CN101161843A - Method for improving utilization ratio of V-N micro-alloying high-strength steel vanadium alloy - Google Patents
Method for improving utilization ratio of V-N micro-alloying high-strength steel vanadium alloy Download PDFInfo
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Abstract
The invention discloses a method for improving the utility ratio of V-N micro-alloying high strength steel vanadium alloy, which aims at molten steel chemical composition range of V-N micro alloy high strength steel to control the V/N ratio within more than or equal to 4 and less than or equal to 6. The separation quantity of vanadium carbonitride in V-N micro-alloying high strength steel is increased through controlling the V/N ratio, thereby reducing using amount of alloy element V and improving the alloy utility ratio of V. The invention has the advantages that: the manufacturing process is easy to control, the comprehensive performances of steel plate can be stably acquired and simultaneously the adding quantity of vanadium can be reduced by 35 percent to 50 percent through controlling V/N ratio, thereby reducing alloying production cost and improving competitive strength of products.
Description
Technical field
The invention belongs to the low alloy steel production technical field, particularly improve the method for V-N micro-alloying high-strength steel vanadium alloy utilization ratio based on bar strip continuous casting and rolling flow path.
Background technology
The V-N micro-alloying technology is a key areas of producing High-Strength Low-Alloy and micro-alloyed steel at present.The CSP enterprise of North America extensively adopts V-N micro-alloying technology production Hi-Stren steel.Zhujiang Iron and Steel Co Ltd, Guangzhou's (hereinafter to be referred as pearl steel) article one sheet billet continuous casting and rolling production line has been developed the technology (number of patent application: 200510100421.2), produce the method (number of patent application: 200610035800.2) of Yield strength 700 MPa grade V-N microalloyed high-strength air corrosion-resistant steel based on continuous casting and rolling technique of sheet bar of producing the V-N micro alloy high strength steel band based on continuous casting and rolling technique of sheet bar.Wherein number of patent application 200510100421.2 at molten steel chemical ingredients scope be (Wt.%): C:0.03～0.08Wt.%; Si:0.01～0.8Wt.%; Mn:0.1～2.0Wt.%; V:0.01-0.20Wt.%; Alt:0.010～0.06Wt.%; N:0.002～0.03Wt.%. Number of patent application 200610035800.2 at molten steel chemical ingredients scope be (Wt.%): C :≤0.08Wt.%; Si:0.25～0.75Wt.%; Mn:0.8～2.0Wt.%; P:0.070～0.150Wt.%; S :≤0.040Wt.%; Cu:0.25～0.60Wt.%; Cr:0.30～1.25Wt.%; Ni :≤0.65Wt.%; V:0.05～0.20Wt.%; N:0.015～0.030Wt.%.
The pearl steel is through in a few years production practice, in order further to improve the over-all properties of V-N micro-alloying high-strength steel, improve unit elongation, cold-bending property, the low-temperature impact toughness of steel, and then improve the performance that shapes of V-N micro-alloying high-strength steel, V/N in steel ratio is controlled, made product performance better.
The notion of V/N ratio is not proposed at present both at home and abroad as yet.VN has the crystalline structure of NaCl type, can think that N has occupied all interstitial sites of vanadium face-centerd cubic structure fully.VN and austenite all are face-centred cubic structures, and the precipitate in the vanadium micro-alloyed steel austenite is pure VN, till N exhausts; When N was tending towards exhausting, precipitate had a gradual change to carbonitride; The carbon vanadium nitride of rich N can be at austenite in the ferritic transformation process or separate out subsequently.Therefore, can promote to contain the precipitation precipitation strength of vanadium steel greatly with nitrogen.Along with the increase of N content, it is more and more littler that deposit seeds becomes, and quantity constantly increases.The increase of N content can also promote the nucleation of deposit seeds, prevents the particle alligatoring.
The molecular chemistry proportioning V/N=50.9415/14.0067=3.637 of vanadium nitrogen among the VN.The pearl steel is given full play to the effect of N in actual mechanical process, when the high-strength steel of production phase intensity rank, by improving V/N than the consumption 35～50% that can lower V, thereby reach the purpose that improves the vanadium alloy utilization ratio, reduced the cost of product, improved economic benefit of enterprises.
Summary of the invention
The method that the purpose of this invention is to provide a kind of V-N of raising micro-alloying high-strength steel vanadium alloy utilization ratio improves the utilization ratio of vanadium alloy by the scope of controlling the V/N ratio, has reduced the cost of product, has improved economic benefit of enterprises.
