CN106521337B - The method that slab flow produces transformation induced plasticity steel - Google Patents
The method that slab flow produces transformation induced plasticity steel Download PDFInfo
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- CN106521337B CN106521337B CN201611011549.6A CN201611011549A CN106521337B CN 106521337 B CN106521337 B CN 106521337B CN 201611011549 A CN201611011549 A CN 201611011549A CN 106521337 B CN106521337 B CN 106521337B
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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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
- C22C38/02—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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- Treatment Of Steel In Its Molten State (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention relates to the production methods of transformation induced plasticity steel, belong to plasticity steel production technical field.The method of the slab flow production transformation induced plasticity steel of the present invention includes the following steps：A. converter smelting；B. it taps；C.LF is refined；D. continuous casting；Wherein, the product chemical composition that continuous casting obtains is C in percentage by weight：0.25~0.29%, Si 1.40~1.60%, Mn：0.06 0.08%Als of 1.90~2.20%, P≤0.020%, S≤0.005%, Ti：0.020~0.060%, N：≤ 0.0060%, remaining is iron and inevitable impurity.The transformation induced plasticity steel impurity produced using this method is few, thus performance is good.
Description
Technical field
The present invention relates to the production methods of transformation induced plasticity steel, and in particular to slab flow produces transformation induced plasticity steel
Production method, belong to plasticity steel production technical field.
Background technology
Transformation induced plasticity steel has the spy that intensity is high, plasticity is good and work hardening rate is high compared to traditional high-strength steel
Point is suitable for the structure member of high formability.The composition design of traditional high Si or high Al of transformation induced plasticity steel generally use, to the greatest extent
The higher Si elements of pipe content or Al elements can effectively inhibit the precipitation of cementite, improve residual austenite content and stabilization
Property, be conducive to the elongation for improving steel plate, but then, Si elements can cause surface of steel plate to aoxidize, and influence surface of steel plate matter
Amount, while high silicon content can cause casting process slab bulge phenomenon to occur, Al also can inhibit or postpone cementite precipitation, because
This can improve surface quality using Al for Si, however since Al cannot provide solution strengthening effect identical with Si, it is reducing
Ms points can be also significantly improved while tensile property, reduce paralympic stability.In addition, with the development of industry, it is clean to molten steel
Cleanliness requirement is also higher, for example, climbing the transformation induced plasticity steel CR450 of steel exploitation, there is high cleanliness factor control to molten steel cleanness
Target processed, therefore more strict requirements, the production work of traditional transformation induced plasticity steel are proposed to refining and continuous casting working procedure
Skill can not meet above-mentioned requirements.
Application No. is 201210266845.6 Chinese patent applications to disclose a kind of transformation induced plasticity steel and its preparation
Method, chemical component weight percentage are respectively C：0.18%-0.21%, Si：10.5%-0.6%, Mn：1.8%-
2.0%, Nb：0.03%-0.04%, P≤0.01%, S≤0.01%, Alt：0.8%-1.0%, N≤0.005%, surplus are
Fe.Its solve the technical issues of be so that cold rolling hot dip galvanizing phase change induction plasticity steel on the basis of meeting design strength rank,
With better weldability and plasticity.To solve the above problems, which are added a large amount of Al to replace Si that can solve coating sex chromosome mosaicism,
But some strength can be weakened, in addition, the additive amount of its Si may be up to 10.5%, plate surface quality can be seriously affected.
Application No. is 201410174042.7 Chinese patent applications to disclose a kind of 1000MPa grades or more vanadium micro-alloying
Hot-rolled transformation induces plasticity steel and preparation method, and it includes C which, which induces plasticity steel by mass percentage,：0.18~
0.23%, Si≤0.50%, Mn：1.0~1.5%, V：0.16~0.20%, N：0.01~0.03%, and limit P≤
0.06%, S≤0.005%, surplus are Fe and other inevitable impurity.The V content that it is added is higher, and uses three sections
Formula cooling (section cooling → air-cooled → aerosol cooling), it is also necessary to stringent control cooling velocity and cooling temperature, complex process, and
And the requirement to equipment is very high, therefore cost is very high.
