CN105861799A - Thick vanadium-containing pipeline steel and production method thereof - Google Patents
Thick vanadium-containing pipeline steel and production method thereof Download PDFInfo
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- CN105861799A CN105861799A CN201610380000.8A CN201610380000A CN105861799A CN 105861799 A CN105861799 A CN 105861799A CN 201610380000 A CN201610380000 A CN 201610380000A CN 105861799 A CN105861799 A CN 105861799A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
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- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to thick vanadium-containing pipeline steel and a production method thereof, belonging to the technical field of pipeline steel. The invention aims at providing a production method of thick vanadium-containing pipeline steel with low cost and good performance in a welding heat affected zone. In the method, through general molten iron desulfurization and converter smelting, the molten steel composition is controlled within certain range; a slab is obtained by continuous casting and then rolled; and the rolling parameters and the chemical components of molten steel are strictly controlled to obtain the thick vanadium-containing pipeline steel with thickness of 12.5-22.0mm. In the invention, expensive Nb alloy element is not needed, a V microalloying way is adopted for production, an aim of high strength is achieved through precipitation strengthening, and the produced pipeline steel has low yield ratio; in the welding process, due to the secondary precipitation of V, the performance of the welding heat affected zone is good; and the method has the characteristics of low cost, easiness in rolling technology control, strong adaptability and the like.
Description
Technical field
The present invention relates to think gauge and contain vanadium pipe line steel and production method thereof, belong to technical field of pipeline steel.
Background technology
Pipeline steel is mainly used in the conveying of the flowing materials such as crude oil, product oil, natural gas and water-coal-slurry.The international average energy disappears
Taking in structure, natural gas accounts for the 23% of total energy consumption figure, and the current natural gas consumption of China only accounts for the 2.1% of total energy；At iron
In road, highway, aviation, water transport and 5 kinds of means of transportation of pipeline, pipeline transportation is the transporter of a kind of economy, continuous safe
Formula.The U.S. uses pipeline conveying logistics to account for about the 16% of total gross traffic, and China only accounts for 3～4%, is transported by pipeline in the world
Defeated material accounts for the 20% of transport total amount, and China is less than 2%.At present, global Oil Gas pipeline overall length more than 2,600,000 kilometers,
Only Russia just has 210,000 kilometers, and China's trunk line only about 8.2 ten thousand kilometers.
Oil, natural gas transmission pipeline are divided into long-distance transport pipes and infield gathering line two parts.Long-distance transport pipes are in order to improve
Transfer efficiency, backbone discharge pressure is higher, it is desirable to select the other steel grade of higher intensity level, such as X70, X80 rank；Collect defeated
The pipeline delivery pressure that pipeline, branch line and some throughput rates are less is relatively low, the general steel grade selecting intensity relatively low, as X42, X46,
X52 rank.
At present, domestic L360/X52 level pipe line steel typically uses Nb, Ti microalloying mode to produce.Such as patent CN101928884A
Disclosing the production method of a kind of X52 pipe line steel, in this pipe line steel, chemical composition is: C:0.07～0.09%, Si:0.15～
0.30%, Mn:1.10～1.30%, Nb:0.020～.040%, Ti:0.010～0.020%, Als:0.010～0.040%.
The X52 chemical composition that Sha Gang group produces is: C:0.08～0.10%, Si:0.22～0.33%, Mn:1.21～1.33%,
Nb:0.037～0.055%, Ti:0.014～0.018%.The L360 chemical composition that wine steel produces is: C:0.08～0.12%,
Si:0.10～0.25%, Mn:1.10～1.30%, Nb:0.03～0.05%.
