CN105112781A - Steel for thick-specification vanadium-contained welding structure and preparation method thereof - Google Patents
Steel for thick-specification vanadium-contained welding structure and preparation method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of production of hot continuous rolling plate strips, and in particular, relates to a hot-rolled steel plate for a thick-specification vanadium-contained welding structure with tensile strength of 520 MPa. The steel for the thick-specification welding structure consists of the following components in percentage by weight: 0.05-0.12% of C, Si not more than 0.10%, 1.05-0.50% of Mn, P not more than 0.020%, S not more than 0.015%, 0.010-0.030% of Ti, 0.06-0.10% of V, and the balance of Fe and inevitable impurities. A Mn-V microalloying mode is adopted to prevent the adding of such noble elements as Cu and Ni. A controlled rolling and controlled cooling process is adopted to produce the steel for the 520 MPa-grade welding structure with ferrite and pearlite structures; and the product has the characteristics of high strength, stable mechanical performance, excellent toughness matchability and molding performance and excellent welding performance, and is better in promotion and application prospect.
Description
Technical field
The invention belongs to hot continuous rolling strip production technical field, particularly relate to a kind of tensile strength 520MPa level think gauge containing vanadium welded construction hot-rolled steel sheet.
Background technology
Steel for welded structures is widely used in the industries such as bridge, building, electric power, marine oil, rolling stock.Along with steel construction is to maximization, lightweight, high efficiency development, the performance of structural steel is had higher requirement.Korea S and Japan are just at the 2nd generation steel for welded structures of R & D intensity high twice, long service life twice, and this will make added value be doubled and redoubled, and can reduce again the use total amount of steel simultaneously.
Publication number is " CN201110176676 ", denomination of invention is " one can weld fine grained structural steel S355NL/S355NLZ35 steel plate and production method thereof ", disclosing a kind of chemical composition is C:0.10% ~ 0.18%, Si:0.20% ~ 0.45%, Mn:1.20% ~ 1.45%, P :≤0.018%, : S :≤0.005%, V:0.010% ~ 0.055%, Ti:0.005% ~ 0.025%, pass through controlled rolling and controlled cooling, cooling in heap, normalizing process, thus ensure that the property indices that can weld fine grained structural steel S355NL/S355NLZ35 steel plate reaches standard-required.
Publication number is " CN201210154046 ", denomination of invention is " a kind of Welded Structural Steel and manufacture method thereof ", disclosing a kind of chemical composition is C:0.10% ~ 0.14%, Si:0.10% ~ 0.45%, Mn:1.00% ~ 1.39%, S :≤0.010%, P :≤0.020%, Nb:0.015% ~ 0.040%, Ti:0.008% ~ 0.030%, V:0 ~ 0.080%, Ni:0.10% ~ 0.50%, Cr:0.15% ~ 0.65%, Mo:0.15% ~ 0.40%, manufacture method comprises smelting, casting, heating, rolling, cooling, Quench and temper, wherein, other Welded Structural Steel of different intensity scale can be obtained by controlling tempered condition.
Publication number is " CN201210564686 ", denomination of invention is " a kind of 355MPa level low welding crack sensitivity steel plate and production method ", disclosing a kind of chemical composition is C:0.09% ~ 0.13%, Si:0.25% ~ 0.35%, Mn:1.20% ~ 1.50%, P :≤0.015%, S :≤0.005%, Al:0.025% ~ 0.04%, Nb:0.02% ~ 0.05%, Ti:0.01% ~ 0.03%, Cu:0.10% ~ 0.3%, Ni:0.10% ~ 0.3%, produce and adopt two-stage control rolling+controlled cooling model+normalizing treatment technique, its product yield strength is greater than 355MPa.
Publication number is " CN200980000058 ", denomination of invention is " steel for welded structures of hot strength and excellent in low temperature toughness and manufacture method thereof ", disclosing a kind of chemical composition is C:0.003 ~ 0.05%, Si:< 0.60%, Mn:0.6 ~ 2.0%, P: less than≤0.020%, S: less than≤0.010%, Cr:0.20 ~ 1.5%, Nb:0.005 ~ 0.05%, be heated to the temperature of 1000 ~ 1300 DEG C, temperature more than 800 DEG C terminates hot rolling, then cools.
Publication number is " CN200580024252 ", denomination of invention is " steel for welded structures of the excellent in low temperature toughness of welded heat affecting zone and manufacture method thereof ", and disclosing a kind of chemical composition is C:0.03% ~ 0.12%, Si:0.05% ~ 0.30%, Mn:1.2% ~ 3.0%, P :≤0.015%, S:0.001% ~ 0.015, Cu+Ni :≤0.10%, Ti:0.005% ~ 0.030%, Nb:0.005% ~ 0.10%.This molten steel is adopted Continuous casting process casting, and now cooling twice obtained strand from being set as 0.06 ~ 0.6 DEG C/s to the speed of cooling of 800 DEG C near zero pour, then hot rolling is carried out to strand, and begin to cool down from the temperature of more than 800 DEG C.
