing steel plate;
D, with C step gained roughing steel plate time-delay 30～60 seconds, make the roughing steel billet temperature be lower than 900 ℃, carry out the continuous finish rolling of 3 passages, and open water coolant between passage, the control finishing temperature is 800～840 ℃, the finish rolling steel plate;
E, send reeling machine to batch D step gained finish rolling steel plate, and the control coiling temperature is 560～600 ℃, controls 20～25 ℃/s of laminar flow speed of cooling simultaneously, roll of steel plate;
F, with E step gained roll of steel plate natural air cooling to room temperature, promptly obtain HS, high ductility X 60/X pipe line steel.
2. the preparation method of X60 pipe line steel as claimed in claim 1; The process furnace that it is characterized in that said A step is a conventional equipment; Slab was controlled at 40～60 minutes in the time of process furnace soaking zone; Fully heavily molten to guarantee Nb, the V microalloy of separating out in the slab, refine austenite crystal grain is also separated out for cooling control after rolling and is prepared, with even slab interior tissue.
3. the preparation method of X60 pipe line steel as claimed in claim 1; It is characterized in that in the said D step roughing steel plate being delayed time, is to let the roughing steel plate on the ground roller, back and forth move about 30～60 seconds, carries out finish rolling afterwards again; And control finish rolling total deformation rate is greater than 40%; Slab generation relaxation after the continuous roughing gross distortion is separated out, obtain the roughed bloom of evenly tiny austenite structure, effectively prevent the generation of mixed crystal.
4. the preparation method of X60 pipe line steel as claimed in claim 1 is characterized in that road number of times, roll speed, the rolling time of said C to D step, looks the different size requirement and specifically confirms.
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| CN201010243229XA CN101928882B (en) | 2010-08-03 | 2010-08-03 | X60 pipe line steel and production method thereof |
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| CN103725988B (en) * | 2013-12-26 | 2016-06-01 | 秦皇岛首秦金属材料有限公司 | Continuously cast bloom produces high-grade think gauge pipe fitting hot rolled slab and manufacture method thereof |
| CN104561779B (en) * | 2014-12-04 | 2017-06-13 | 昆明理工大学 | A kind of Q550 grades of shock resisting steel and with steekle mill produce the Q550 grades of method of shock resisting steel |
| CN104561780A (en) * | 2014-12-04 | 2015-04-29 | 昆明理工大学 | Q420-grade anti-seismic steel and method for producing Q420-grade anti-seismic steel by virtue of steckel mill |
| CN110541109B (en) * | 2019-07-26 | 2021-10-15 | 邯郸钢铁集团有限责任公司 | Acid-resistant pipeline steel X60MOS for seabed and production method thereof |
| CN111790753A (en) * | 2020-05-28 | 2020-10-20 | 南京钢铁股份有限公司 | Wide and thin X60 steel grade pipeline steel of single-stand steckel mill and rolling method |
| CN111842489B (en) * | 2020-07-01 | 2022-02-08 | 东北大学 | Method for improving surface quality of hot-rolled pipeline steel |
| CN111910126B (en) * | 2020-08-06 | 2022-02-01 | 东北大学 | Thick high-toughness X80 pipeline steel and production method thereof |
| CN115261741A (en) * | 2022-07-21 | 2022-11-01 | 重庆钢铁股份有限公司 | Production method of hot-rolled X65 pipeline steel |
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| JPH10265848A (en) * | 1997-03-27 | 1998-10-06 | Nkk Corp | Production of high strength hot rolled steel plate excellent in low temp. toughness |
| AU2004315176B2 (en) * | 2004-02-04 | 2008-06-12 | Nippon Steel Corporation | Steel product for line pipe excellent in resistance to HIC and line pipe produced by using the steel product |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20030021965A (en) * | 2001-09-10 | 2003-03-15 | 주식회사 포스코 | a hot-rolled steel sheet wiht good ultra low temperature toughness and the method of the same |
| CN101705438A (en) * | 2009-11-13 | 2010-05-12 | 首钢总公司 | X70 hot-rolled steel coil for pipeline steel and manufacturing method thereof |
Non-Patent Citations (1)
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