Visible, the L360/X52 level pipe line steel of domestic production with the addition of microalloy element Nb substantially.The most important effect of Nb is resistance
The only recrystallization of deformed austeaite, it is thus achieved that the flat austenite crystal that extremely the deformation energy storage of elongation is the highest, the most also can stop
Ferrite crystal grain is grown up, and obtains the most tiny ferrite crystal grain.But, alloy element Nb is expensive, adds enterprise
Production cost.Along with enterprise's raising to energy-saving and cost-reducing requirement, seeking without Nb in pipe line steel, but can obtain equal
The X52 pipe line steel of performance.
The present inventor is devoted for years to the research in pipe line steel, and its patent CN103572025A discloses a kind of low cost
The production method of X52 pipe line steel, the chemical component weight percentage of described X52 pipe line steel is: C:0.08～0.12wt%, Si:
≤ 0.35wt%, Mn:1.10～1.40wt%, P :≤0.025wt%, S :≤0.025wt%, Ti:0.010～0.020wt%,
Remaining is Fe and inevitable impurity.Use the steel of this composition, coordinate corresponding rolling process, it is possible to reduce the cost of pipe line steel,
But, this pipe line steel, when welding, is affected by welding process, and the performance of welding heat affected zone is the best, needs further to be carried
High.
Welding heat affected zone is under the effect of Thermal Cycle, and weld seam both sides are in the mother metal of solid-state and significantly tissue and property occur
The region that can change.Different from weld seam, weld seam by the adjustment of the chemical composition of welding rod, then can coordinate suitable welding procedure
Ensure the requirement of performance, and heat affected area chemical composition is identical with mother metal, be the Tissue distribution just produced under thermal cycle effect
Non-uniformity problem.
Patent CN105063494A discloses the production method of a kind of think gauge X60 pipe line steel, comprises the steps: that slab adds
Heat carries out roughing after 1185～1220 DEG C of soaking；Carrying out finish rolling again, entry temperature at finishing is 960～1000 DEG C, finishing temperature
For, 830～870 DEG C, the cooling velocity of 15～40 DEG C/s is cooled to higher 10～30 DEG C than coiling temperature, after air cooling 4～6s again with 5～
The cooling velocity of 15 DEG C/s is batched within the temperature range of being cooled to 560～630 DEG C and get final product.The method is applicable to the X60 of special component
The production of the pipe line steel of rank, for other chemical compositions and the steel of grade, particularly X52 pipe line steel, uses the method to produce
If, its mechanical property is poor.
Summary of the invention
Present invention solves the technical problem that and be to provide a kind of low cost, welding heat affected zone function admirable think gauge pipeline Han vanadium
The production method of steel.
The think gauge of the present invention production method containing vanadium pipe line steel, comprises the steps: that slab, after 1210～1240 DEG C of soaking, is adopted
Roughing is carried out by 3～7 passages；Carrying out finish rolling through 4～7 frames again, finishing temperature is 830～870 DEG C, and 10～30 DEG C/s's is cold
But speed is cooled to 700～760 DEG C, after air cooling 1～5s again with the cooling velocity of 30～60 DEG C/s be cooled to 660～680 DEG C again with
5～15 DEG C/s batches within the temperature range of being cooled to 580～620 DEG C, obtains think gauge containing vanadium pipe line steel wherein, described pipe line steel
Chemical composition be made up of the component of following mass percent: C:0.07～0.12%, Si :≤0.35%, Mn:0.90～1.30%,
P :≤0.025%, S :≤0.025%, V:0.05～0.10%, surplus is Fe and inevitable impurity element.
Preferably, the thickness of slab is 200mm～230mm, and the workpiece thickness after roughing is 40～60mm, and think gauge contains
The thickness of vanadium pipe line steel finished product is 12.5～22.0mm.
Think gauge of the present invention pipe line steel Han vanadium, preferably its chemical composition are made up of the component of following mass percent: C:0.07～
0.11%, Si:0.05～0.26%, Mn:0.97～1.22%, P:0.009～0.011%, S:0.004～0.007%, V:
0.06～0.10%, surplus is Fe and inevitable impurity element.
The present invention also provides for think gauge pipe line steel Han vanadium that the inventive method prepares.