Visible, steel for welded structures is produced and mostly be with the addition of the expensive alloying element such as Cu, Cr, Ni, Nb, and portioned product adopts normalizing, tempering process, and production cost is higher.
Summary of the invention
First technical problem to be solved by this invention be to provide the good and processability of a kind of low cost, stable mechanical property, obdurability coupling, tensile strength 520MPa level that welding property is excellent think gauge containing vanadium welded construction hot continuous-milling steel plate.
A kind of think gauge is containing vanadium steel for welded structures, be made up of following weight percent composition: C:0.05 ~ 0.12%, Si :≤0.10%, Mn:1.05 ~ 1.50%, P :≤0.020%, S :≤0.015%, Ti:0.010 ~ 0.030%, V:0.06 ~ 0.10%, surplus is Fe and inevitable impurity.
Further, as preferred technical scheme, think gauge described above, containing vanadium steel for welded structures, is made up of following weight percent composition: C:0.07 ~ 0.11%, Si :≤0.08%, Mn:1.09 ~ 1.47%, P :≤0.018%, S :≤0.011%, Ti:0.013 ~ 0.026%, V:0.06 ~ 0.10%, surplus is Fe and inevitable impurity.
Think gauge described above contains vanadium steel for welded structures, the yield strength ReL >=365MPa of steel, tensile strength Rm:520 ~ 640MPa, unit elongation A >=24.0%, the ballistic work >=90J of-20 DEG C.
Second technical problem to be solved by this invention is to provide a kind of technique of controlled rolling and controlled cooling adopting low-temperature heat, low temperature rolling and aximal deformation value, prepares think gauge steel for welded structures.
Think gauge described above, containing the preparation method of vanadium steel for welded structures, comprises the following steps:
A, through desulfurizing iron, converter smelting, molten steel composition to be controlled within the scope of the percent composition of steel for welded structures described above;
B, by a step molten steel through continuous casting → roughing → finish rolling → cooling → curling key step, be prepared into finished product;
Wherein, continuous casting becomes the continuously cast bloom of 200 ~ 230mm, and slab, after 1200 ~ 1240 DEG C of soaking, adopts 3 ~ 7 passages to carry out roughing; Roughing becomes the thick intermediate blank of 40 ~ 60mm, finish rolling is carried out again through 4 ~ 7 frames, finishing temperature is 820 ~ 870 DEG C, 720 ~ 770 DEG C are quickly cooled to the speed of cooling of 10 ~ 30 DEG C/s, after air cooling 5 ~ 9s, batch in the temperature range being cooled to 580 ~ 640 DEG C again with the speed of cooling of 10 ~ 50 DEG C/s, obtain finished product, finished product thickness 12.5 ~ 22.0mm.
Further, as preferred technical scheme, the method prepared think gauge and contain vanadium steel for welded structures described above, wherein in b step, continuous casting becomes the continuously cast bloom of 200mm, slab is after 1200 DEG C of soaking, roughing becomes the thick intermediate blank of 48mm, and finishing temperature is 820 DEG C, is quickly cooled to 730 DEG C after finish rolling with the speed of cooling of 27 DEG C/s, after air cooling 5s, be cooled to 580 DEG C to batch with the cooling rate of 22 DEG C/s again, obtain finished product, finished product thickness 13.0mm.
The method prepared think gauge and contain vanadium steel for welded structures described above, the yield strength ReL:501MPa of Finished Steel, tensile strength Rm:575MPa, unit elongation A:24.0%, the ballistic work 92J of-20 DEG C.
The present invention, by adding vanadium, manganese as main alloy element, plays good precipitation strength and grain refining effect, and obtains ferrite+pearlitic structure by controlled rolling and controlled cooling in steel.
The present invention adopts low C, the chemical composition steel of middle Mn is produced, and carries out micro-vanadium process, namely adopts Mn-V microalloying mode, avoids noble elements such as adding Cu, Ni.Adopt cooling controlling and rolling controlling process, produce the 520MPa level think gauge steel for welded structures of ferrite+pearlitic structure, product has that intensity is high, the feature of the good and processability of stable mechanical property, obdurability coupling, welding property excellence.Steel grade cost of alloy of the present invention is low, rolling technology controls simple and adaptability is comparatively strong, has good popularizing application prospect.
Embodiment
A kind of think gauge is containing vanadium steel for welded structures, be made up of following weight percent composition: C:0.05 ~ 0.12%, Si :≤0.10%, Mn:1.05 ~ 1.50%, P :≤0.020%, S :≤0.015%, Ti:0.010 ~ 0.030%, V:0.06 ~ 0.10%, surplus is Fe and inevitable impurity.