Purpose of the present invention is achieved by taking following technical scheme:
A kind of method that improves V-N micro-alloying high-strength steel vanadium alloy utilization ratio, it is characterized in that producing the V-N micro-alloying high-strength steel adopts and directly to enter roller bottom type heating or soaking pit, hot rolling, laminar flow cooling, coiling technique flow process behind electric furnace or converter smelting, refining, sheet blank continuous casting, the casting blank solidification, molten steel chemical ingredients scope at the V-N micro-alloying high-strength steel, the V/N ratio is controlled at 4≤V/N≤6, by the separate out amount of control V/N than carbon vanadium nitride in the raising V-N micro-alloying high-strength steel, reduce the consumption of alloying element V, improve the alloy utilization ratio of V.
As further optimization of the present invention, the molten steel chemical ingredients scope at the V-N micro-alloying high-strength steel is controlled at 4≤V/N≤5 with the V/N ratio, and V/N is lower than more in control, and is good more to performance, and it is good more to improve the vanadium alloy utilization ratio.
The molten steel chemical ingredients scope of the V-N microalloy High Strength Construction Steel that the present invention is directed to is: C:0.03～0.08Wt.%; Si:0.01～0.8Wt.%; Mn:0.1～2.0Wt.%; V:0.01-0.20Wt.%; Alt:0.010～0.06Wt.%; N:0.002～0.03Wt.%.Molten steel chemical ingredients scope at V-N microalloy high-strength weathering steel is: C :≤0.08Wt.%; Si:0.25～0.75Wt.%; Mn:0.8～2.0Wt.%; P :≤0.040Wt.%; S :≤0.040Wt.%; Cu:0.25～0.60Wt.%; Cr:0.30～1.25Wt.%; Ni :≤0.65Wt.%; V:0.05～0.20Wt.%; N:0.015～0.030Wt.%.
The present invention than the amount of separating out that improves carbon vanadium nitride in the V-N micro-alloying high-strength steel, controls the size of precipitate and the consumption that quantity can reduce alloying element V by control V/N, improves the alloy utilization ratio of V.Therefore one of key of this method is that the V/N ratio is rationally controlled, and effectively improves V in the steel (C, the amount of separating out N).
The invention has the advantages that, when producing other high-strength steel of equality strength level, than the over-all properties that can stably obtain steel plate, can reduce the addition of 35～50% vanadium simultaneously, the alloying production cost is lowered, the raising product competitiveness by control V/N.
Embodiment
The specific embodiment of below enumerating is used for that the present invention will be described.Embodiment only is used for that the invention will be further described, does not represent protection scope of the present invention, and nonessential modification and adjustment that other people make according to the present invention still belong to protection scope of the present invention.
Embodiment 1
Molten steel chemical ingredients: 0.045%C-0.45%Si-1.65%Mn-0.015%P-0.004%S-0.27%Cu-0.18%Ni-0.65%Cr-0.100%V-0.025%Alt-0.025%N.V/N is than control: V/N=4.
Technology: strand charging temperature: 950～1000 ℃; Soaking temperature: 1140～1160 ℃; 1050～1100 ℃ of start rolling temperatures; Finishing temperature: 860～880 ℃; Coiling temperature: 580～620 ℃.
The grain fineness number and the mechanical property of steel band see Table 1.
The grain-size and the mechanical property of table 1 embodiment 1 steel band
| Thickness of strips mm | Grain-size μ m | Rel MPa | Rm Mpa | A ％ | Wide clod wash b=35mm, 180 ° of d=1.5a |
| 1.8 | 3.8 | 745 | 830 | 21 | Intact |
| 2.5 | 3.9 | 730 | 815 | 23 | Intact |
| 3.2 | 3.5 | 745 | 820 | 21 | Intact |
| 4.0 | 4.1 | 725 | 795 | 25 | Intact |
| 6.0 | 3.8 | 720 | 805 | 24 | Intact |
| 8.0 | 4.1 | 735 | 815 | 25 | Intact |
This steel is the 700MPa grade high-strength weathering steel, before control V/N ratio, Composition Control is 0.150%V-0.020%N, and V/N is than=7.5, improve V/N, produce consumption (0.150%-0.100%)/0.100%=50% that other high-strength weathering steel of equality strength level can lower V.
Embodiment 2
Molten steel chemical ingredients: 0.06%C-0.25%Si-1.6%Mn-0.020%P-0.003%S-0.120%V-0.035%Alt-0.024%N.V/N is than control: V/N=5.
