CN101928884B - X52 pipeline steel and production method thereof - Google Patents
X52 pipeline steel and production method thereof Download PDFInfo
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- CN101928884B CN101928884B CN2010102432586A CN201010243258A CN101928884B CN 101928884 B CN101928884 B CN 101928884B CN 2010102432586 A CN2010102432586 A CN 2010102432586A CN 201010243258 A CN201010243258 A CN 201010243258A CN 101928884 B CN101928884 B CN 101928884B
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Abstract
The invention provides an X52 pipeline steel and a production method thereof. The X52 pipeline steel comprises the following chemical components: 0.070-0.090wt% of C, 0.15-0.30wt% of Si, 1.10-1.30wt% of Mn, 0.006wt% or more of S, 0.020wt% or more of P, 0.020-0.040wt% of Nb, 0.010-0.020wt% of Ti, 0.008wt% or more of N, 0.010-0.040wt% of Als, the rest of Fe and unavoidable impurities. After heating and descaling, rough rolling and finish rolling are performed on the same dual-frame compact Steckel mill continuously; through delayed rolling control in rolling process, the enhancement function of microalloy elements such as Nb and V added to the steel are given a full play, thereby obtaining superfine and uniform tissue, effectively preventing the occurrence of mixed crystal, and greatly improving the strength and toughness of the X52 pipeline steel. The X52 pipeline steel produced with the method belongs to high-technology product with high additional value, thus the economical benefit is significant.
Description
Technical field
The present invention relates to a kind of X52 pipe line steel, relate in particular to a kind of X52 pipe line steel and working method thereof that is used for the transfer oil Sweet natural gas, 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, along with the develop rapidly of pipework, driven the significantly raising of pipeline steel output, pipe line steel production is able to develop rapidly.Wherein, the X52 level pipeline pipeline steel is as pipework, the normal steels of branch line engineering particularly, and production technology is greatly developed.The process method that enterprise adopted of domestic production X52 pipe line steel has nothing in common with each other at present.Mention Heavy Plate Production technology and Steckel mill production technique in for example conventional semi continuous hot continuous rolling process, CSP casting and rolling process, some other document.For using the rolling X52 pipe line steel of Steckel mill, the mode that generally adopts is with steel to get into the single chassis Steckel mill then and is carried out finish rolling on four rollers (or two rollers) roughing mill, carrying out roughing earlier.But how on a two-shipper frame compact Steckel mill, accomplish continuously roughing, in roll and finish rolling, thereby the HS of producing, H.T. X52 pipe line steel, then beyond example can be reflected.
Summary of the invention
The present invention aims to provide a kind of HS, H.T. X52 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, H.T. X52 pipe line steel.
The Chemical Composition that HS provided by the invention, H.T. X52 pipe line steel have following weight ratio:
C：0.070～0.090wt％，Si：0.15～0.30wt％，
Mn：1.10～1.30wt％，?Nb：0.020～0.040wt％，
Ti：0.010～0.020wt％， Als：0.010~0.040wt％，
S：≤0.006wt％， P：≤0.020wt％，
N :≤0.008wt%, all the other are Fe and inevitable impurity.
Preparing method's process the following step of HS provided by the invention, H.T. X52 pipe line steel:
A, slab that chemical ingredients is following:
C：0.070～0.090wt％， Si：0.15～0.30wt％，
Mn：1.10～1.30wt％， Nb：0.020～0.040wt％，
Ti：0.010～0.020wt％， Als：0.010~0.040wt％，
S：≤0.006wt％， P：≤0.020wt％，
N :≤0.008wt%, all the other are Fe and inevitable impurity,
Sending the soaking zone temperature is in 1200～1240 ℃ the process furnace, to heat 140～220 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 1050～1150 ℃, 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 20～50 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 810～850 ℃, the finish rolling steel plate;
E, send reeling machine to batch D step gained finish rolling steel plate, and the control coiling temperature is 580～620 ℃, controls 10～15 ℃/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, H.T. X52 pipe line steel.The chemical ingredients of this steel is: C 0.070～0.090wt%, Si 0.15～0.30wt%, Mn 1.10～1.30wt%, S≤0.006wt%, P≤0.020wt%, Nb 0.020 ~ 0.040wt%, Ti 0.010 ~ 0.020wt%, N≤0.008wt%, Als 0.010 ~ 0.040wt%, all the other are Fe and inevitable impurity.
The process furnace of 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.
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 20 ~ 50 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.
10～15 ℃/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 X52 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 X52 pipe line steel.
3, utilize the slab of Chemical Composition provided by the invention; The X52 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 X52 pipe line steel welding provided by the invention meet U.S. API standard, satisfy oil and gas and carry the requirement with steel pipe.
4, the X52 pipe line steel of this method production is compared with other conventional products, has high technology content, high added value characteristics, remarkable in economical benefits.
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 0.075wt%, Si 0.20wt%, Mn 1.20wt%, S 0.005wt%, P 0.015wt%, Nb 0.025wt%, Ti 0.015wt%, N 0.007wt%, 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 170 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 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, send two-shipper frame compact Steckel mill to be rolled the slab after the de-scaling, 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 1.9m/s, the roughing steel plate;
D, with C step gained roughing steel plate time-delay 35 seconds; Making the roughing steel billet temperature is 890 ℃; Roll speed with 4.1m/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 600 ℃, 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 X52 pipe line steel of transfer oil Sweet natural gas; The chemical ingredients of this steel is: C 0.075wt%, Si 0.20wt%, Mn 1.20wt%, S 0.005wt%, P 0.015wt%, Nb 0.025wt%, Ti 0.015wt%, N 0.007wt%, Als 0.025wt%, all the other are Fe and inevitable impurity.