Think gauge of the present invention pipe line steel Han vanadium, its finished product is organized as ferrite+pearlite, and mechanical property is: yield strength
Rel >=360MPa, tensile strength Rm >=460MPa, elongation percentage A >=20.0%, the ballistic work >=60J of-20 DEG C, meet L360/X52
The regulation of level pipe line steel.
Compared with prior art, present invention eliminates the Nb alloying element of costliness, use V microalloying mode to produce,
Reach to improve the purpose of intensity by precipitation strength, the pipe line steel yield tensile ratio of production is low, due to the secondary precipitation of V in welding process,
Welding heat affected zone function admirable, has low cost, rolling mill practice controls the features such as simple and strong adaptability.
Detailed description of the invention
The think gauge of the present invention production method containing vanadium pipe line steel, comprises the steps: that slab, after 1210～1240 DEG C of soaking, is adopted
Roughing is carried out by 3～7 passages；Carrying out finish rolling through 4～7 frames again, finishing temperature is 830～870 DEG C, and 10～30 DEG C/s's is cold
But speed is cooled to 700～760 DEG C, after air cooling 1～5s again with the cooling velocity of 30～60 DEG C/s be cooled to 660～680 DEG C again with
5～15 DEG C/s batches within the temperature range of being cooled to 580～620 DEG C, obtains think gauge containing vanadium pipe line steel wherein, described pipe line steel
Chemical composition be made up of the component of following mass percent: C:0.07～0.12%, Si :≤0.35%, Mn:0.90～1.30%,
P :≤0.025%, S :≤0.025%, V:0.05～0.10%, surplus is Fe and inevitable impurity element.
The present invention can by usual desulfurizing iron, converter smelting, by molten steel composition control within the above range, through being casting continuously to form slab
Rolling prepares again.
Wherein, C is to increase the effective element of the intensity of steel, but it has negative effect to toughness, plasticity and the weldability of steel.
The mass percent of C is 0.07～0.12% the most in the present invention, to ensure while increasing the intensity of steel, does not reduce it
Toughness, plasticity and weldability.
Mn can improve hardness of steel and wearability, moreover it is possible to refinement pearlitic structrure, improves its plasticity.But the too high meeting of Fe content is led
Cause obvious segregation and tissue deterioration, affect toughness properties.Therefore in the present invention, the mass percent of Mn is 0.9～1.30%.
The Grain refinement of V is strong, can improve intensity and the toughness of steel, reduces superheated susceptivity, improves heat endurance, and
Due to the secondary precipitation of V in welding process, the performance of welding heat affected zone can be improved.In order to ensure the welding of pipe line steel of the present invention
The performance of the zone of influence, in the present invention, the mass percent of V is 0.05～0.10%.
Further, the preferably thickness of slab is 200mm～230mm, and the workpiece thickness after roughing is 40～60mm, thick
The specification thickness containing vanadium pipe line steel finished product is 12.5～22.0mm.
Think gauge of the present invention pipe line steel Han vanadium, preferably its chemical composition are made up of the component of following mass percent: C:0.07～
0.11%, Si:0.05～0.26%, Mn:0.97～1.22%, P:0.009～0.011%, S:0.004～0.007%, V:
0.06～0.10%, surplus is Fe and inevitable impurity element.
The present invention also provides for think gauge pipe line steel Han vanadium that the inventive method prepares.
Think gauge of the present invention pipe line steel Han vanadium, its finished product is organized as ferrite+pearlite, and mechanical property is: Rel >=360MPa,
Rm >=460MPa, A >=20.0%, ballistic work >=60J of-20 DEG C, meets the regulation of L360/X52 level pipe line steel.
Below in conjunction with embodiment, the detailed description of the invention of the present invention is further described, the most therefore limits the present invention to institute
Among the scope of embodiments stated.