Technology: strand charging temperature: 900～950 ℃; Soaking temperature: 1100～1130 ℃; 1000～1100 ℃ of start rolling temperatures; Finishing temperature: 840～860 ℃; Coiling temperature: 580～600 ℃.
The grain fineness number and the mechanical property of steel band see Table 2.
The grain-size and the mechanical property of table 2 embodiment 2 steel bands
| Thickness of strips mm | Grain-size μ m | Rel MPa | Rm MPa | A ％ | Wide clod wash b=35mm, 80 ° of d=a |
| 1.8 | 2.5 | 710 | 820 | 23 | Intact |
| 3.2 | 2.8 | 720 | 790 | 23 | Intact |
| 6.0 | 2.7 | 705 | 800 | 22 | Intact |
| 8.0 | 2.9 | 700 | 780 | 20 | Intact |
This steel is a 700MPa level High Strength Construction Steel, before control V/N ratio, Composition Control is 0.170%V-0.020%N, and V/N is than=8.5, improve V/N, produce consumption (0.170%-0.120%)/0.120%=41.7% that other high-strength weathering steel of equality strength level can lower V.
Embodiment 3
Molten steel chemical ingredients: 0.055%C-0.015%Si-1.2%Mn-0.008%P-0.004%S-0.085%V-0.025%Al t-0.015%N.V/N is than control: V/N=6.
Technology: strand charging temperature: 950～1000 ℃; Soaking temperature: 1100～1140 ℃; 1000～1100 ℃ of start rolling temperatures; Finishing temperature: 840～860 ℃; Coiling temperature: 550～600 ℃.
The grain fineness number and the mechanical property of steel band see Table 3.
The grain-size and the mechanical property of table 3 embodiment 3 steel bands
| Thickness of strips mm | Grain-size μ m | Rel MPa | Rm MPa | A ％ | Wide clod wash b=35mm, 180 ° of d=a |
| 1.8 | 4.1 | 540 | 630 | 29 | Intact |
| 3.2 | 4.3 | 520 | 625 | 29 | Intact |
| 6.0 | 4.6 | 510 | 610 | 27 | Intact |
| 12.0 | 4.4 | 515 | 615 | 24 | Intact |
This steel is a 500MPa level High Strength Construction Steel, before control V/N ratio, Composition Control is 0.115%V-0.012%N, and V/N is than=9.6, improve V/N, produce consumption (0.115%-0.085%)/0.085%=35.3% that other high-strength weathering steel of equality strength level can lower V.
Claims (4)
1. method that improves V-N micro-alloying high-strength steel vanadium alloy utilization ratio, it is characterized in that producing the V-N micro-alloying high-strength steel and adopt electric furnace or converter smelting, refining, sheet blank continuous casting, directly enter roller bottom type heating or soaking pit behind the casting blank solidification, hot rolling, the laminar flow cooling, the coiling technique flow process, molten steel chemical ingredients scope at the V-N micro-alloying high-strength steel, the V/N ratio is controlled at 4≤V/N≤6, by the separate out amount of control V/N than carbon vanadium nitride in the raising V-N micro-alloying high-strength steel, reduce the consumption of alloying element V, improve the alloy utilization ratio of V.
2. method according to claim 1 is characterized in that the molten steel chemical ingredients scope at the V-N micro-alloying high-strength steel, and the V/N ratio is controlled at 4≤V/N≤5.
3. method according to claim 1 and 2, it is characterized in that at the molten steel chemical ingredients scope of V-N microalloy High Strength Construction Steel be: C:0.03～0.08Wt.%; Si:0.01～0.8Wt.%; Mn:0.1～2.0Wt.%; V:0.01-0.20Wt.%; Alt:0.010～0.06Wt.%; N:0.002～0.03Wt.%.
4. method according to claim 1 and 2, it is characterized in that at the molten steel chemical ingredients scope of V-N microalloy high-strength weathering steel be: C :≤0.08Wt.%; Si:0.25～0.75Wt.%; Mn:0.8～2.0Wt.%; P :≤0.040Wt.%; S :≤0.040Wt.%; Cu:0.25～0.60Wt.%; Cr:0.30～1.25Wt.%; Ni :≤0.65Wt.%; V:0.05～0.20Wt.%; N:0.015～0.030Wt.%.