Further, as preferred technical scheme, think gauge described above, containing vanadium steel for welded structures, is made up of following weight percent composition: C:0.07 ~ 0.11%, Si :≤0.08%, Mn:1.09 ~ 1.47%, P :≤0.018%, S :≤0.011%, Ti:0.013 ~ 0.026%, V:0.06 ~ 0.10%, surplus is Fe and inevitable impurity.
Think gauge described above contains vanadium steel for welded structures, the yield strength ReL >=365MPa of steel, tensile strength Rm:520 ~ 640MPa, unit elongation A >=24.0%, the ballistic work >=90J of-20 DEG C.
Think gauge described above, containing the preparation method of vanadium steel for welded structures, comprises the following steps:
A, through desulfurizing iron, converter smelting, molten steel composition to be controlled within the scope of the percent composition of steel for welded structures described above;
B, by a step molten steel through continuous casting → roughing → finish rolling → cooling → curling key step, be prepared into finished product;
Wherein, continuous casting becomes the continuously cast bloom of 200 ~ 230mm, and slab, after 1200 ~ 1240 DEG C of soaking, adopts 3 ~ 7 passages to carry out roughing; Roughing becomes the thick intermediate blank of 40 ~ 60mm, finish rolling is carried out again through 4 ~ 7 frames, finishing temperature is 820 ~ 870 DEG C, 720 ~ 770 DEG C are quickly cooled to the speed of cooling of 10 ~ 30 DEG C/s, after air cooling 5 ~ 9s, batch in the temperature range being cooled to 580 ~ 640 DEG C again with the speed of cooling of 10 ~ 50 DEG C/s, obtain finished product, finished product thickness 12.5 ~ 22.0mm.
Further, as preferred technical scheme, the method prepared think gauge and contain vanadium steel for welded structures described above, wherein in b step, continuous casting becomes the continuously cast bloom of 200mm, slab is after 1200 DEG C of soaking, roughing becomes the thick intermediate blank of 48mm, and finishing temperature is 820 DEG C, is quickly cooled to 730 DEG C after finish rolling with the speed of cooling of 27 DEG C/s, after air cooling 5s, be cooled to 580 DEG C to batch with the cooling rate of 22 DEG C/s again, obtain finished product, finished product thickness 13.0mm.
The method prepared think gauge and contain vanadium steel for welded structures described above, the yield strength ReL:501MPa of Finished Steel, tensile strength Rm:575MPa, unit elongation A:24.0%, the ballistic work 92J of-20 DEG C.
The present invention, by adding vanadium, manganese as main alloy element, plays good precipitation strength and grain refining effect, and obtains ferrite+pearlitic structure by controlled rolling and controlled cooling in steel.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
Chemical component weight per-cent is C:0.11%, Si:0.05%, Mn:1.47%, P:0.014%, S:0.005%, V:0.08%, Ti:0.017%, and surplus is Fe and inevitable impurity element composition; The thick continuous casting steel billet of 230mm is cast into conventional continuous cast method; Be heated to 1240 DEG C and carry out roughing, after roughing, intermediate slab thickness is at 58mm, and finished product thickness is 21.0mm; Finishing temperature is 860 DEG C; Be cooled to 760 DEG C with the cooling rate of 12 DEG C/s after finish rolling, after air cooling 8s, then be cooled to 630 DEG C to batch with the cooling rate of 10 DEG C/s; Its finished product mechanical property is yield strength 441MPa, tensile strength 531MPa, unit elongation 25.5%, the ballistic work 106J of-20 DEG C.
Embodiment 2
Chemical component weight per-cent is C:0.07%, Si:0.08%, Mn:1.09%, P:0.011%, S:0.004%, V:0.06%, Ti:0.026%, and surplus is Fe and inevitable impurity element composition; The thick continuous casting steel billet of 200mm is cast into conventional continuous cast method; Be heated to 1200 DEG C and carry out roughing, after roughing, intermediate slab thickness is at 48mm, and finished product thickness is 13.0mm; Finishing temperature is 820 DEG C; Be cooled to 730 DEG C with the cooling rate of 27 DEG C/s after finish rolling, after air cooling 5s, then be cooled to 580 DEG C to batch with the cooling rate of 22 DEG C/s; Its finished product mechanical property is yield strength 501MPa, tensile strength 575MPa, unit elongation 24.0%, the ballistic work 92J of-20 DEG C.