Embodiment 1
The chemical component weight percentage of L360/X52 pipe line steel is C:0.11%, Si:0.17%, Mn:1.22%, P:0.015%,
S:0.004%, V:0.08%, surplus is Fe and inevitable impurity element composition；It is cast into conventional continuous cast method
The continuous casting steel billet that 230mm is thick；Being heated to 1240 DEG C and carry out roughing, after roughing, intermediate slab thickness at 58mm, finished product thickness is
20.0mm；Finishing temperature is 870 DEG C；It is cooled to 750 DEG C with the cooling rate of 17 DEG C/s, after air cooling 2s, then with 30 DEG C/s after finish rolling
Cooling rate be cooled to 680 DEG C and be cooled to 600 DEG C with the cooling rate of 5 DEG C/s again and batch；Obtain pipe line steel finished product.
After testing, pipe line steel end properties is shown in Table 2.
Using submerged-arc welding method to weld, the performance of its welding heat affected zone is shown in Table 3.
Embodiment 2
The chemical component weight percentage of L360/X52 pipe line steel is C:0.07%, Si:0.26%, Mn:1.08%, P:0.009%,
S:0.007%, V:0.06%, surplus is Fe and inevitable impurity element composition；It is cast into conventional continuous cast method
The continuous casting steel billet that 200mm is thick；Being heated to 1210 DEG C and carry out roughing, after roughing, intermediate slab thickness at 48mm, finished product thickness is
13.8mm；Finishing temperature is 850 DEG C；It is cooled to 720 DEG C with the cooling rate of 25 DEG C/s, after air cooling 1s, then with 50 DEG C/s after finish rolling
Cooling rate be cooled to 660 DEG C and be cooled to 580 DEG C with the cooling rate of 15 DEG C/s again and batch；Obtain pipe line steel finished product.
After testing, pipe line steel end properties is shown in Table 2.
Using submerged-arc welding method to weld, the performance of its welding heat affected zone is shown in Table 3.
Embodiment 3
The chemical component weight percentage of L360/X52 pipe line steel is C:0.09%, Si:0.05%, Mn:0.97%, P:0.011%,
S:0.006%, V:0.10%, surplus is Fe and inevitable impurity element composition；It is cast into conventional continuous cast method
The continuous casting steel billet that 230mm is thick；Being heated to 1220 DEG C and carry out roughing, after roughing, intermediate slab thickness at 53mm, finished product thickness is
17.0mm；Finishing temperature is 830 DEG C；It is cooled to 700 DEG C with the cooling rate of 21 DEG C/s, after air cooling 4s, then with 40 DEG C/s after finish rolling
Cooling rate be cooled to 660 DEG C and be cooled to 620 DEG C with the cooling rate of 8 DEG C/s again and batch；Obtain pipe line steel finished product.
After testing, pipe line steel end properties is shown in Table 2.
Using submerged-arc welding method to weld, the performance of its welding heat affected zone is shown in Table 3.
Comparative example 1
The chemical component weight percentage of L360/X52 pipe line steel is C:0.09%, Si:0.05%, Mn:0.97%, P:0.011%,
S:0.006%, V:0.10%, surplus is Fe and inevitable impurity element composition；It is cast into conventional continuous cast method
The continuous casting steel billet that 230mm is thick；Being heated to 1220 DEG C and carry out roughing, after roughing, intermediate slab thickness at 53mm, finished product thickness is
17.0mm；Finishing temperature is 830 DEG C；It is cooled to 660 DEG C with the cooling rate of 21 DEG C/s, after air cooling 6s, then with 15 DEG C/s after finish rolling
Cooling rate be cooled to 630 DEG C and batch；Obtain pipe line steel finished product.
After testing, pipe line steel end properties is shown in Table 2.
Using submerged-arc welding method to weld, the performance of its welding heat affected zone is shown in Table 3.