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| CN102534367A (en) * | 2011-12-02 | 2012-07-04 | 北京科技大学 | Steel for superhigh-strength hot rolling automobile structure and preparation method thereof |
| CN103014491A (en) * | 2012-12-21 | 2013-04-03 | 首钢总公司 | 600MPa low-alloy and high-strength ultra-thick steel plate and producing method thereof |
| CN104195409A (en) * | 2014-09-01 | 2014-12-10 | 武汉钢铁(集团)公司 | Method for enhancing strength and toughness of medium-carbon V steel |
| CN106676421A (en) * | 2015-11-06 | 2017-05-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten steel of atmospheric corrosion resistant steel and titanium-nitrogen containing atmospheric corrosion resistant steel and production method thereof |
| CN106676425A (en) * | 2015-11-06 | 2017-05-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Chrome and niobium contained atmosphere corrosion resistant section steel molten steel, atmosphere corrosion resistant section steel and production method of atmosphere corrosion resistant section steel |
| CN106676424A (en) * | 2015-11-06 | 2017-05-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Atmosphere corrosion resistant section steel molten steel, vanadium and niobium contained atmosphere corrosion resistant section steel and production method of vanadium and niobium contained atmosphere corrosion resistant section steel |
| CN111020393A (en) * | 2020-01-11 | 2020-04-17 | 武钢集团昆明钢铁股份有限公司 | Preparation method of nitrogen-rich vanadium microalloyed large-sized anti-seismic reinforcing steel bar |
| WO2020211137A1 (en) | 2019-04-16 | 2020-10-22 | 江阴兴澄特种钢铁有限公司 | R6 high toughness offshore mooring chain steel applicable to anchor moored positioning cathodic protection floating body and mooring chain thereof |
| CN114657479A (en) * | 2022-05-11 | 2022-06-24 | 马鞍山钢铁股份有限公司 | Thick-gauge high-strength hot-rolled corrosion-resistant steel with excellent low-temperature toughness and manufacturing method and application thereof |
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- 2007-11-21 CN CNA200710031550XA patent/CN101161843A/en active Pending
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| CN102534367A (en) * | 2011-12-02 | 2012-07-04 | 北京科技大学 | Steel for superhigh-strength hot rolling automobile structure and preparation method thereof |
| CN103014491A (en) * | 2012-12-21 | 2013-04-03 | 首钢总公司 | 600MPa low-alloy and high-strength ultra-thick steel plate and producing method thereof |
| CN104195409A (en) * | 2014-09-01 | 2014-12-10 | 武汉钢铁(集团)公司 | Method for enhancing strength and toughness of medium-carbon V steel |
| CN106676421A (en) * | 2015-11-06 | 2017-05-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Molten steel of atmospheric corrosion resistant steel and titanium-nitrogen containing atmospheric corrosion resistant steel and production method thereof |
| CN106676425A (en) * | 2015-11-06 | 2017-05-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Chrome and niobium contained atmosphere corrosion resistant section steel molten steel, atmosphere corrosion resistant section steel and production method of atmosphere corrosion resistant section steel |
| CN106676424A (en) * | 2015-11-06 | 2017-05-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Atmosphere corrosion resistant section steel molten steel, vanadium and niobium contained atmosphere corrosion resistant section steel and production method of vanadium and niobium contained atmosphere corrosion resistant section steel |
| CN106676421B (en) * | 2015-11-06 | 2019-03-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Atmosphere corrosion resistance structural steel molten steel and titaniferous nitrogen atmosphere corrosion resistance structural steel and its production method |
| CN106676424B (en) * | 2015-11-06 | 2019-04-02 | 攀钢集团攀枝花钢铁研究院有限公司 | Atmosphere corrosion resistance structural steel molten steel and the atmosphere corrosion resistance structural steel of niobium containing vanadium and its production method |
| WO2020211137A1 (en) | 2019-04-16 | 2020-10-22 | 江阴兴澄特种钢铁有限公司 | R6 high toughness offshore mooring chain steel applicable to anchor moored positioning cathodic protection floating body and mooring chain thereof |
| CN111020393A (en) * | 2020-01-11 | 2020-04-17 | 武钢集团昆明钢铁股份有限公司 | Preparation method of nitrogen-rich vanadium microalloyed large-sized anti-seismic reinforcing steel bar |
| CN111020393B (en) * | 2020-01-11 | 2021-05-18 | 武钢集团昆明钢铁股份有限公司 | Preparation method of nitrogen-rich vanadium microalloyed HRB600 ultrafine grain anti-seismic steel bar |
| CN114657479A (en) * | 2022-05-11 | 2022-06-24 | 马鞍山钢铁股份有限公司 | Thick-gauge high-strength hot-rolled corrosion-resistant steel with excellent low-temperature toughness and manufacturing method and application thereof |
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