Application No. is 201110242071.9 Chinese patent applications to provide a kind of 800MPa grades of hot-rolled transformation induction plasticity
Steel plate and its manufacturing method, ingredient are：C：0.05%~0.3%, Si：≤ 0.5%, Mn：0.6%~3.0%, Als：
0.01%~0.08%, P：0.05%~0.1%, Nb：0.01%~0.1%, S ＜ 0.005%, remaining is Fe.It reduces Si and contains
While amount, a certain amount of P element is added, while adding appropriate Nb elements, by increasing Unhydrated cement reduction ratio and at end
Using simple cooling path after rolling, obtains intensity rank and reach the plasticity steel of 800MPa, but due to the addition of P element, can increase
The brittleness of steel, especially black brittleness.
Application No. is 200610118500.0 Chinese patent applications to disclose a kind of tensile strength 750MPa grades of hot rolling phases
Change induced plasticity steel and manufacturing method, 1) it smelts, be cast as base, ingredient percent is：C 0.08~0.20, Si≤
0.8, Mn 0.5~2.0, Al 0.8~2.5, Nb≤0.03, N≤0.010, P≤0.020, S≤0.008, Ca 0.001~
0.005, Yu Tie.Which are added a large amount of Al to replace Si that can solve coating sex chromosome mosaicism, but intensity is relatively low.
Invention content
Problem to be solved by this invention is to provide a kind of method of the slab flow production transformation induced plasticity steel of cleaning,
The transformation induced plasticity steel impurity produced using this method is few, thus performance is good.
In order to solve the above technical problems, the method for the slab flow production transformation induced plasticity steel of the present invention includes following step
Suddenly：
A. converter smelting：M kilograms of smelting molten steel, m ≠ 0 enter S≤0.003wt% of stove, converter terminal C content 0.05%
~0.09wt%；
B. it taps：Active lime 3~4kg/t steel is added in tapping process, 1~2kg/t steel corundum is added after tapping
Slag is to the top of the slag；
C.LF is refined：Small argon flow amount soft blow >=8min is used before LF molten steel is outbound, argon flow amount stirs not naked with molten steel
Subject to dew；
D. continuous casting：20 DEG C~35 DEG C of packet molten steel overheat in continuous casting, continuous casting come into operation slighter compress, 0.9~1.2m/ of target pull rate
min；
Wherein, the product chemical composition that continuous casting obtains is in percentage by weight：C：0.25~0.29%, Si 1.40
~1.60%, Mn：1.90~2.20%, P≤0.020%, S≤0.005%, Ti 0.06-0.08%Als：0.020~
0.060%, N：≤ 0.0060%, remaining is iron and inevitable impurity.
Further, the raw material of the converter smelting described in a steps can be the half steel after vanadium-titanium-iron-water vanadium extraction desulfurization.
Preferably, the material chemical component of the converter smelting described in a steps includes in percentage by weight：C：3.5-
4.2%, S≤0.005%, V：≤ 0.01%.
Preferably, the tapping temperature described in b step is 1660~1680 DEG C.
Preferably, the LF out-station temperatures described in step c are 1535~1555 DEG C.
Preferably, the small argon flow amount soft blow time 11min described in step c.
Preferably, the continuous casting described in Step d is poured into a mould using constant speed.
Preferably, the LF process target chemical ingredients described in Step d are in percentage by weight：C：0.26~
0.28%, Si 1.45~1.55%, Mn：1.95~2.15%, P≤0.015%, S≤0.003%, Ti 0.065-0.075%
Als：0.030~0.050%, N：≤ 0.0045%, remaining is iron and inevitable impurity.
Preferably, 22 DEG C~33 DEG C of packet molten steel overheat in the continuous casting described in Step d.
Beneficial effects of the present invention：The method of slab flow production transformation induced plasticity steel using the present invention, molten steel are clean
Cleanliness is high, and obtained product impurity is few, simple process and low cost；In addition, the aluminium that the present invention uses is micro, brittle phosphorus is reduced
Constituent content is also low, and obtained toughness of products is good, yield strength, tensile strength are high.