Comparative example 2
The chemical component weight percentage of L360/X52 pipe line steel is C:0.09%, Si:0.05%, Mn:0.97%, P:0.011%,
S:0.006%, Ti:0.015%, surplus is Fe and inevitable impurity element composition；It is cast into conventional continuous cast method
The continuous casting steel billet that 230mm is thick；Being heated to 1220 DEG C and carry out roughing, after roughing, intermediate slab thickness at 53mm, finished product thickness is
17.0mm；Finishing temperature is 800 DEG C；It is cooled to 700 DEG C with the cooling rate of 21 DEG C/s, after air cooling 6s, then with 15 DEG C/s after finish rolling
Cooling rate be cooled to 630 DEG C and batch；Obtain pipe line steel finished product.
After testing, pipe line steel end properties is shown in Table 2.
Using submerged-arc welding method to weld, the performance of its welding heat affected zone is shown in Table 3.
Table 1 pipe line steel chemical composition
The performance of table 2 pipe line steel
The performance of table 3 welding heat affected zone
By above-described embodiment and comparative example, use method disclosed in CN105063494A, can not be prepared this
The pipe line steel of the L360/X52 of invention, and compared with the existing method using interpolation Ti microalloying, the inventive method uses
V microalloying mode produces, and due to the secondary precipitation of V in welding process, reaches to improve the mesh of intensity by precipitation strength
, its welding heat affected zone is functional.Additionally, present invention eliminates the Nb alloying element of costliness, there is low cost, roll
Technology controlling and process processed is simple and the feature such as strong adaptability.
Claims (5)
1. the think gauge production method containing vanadium pipe line steel, it is characterised in that comprise the steps: that slab is at 1210～1240 DEG C
After soaking, 3～7 passages are used to carry out roughing；Carrying out finish rolling through 4～7 frames again, finishing temperature is 830～870 DEG C, 10～
The cooling velocity of 30 DEG C/s is cooled to 700～760 DEG C, after air cooling 1～5s again with the cooling velocity of 30～60 DEG C/s be cooled to 660～
680 DEG C be cooled to 580～620 DEG C with 5～15 DEG C/s again within the temperature range of batch, obtain think gauge pipe line steel Han vanadium, wherein,
The chemical composition of described pipe line steel is made up of the component of following mass percent: C:0.07～0.12%, Si :≤0.35%, Mn:
0.90～1.30%, P :≤0.025%, S :≤0.025%, V:0.05～0.10%, surplus is Fe and inevitable impurity element.
The think gauge the most according to claim 1 production method containing vanadium pipe line steel, it is characterised in that: the thickness of slab is
200mm～230mm, the workpiece thickness after roughing is 40～60mm, think gauge containing the thickness of vanadium pipe line steel finished product be 12.5～
22.0mm。
The think gauge the most according to claim 1 and 2 production method containing vanadium pipe line steel, it is characterised in that its chemical composition
It is made up of the component of following mass percent: C:0.07～0.11%, Si:0.05～0.26%, Mn:0.97～1.22%, P:
0.009～0.011%, S:0.004～0.007%, V:0.06～0.10%, surplus is Fe and inevitable impurity element.
4. think gauge pipe line steel Han vanadium that the production method containing vanadium pipe line steel of the think gauge described in any one of claims 1 to 3 produces.
Think gauge the most according to claim 4 pipe line steel Han vanadium, it is characterised in that: finished product is organized as ferrite+pearlite,
Mechanical property is: yield strength Rel >=360MPa, tensile strength Rm >=460MPa, elongation percentage A >=20.0%, the impact of-20 DEG C
Merit >=60J.
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| CN104513928A (en) * | 2014-12-25 | 2015-04-15 | 河北钢铁股份有限公司承德分公司 | Broad hot strip steel production method for vanadium-containing middle-level petroleum and natural gas conveying tube |
| CN105063494A (en) * | 2015-08-27 | 2015-11-18 | 攀钢集团西昌钢钒有限公司 | Heavy gauge X60 pipeline steel and manufacturing method thereof |
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