Embodiment 2
A, slab that chemical ingredients is following: C 0.07wt%, Si 0.15wt%, Mn 1.10wt%, S 0.006wt%, P 0.02wt%, Nb 0.02wt%, Ti 0.01wt%, N 0.007wt%, Als 0.04wt%; All the other are Fe and inevitable impurity; Send into the soaking zone temperature and be in 1200 ℃ the walking beam heating furnace, heated 140 minutes, slab is 40 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, send two-shipper frame compact Steckel mill to be rolled the slab after the de-scaling, and the control start rolling temperature is 1050 ℃, carries out the continuous roughing of 6 passages, open water coolant between passage simultaneously, roughing is carried out under the roll speed of 1.3m/s, the roughing steel plate;
D, with C step gained roughing steel plate time-delay 20 seconds; Making the roughing steel billet temperature is 890 ℃; Roll speed with 3.4m/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 47%, and the control finishing temperature is 810 ℃; 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 22 ℃/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 X52 pipe line steel of transfer oil Sweet natural gas; The chemical ingredients of this steel is: C 0.07wt%, Si 0.15wt%, Mn 1.10wt%, S 0.006wt%, P 0.02wt%, Nb 0.02wt%, Ti 0.01wt%, N 0.007wt%, Als 0.04wt%, all the other are Fe and inevitable impurity.
Embodiment 3
A, slab that chemical ingredients is following: C 0.09wt%, Si 0.3wt%, Mn 1.3wt%, S 0.007wt%, P 0.017wt%, Nb 0.04wt%, Ti 0.02wt%, N 0.0075wt%, Als 0.01wt%; All the other are Fe and inevitable impurity; Send into the soaking zone temperature and be in 1240 ℃ the walking beam heating furnace, heated 220 minutes, slab is 60 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, send two-shipper frame compact Steckel mill to be rolled the slab after the de-scaling, and the control start rolling temperature is 1150 ℃, carries out the continuous roughing of 4 passages, open water coolant between passage simultaneously, roughing is carried out under the roll speed of 3.0m/s, the roughing steel plate;
D, with C step gained roughing steel plate time-delay 50 seconds; Making the roughing steel billet temperature is 860 ℃; 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 48%, and the control finishing temperature is 850 ℃; 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 620 ℃, controls 30 ℃/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 X52 pipe line steel of transfer oil Sweet natural gas; The chemical ingredients of this steel is: C 0.09wt%, Si 0.3wt%, Mn 1.3wt%, S 0.007wt%, P 0.017wt%, Nb 0.04wt%, Ti 0.02wt%, N 0.0075wt%, Als 0.01wt%, all the other are Fe and inevitable impurity.
Claims (4)
1. the working method of an X52 pipe line steel is characterized in that through following process steps:
A, slab that chemical ingredients is following:
C：0.070～0.090wt％，?Si：0.15～0.30wt％，
Mn：1.10～1.30wt％， Nb：0.020～0.040wt％，
Ti：0.010～0.020wt％，Als：0.010～0.040wt％，
S：≤0.006wt％， P：≤0.020wt％，
N :≤0.008wt%, all the other are Fe and inevitable impurity,
Sending the soaking zone temperature is in 1200～1240 ℃ the process furnace, to heat 140～220 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 1050～1150 ℃, 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 20～50 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 810～850 ℃, the finish rolling steel plate;
E, send reeling machine to batch D step gained finish rolling steel plate, and the control coiling temperature is 580～620 ℃, controls 10～15 ℃/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, H.T. X52 pipe line steel.
2. the working method of an X52 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 working method of an X52 pipe line steel as claimed in claim 1 is characterized in that said
In the D step roughing steel plate is delayed time; Be to let the roughing steel plate on the ground roller, back and forth move about 20～50 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.
4. the working method of an X52 pipe line steel as claimed in claim 1 is characterized in that road number of times, the roll speed of said C to D step, looks the different size requirement and specifically confirms.
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| CN2010102432586A CN101928884B (en) | 2010-08-03 | 2010-08-03 | X52 pipeline steel and production method thereof |
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| CN2010102432586A CN101928884B (en) | 2010-08-03 | 2010-08-03 | X52 pipeline steel and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102764760A (en) * | 2012-07-03 | 2012-11-07 | 南京钢铁股份有限公司 | Method for manufacturing high surface quality hot-rolled steel plate |
| CN102899559A (en) * | 2012-10-12 | 2013-01-30 | 吉林建龙钢铁有限责任公司 | Preparation method of steel for oil delivery pipeline |
| CN102989785B (en) * | 2012-12-17 | 2015-01-14 | 济钢集团有限公司 | Process for controlling surface piebaldness of steel plates |
| 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 |
| CN106319362A (en) * | 2015-06-16 | 2017-01-11 | 鞍钢股份有限公司 | X52 seamless pipeline steel pipe with sour corrosion resistance and manufacturing method of X52 seamless pipeline steel pipe |
| CN107988547A (en) * | 2016-10-27 | 2018-05-04 | 鞍钢股份有限公司 | A kind of effective X52MS hot-rolled coils of high-frequency resistance welding (HFRW) and its manufacture method |
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- 2010-08-03 CN CN2010102432586A patent/CN101928884B/en active Active
Non-Patent Citations (2)
| Title |
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| 任毅等.鞍钢ASP线X52级管线钢的研制.《2003中国钢铁年会论文集》.2003,393. * |
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