Specific implementation mode
The method of the slab flow production transformation induced plasticity steel of the present invention includes the following steps：
A. converter smelting：M kilograms of smelting molten steel, m ≠ 0 enter S≤0.005wt% of stove, converter terminal C content 0.05%
~0.09wt%；
B. it taps：Active lime 3~4kg/t steel is added in tapping process, 1~2kg/t steel corundum is added after tapping
Slag is to the top of the slag；
C.LF is refined：Small argon flow amount soft blow >=8min is used before LF molten steel is outbound, argon flow amount stirs not naked with molten steel
Subject to dew；
D. continuous casting：20 DEG C~35 DEG C of packet molten steel overheat in continuous casting, continuous casting come into operation slighter compress, 0.9~1.2m/ of target pull rate
min；
Wherein, the product chemical composition that continuous casting obtains is in percentage by weight：C：0.26~0.28%, Si 1.45
~1.55%, Mn：1.95~2.15%, P≤0.015%, S≤0.003%, Ti 0.065-0.075%Als：0.030~
0.050%, N：≤ 0.0045%, remaining is iron and inevitable impurity.
B step active lime and corundum slag can be conducive to remove sulphur impurity with rapid slagging.And slag phase is formed, it is added to
The corundum slag of the top of the slag can form Ca-Al slag system with lime reaction, and the slag system fusing point that the present invention is formed is relatively low, be conducive to desulfurization and
Removal is mingled with.
The flow of the small argon flow amount soft blow of step c is adjusted according to the scale of production, is stirred with molten steel and not exposed is
It is accurate.
Step d continuous casting comes into operation slighter compress, and 0.9~1.2m/min of target pull rate can improve center segregation and reduction center is dredged
The effect of pine.
The raw material of converter smelting described in a steps is preferably the half steel after vanadium-titanium-iron-water vanadium extraction desulfurization, containing suitable vanadium,
Vanadium can not still further be added.Solubility is very low at room temperature for vanadium in steel, usually with the C and N formation V (C, N) in steel, refines
Crystal grain improves toughness plasticity while strengthening matrix, but when content of vanadium is higher, and intensity can further increase, and toughness, especially
Impact flexibility can be remarkably decreased.
Preferably, the material chemical component of the converter smelting described in a steps includes in percentage by weight：C：3.5-
4.2%, S≤0.005%, V：≤ 0.01%.
Preferably, the tapping temperature described in b step is 1660~1680 DEG C.
Preferably, the LF out-station temperatures described in step c are 1535~1555 DEG C.
Preferably, the small argon flow amount soft blow time 11min described in step c.
Continuous casting described in Step d preferably uses constant speed to pour into a mould, and product can be allowed homogeneous, performance is good.
Preferably, the LF process target chemical ingredients described in Step d are in percentage by weight：：C：0.26~
0.28%, Si 1.45~1.55%, Mn：1.95~2.15%, P≤0.015%, S≤0.003%, Ti 0.065-0.075%
Als：0.030~0.050%, N：≤ 0.0045%, remaining is iron and inevitable impurity.
Preferably, 22 DEG C~33 DEG C of packet molten steel overheat in the continuous casting described in Step d.
The specific implementation mode of the present invention is further described with reference to embodiment, is not therefore limited the present invention
System is among the embodiment described range.
Embodiment 1
It carries out just making steel water using the half steel after hot metal containing V-Ti vanadium extraction desulfurization as raw material, wherein half steel percentage by weight
Than being calculated as 3.41% C, 0.041% Mn, 0.062% P, 0.002% S, 0.004% V and Cr, Si of trace
And Ti, surplus are iron and inevitable impurity.
A. converter smelting：231 tons of above-mentioned half steels are added in the top and bottom combined blown converter of 220 tons (nominal capacity), top is utilized
Above-mentioned half steel is just smelt molten steel by the function of bottom blown converter oxygen decarburization.It is 0.058wt%, Mn when molten steel is just refined to C content
When content is 0.032wt%, P content 0.0081wt%, S content is 0.0051wt%, temperature is 1671 DEG C, start dry slag to
It taps in ladle.
B. wash heat：Active lime 700Kg is added in tapping process, 300kg corundum slags are added after tapping.
C.LF is refined：Small argon flow amount soft blow 11min, soft blow process molten steel is used to stir not exposed, outbound temperature before outbound
Degree is 1545 DEG C, and chemical composition is shown in Table 1 after the fine tuning of LF process alloys.