Embodiment 3
Chemical component weight per-cent is C:0.09%, Si:0.06%, Mn:1.36%, P:0.018%, S:0.011%, V:0.10%, Ti:0.013%, and surplus is Fe and inevitable impurity element composition; The thick continuous casting steel billet of 230mm is cast into conventional continuous cast method; Be heated to 1220 DEG C and carry out roughing, after roughing, intermediate slab thickness is at 53mm, and finished product thickness is 16.5mm; Finishing temperature is 830 DEG C; Be cooled to 750 DEG C with the cooling rate of 22 DEG C/s after finish rolling, after air cooling 6s, then be cooled to 600 DEG C to batch with the cooling rate of 17 DEG C/s; Its finished product mechanical property is yield strength 466MPa, tensile strength 561MPa, unit elongation 27.0%, the ballistic work 141J of-20 DEG C.
Claims (6)
1. a think gauge is containing vanadium steel for welded structures, it is characterized in that: be made up of following weight percent composition: C:0.05 ~ 0.12%, Si :≤0.10%, Mn:1.05 ~ 1.50%, P :≤0.020%, S :≤0.015%, Ti:0.010 ~ 0.030%, V:0.06 ~ 0.10%, surplus is Fe and inevitable impurity.
2. think gauge contains vanadium steel for welded structures according to claim 1, it is characterized in that: be made up of following weight percent composition: C:0.07 ~ 0.11%, Si :≤0.08%, Mn:1.09 ~ 1.47%, P :≤0.018%, S :≤0.011%, Ti:0.013 ~ 0.026%, V:0.06 ~ 0.10%, surplus is Fe and inevitable impurity.
3. according to claim 1 or 2, think gauge, containing vanadium steel for welded structures, is characterized in that: the yield strength ReL >=365MPa of steel, tensile strength Rm:520 ~ 640MPa, unit elongation A >=24.0%, the ballistic work >=90J of-20 DEG C.
4. prepare the method for think gauge described in any one of claims 1 to 3 containing vanadium steel for welded structures, it is characterized in that: comprise the following steps:
A, through desulfurizing iron, converter smelting, molten steel composition is controlled within the scope of the percent composition of steel for welded structures described in any one of claims 1 to 3;
B, by a step molten steel through continuous casting → roughing → finish rolling → cooling → curling key step, be prepared into finished product;
Wherein, continuous casting becomes the continuously cast bloom of 200 ~ 230mm, and slab, after 1200 ~ 1240 DEG C of soaking, adopts 3 ~ 7 passages to carry out roughing; Roughing becomes the thick intermediate blank of 40 ~ 60mm, finish rolling is carried out again through 4 ~ 7 frames, finishing temperature is 820 ~ 870 DEG C, 720 ~ 770 DEG C are quickly cooled to the speed of cooling of 10 ~ 30 DEG C/s, after air cooling 5 ~ 9s, batch in the temperature range being cooled to 580 ~ 640 DEG C again with the speed of cooling of 10 ~ 50 DEG C/s, obtain finished product, finished product thickness 12.5 ~ 22.0mm.
5. prepare the method for think gauge containing vanadium steel for welded structures according to claim 4, it is characterized in that: in b step, continuous casting becomes the continuously cast bloom of 200mm, slab is after 1200 DEG C of soaking, roughing becomes the thick intermediate blank of 48mm, and finishing temperature is 820 DEG C, is quickly cooled to 730 DEG C after finish rolling with the speed of cooling of 27 DEG C/s, after air cooling 5s, be cooled to 580 DEG C to batch with the cooling rate of 22 DEG C/s again, obtain finished product, finished product thickness 13.0mm.
6. prepare the method for think gauge containing vanadium steel for welded structures according to claim 5, it is characterized in that: the yield strength ReL:501MPa of Finished Steel, tensile strength Rm:575MPa, unit elongation A:24.0%, the ballistic work 92J of-20 DEG C.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110129669A (en) * | 2019-04-25 | 2019-08-16 | 首钢集团有限公司 | A kind of automobile tubulose trailing arm steel and preparation method thereof and steel pipe and preparation method thereof |
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| CN102337459A (en) * | 2011-10-31 | 2012-02-01 | 首钢总公司 | Steel for electric power tower and production method thereof |
| CN104109744A (en) * | 2014-07-28 | 2014-10-22 | 攀钢集团西昌钢钒有限公司 | Method for improving pipeline steel drop-weight performance |
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Patent Citations (3)
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| CN102321843A (en) * | 2011-09-21 | 2012-01-18 | 首钢总公司 | Zinc-plated communication pylon is with steel and working method thereof |
| CN102337459A (en) * | 2011-10-31 | 2012-02-01 | 首钢总公司 | Steel for electric power tower and production method thereof |
| CN104109744A (en) * | 2014-07-28 | 2014-10-22 | 攀钢集团西昌钢钒有限公司 | Method for improving pipeline steel drop-weight performance |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110129669A (en) * | 2019-04-25 | 2019-08-16 | 首钢集团有限公司 | A kind of automobile tubulose trailing arm steel and preparation method thereof and steel pipe and preparation method thereof |
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