D. continuous casting：22 DEG C~33 DEG C of packet molten steel overheat in continuous casting.
The inspection of finished product ingredient sample is shown in Table 2, and the mechanics properties testing of finished product is shown in Table 3.
Mass percent/% of ingredient after the fine tuning of 1 LF alloys of table
Mass percent/% of 2 finished product composition of steel of table
The mechanical property of 3 finished steel of table
Claims (24)
1. the method that slab flow produces transformation induced plasticity steel, it is characterised in that include the following steps：
A. converter smelting：M kilograms of smelting molten steel, m ≠ 0 enter S≤0.005wt% of stove, and converter terminal C content 0.05%~
0.09wt%；
B. it taps：Active lime 3~4kg/t steel is added in tapping process, 1~2kg/t steel corundum slag is added extremely after tapping
The top of the slag；
C.LF is refined：Small argon flow amount soft blow >=8min is used before LF molten steel is outbound, argon flow amount is stirred with molten steel not exposed is
It is accurate；
D. continuous casting：20 DEG C~35 DEG C of packet molten steel overheat in continuous casting, continuous casting come into operation slighter compress, 0.9~1.2m/min of target pull rate；
Wherein, the product chemical composition that continuous casting obtains is in percentage by weight：C：0.25~0.29%, Si 1.40~
1.60%, Mn：1.90~2.20%, P≤0.020%, S≤0.005%, Ti 0.06-0.08%, Als：0.020~
0.060%, N：≤ 0.0060%, remaining is iron and inevitable impurity.
2. the method for slab flow production transformation induced plasticity steel according to claim 1, which is characterized in that a steps institute
The raw material for the converter smelting stated is the half steel after vanadium-titanium-iron-water vanadium extraction desulfurization.
3. the method for slab flow production transformation induced plasticity steel according to claim 2, which is characterized in that a steps institute
The material chemical component for the converter smelting stated includes in percentage by weight：C：3.5-4.2%, S≤0.005%, V：≤
0.01%.
4. according to the method that claims 1 to 3 any one of them slab flow produces transformation induced plasticity steel, feature exists
In the tapping temperature described in b step is 1660~1680 DEG C.
5. according to the method that claims 1 to 3 any one of them slab flow produces transformation induced plasticity steel, feature exists
In the LF out-station temperatures described in step c are 1535~1555 DEG C.
6. the method for slab flow production transformation induced plasticity steel according to claim 4, which is characterized in that step c institute
The LF out-station temperatures stated are 1535~1555 DEG C.
7. according to the method that claims 1 to 3,6 any one of them slab flows produce transformation induced plasticity steel, feature exists
In the small argon flow amount soft blow time 11min described in step c.
8. the method for slab flow production transformation induced plasticity steel according to claim 4, which is characterized in that step c institute
The small argon flow amount soft blow time 11min stated.
9. the method for slab flow production transformation induced plasticity steel according to claim 5, which is characterized in that step c institute
The small argon flow amount soft blow time 11min stated.
10. according to the method that claims 1 to 3,6,8~9 any one of them slab flows produce transformation induced plasticity steel,
It is characterized in that, the continuous casting described in Step d is poured into a mould using constant speed.
11. the method for slab flow production transformation induced plasticity steel according to claim 4, which is characterized in that Step d institute
The continuous casting stated is poured into a mould using constant speed.
12. the method for slab flow production transformation induced plasticity steel according to claim 5, which is characterized in that Step d institute
The continuous casting stated is poured into a mould using constant speed.
13. the method for slab flow production transformation induced plasticity steel according to claim 7, which is characterized in that Step d institute
The continuous casting stated is poured into a mould using constant speed.
14. producing transformation induced plasticity steel according to claims 1 to 3,6,8~9,11~13 any one of them slab flows
Method, which is characterized in that the LF process target chemical ingredients described in Step d are in percentage by weight：C：0.26~
0.28%, Si 1.45~1.55%, Mn：1.95~2.15%, P≤0.015%, S≤0.003%, Ti 0.065-0.075%
Als：0.030~0.050%, N：≤ 0.0045%, remaining is iron and inevitable impurity.
15. the method for slab flow production transformation induced plasticity steel according to claim 4, which is characterized in that Step d institute
The LF process target chemical ingredients stated are in percentage by weight：C：0.26~0.28%, Si 1.45~1.55%, Mn：
1.95~2.15%, P≤0.015%, S≤0.003%, Ti 0.065-0.075%Als：0.030~0.050%, N：≤
0.0045%, remaining is iron and inevitable impurity.
16. the method for slab flow production transformation induced plasticity steel according to claim 5, which is characterized in that Step d institute
The LF process target chemical ingredients stated are in percentage by weight：C：0.26~0.28%, Si 1.45~1.55%, Mn：
1.95~2.15%, P≤0.015%, S≤0.003%, Ti 0.065-0.075%Als：0.030~0.050%, N：≤
0.0045%, remaining is iron and inevitable impurity.
17. the method for slab flow production transformation induced plasticity steel according to claim 7, which is characterized in that Step d institute
The LF process target chemical ingredients stated are in percentage by weight：C：0.26~0.28%, Si 1.45~1.55%, Mn：
1.95~2.15%, P≤0.015%, S≤0.003%, Ti 0.065-0.075%Als：0.030~0.050%, N：≤
0.0045%, remaining is iron and inevitable impurity.
18. the method for slab flow production transformation induced plasticity steel according to claim 10, which is characterized in that Step d
The LF process target chemical ingredients are in percentage by weight：C：0.26~0.28%, Si 1.45~1.55%, Mn：
1.95~2.15%, P≤0.015%, S≤0.003%, Ti 0.065-0.075%Als：0.030~0.050%, N：≤
0.0045%, remaining is iron and inevitable impurity.
19. phase-change induced according to claims 1 to 3, the production of 6,8~9,11~13,15~18 any one of them slab flows
The method of plasticity steel, which is characterized in that 22 DEG C~33 DEG C of packet molten steel overheat in the continuous casting described in Step d.
20. the method for slab flow production transformation induced plasticity steel according to claim 4, which is characterized in that Step d institute
22 DEG C~33 DEG C of packet molten steel overheat in the continuous casting stated.
21. the method for slab flow production transformation induced plasticity steel according to claim 5, which is characterized in that Step d institute
22 DEG C~33 DEG C of packet molten steel overheat in the continuous casting stated.
22. the method for slab flow production transformation induced plasticity steel according to claim 7, which is characterized in that Step d institute
22 DEG C~33 DEG C of packet molten steel overheat in the continuous casting stated.
23. the method for slab flow production transformation induced plasticity steel according to claim 10, which is characterized in that Step d
22 DEG C~33 DEG C of packet molten steel overheat in the continuous casting.
24. the method for slab flow production transformation induced plasticity steel according to claim 14, which is characterized in that Step d
22 DEG C~33 DEG C of packet molten steel overheat in the continuous casting.
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| CN103866185A (en) * | 2014-03-14 | 2014-06-18 | 莱芜钢铁集团有限公司 | Preparation method for manufacturing low-cost ultrafine grain transformation-induced plastic steel seamless tube online |
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2016
- 2016-11-17 CN CN201611011549.6A patent/CN106521337B/en active Active
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|---|---|---|---|---|
| EP1072689A1 (en) * | 1999-07-30 | 2001-01-31 | Usinor | Process of manufacturing thin "TRIP" type steel strips and strips obtained thereby |
| CN102260822A (en) * | 2011-07-27 | 2011-11-30 | 攀钢集团有限公司 | High-phosphorus low-sulfur non-oriented electrical steel and smelting method thereof |
| CN102407245A (en) * | 2011-10-28 | 2012-04-11 | 东北大学 | Method for producing transformation induced plasticity (TRIP) seamless tube |
| CN102952996A (en) * | 2013-01-04 | 2013-03-06 | 鞍钢股份有限公司 | High-elongation cold-rolled TRIP steel plate and preparation method thereof |
| CN103555886A (en) * | 2013-11-11 | 2014-02-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting ultralow-sulfur steel by using vanadium-containing molten iron |
| CN103866185A (en) * | 2014-03-14 | 2014-06-18 | 莱芜钢铁集团有限公司 | Preparation method for manufacturing low-cost ultrafine grain transformation-induced plastic steel seamless tube online |
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| CN106521337A (en) | 2017-03-22 |
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