CN103397281A - High-strength steel and preparation method thereof - Google Patents
High-strength steel and preparation method thereof Download PDFInfo
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- CN103397281A CN103397281A CN201310361025XA CN201310361025A CN103397281A CN 103397281 A CN103397281 A CN 103397281A CN 201310361025X A CN201310361025X A CN 201310361025XA CN 201310361025 A CN201310361025 A CN 201310361025A CN 103397281 A CN103397281 A CN 103397281A
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Abstract
The invention discloses a kind of high-strength steel and a preparation method thereof, and aims to provide steel with good toughness and high strength and a preparation method thereof. The high-strength steel comprises following components in percentage by weight: 0.20 to 0.25% of C, 1.20 to 1.50% of Mn, 0.45 to 0.60% of Si, 0.05 to 0.12% of V, not more than 0.045% of P, not more than 0.045% of S, and the balance being Fe. The preparation method comprises following steps: (1) melting waste steel at the temperature of 1530 to 1650 DEG C, detecting and adjusting the contents of C, Mn, Si, P and S; (2) reducing oxygen content and gas content by alternately adopting precipitation deoxidation and diffusion deoxidation at the temperature of 1580 to 1630 DEG C and a vacuum degree of 20 ppm, and detecting and adjusting the element contents again so as to obtain the product. The invention belongs to the field of steel production.
Description
Technical field
The invention discloses a kind of iron and steel, specifically, is a kind of high strength iron and steel, and the present invention also discloses the preparation method of this high strength iron and steel, belongs to steel and manufactures field.
Background technology
Along with the fast development of the industry of building, the building iron and steel has become the kind of steel product consumption maximum.Accounted at present more than 20% of China's steel ultimate production.Along with appearance high-rise, the long span building structure, not only require reinforcing bar to have higher intensity, but also have good toughness, meet the property of shockproof requirements.And China's building iron 80% is all HRB335 at present, the reinforcing bar of the HRB400 trade mark, and these intensity are low and use the density of arranging large, and the resource serious waste, be unfavorable for social sustainable development.At present, the reason that the intensity of reinforcing bar and toughness are undesirable, be because intensity and the toughness of iron and steel in its starting material are inadequate, develops the focus that a kind of toughness is good, intensity is higher iron and steel has become scholar's research.
Summary of the invention,
For above-mentioned deficiency, the object of the present invention is to provide iron and steel that a kind of toughness is good, intensity is higher and preparation method thereof.
For solving the problems of the technologies described above, last technical scheme provided by the invention is such: this high strength iron and steel comprises the composition of following mass percent: C0.20～0.25%, Mn1.20～1.50%, Si0.45～0.60%, V0.05～0.12%, P<=0.045%, S<=0.045%, surplus is Fe.
After provided by the invention, a technical scheme is such: the method for this high strength iron and steel comprises the steps: successively
1) at 1530～1650 ℃ by the wastes of iron and steel melting, detect and regulate C, Mn, Si, P, each constituent content of S, each constituent content is met: C<=0.25%, Mn<=1.60%, Si<=0.80%, P<=0.045%, S<=0.045%;
2) at 1580～1630 ℃, under 20ppm vacuum tightness, alternately adopt above oxygen level and the gas content of reducing of bulk deoxidation method and diffusive deoxidation method deoxidation 30min, again detect and adjust each constituent content, make each constituent content scope exist: C0.20～0.25%, Mn1.20～1.50%, Si0.45～0.60%, V0.05～0.12%, P<=0.045%, S<=0.045%.
Further, the above-mentioned method for preparing the high strength iron and steel, each constituent content of described detection adopts spectrum in-line analysis instrument.
Further, the above-mentioned method for preparing the high strength iron and steel, described diffusive deoxidation method is from the ladle bottom Stirring by Ar Blowing.
Compared with prior art, technical scheme provided by the invention, the present invention adopts wastes of iron and steel by the control of liquid steel refining and chemical composition C, Mn, Si, P, S, V, and wherein V content is 0.05～0.12%, effectively improved the over-all properties of product, made this iron and steel dense structure; Increase the operation of vanadium iron microalloying, give full play to the effect of vanadium precipitation strength and crystal grain thinning in steel, improve the antifatigue comprehensive mechanical performance, and make reinforcing bar that good welding property be arranged.Prepare the iron and steel of high strength, high tenacity, yield strength is greater than 630MPa, and tensile strength is greater than 810MPa, unit elongation is greater than 17%, minimizing is at the steel using amount 20%-40% of building trade same function and equal floor area of building, and energy-saving and emission-reduction, improved economic benefit and the social benefit of enterprise.
Embodiment
Below in conjunction with embodiment; claim of the present invention is described in further detail; but become not any limitation of the invention, the modification of anyone makes in the claims in the present invention scope limited number of time, still at claim protection domain of the present invention.
A kind of high strength iron and steel provided by the invention comprises the composition of following mass percent: C0.20～0.25%, and Mn1.20～1.50%, Si0.45～0.60%, V0.05～0.12%, surplus is Fe.
The method of this high strength iron and steel, comprise the steps: successively
1) at 1530～1650 ℃ by the wastes of iron and steel melting, detect C, Mn, Si, P, each constituent content of S, each constituent content is met: C<=0.25%, Mn<=1.60%, Si<=0.80%, P<=0.045%, S<=0.045%, if not in this scope, regulate by the amount that increases alloy, make it meet above-mentioned scope, obtain crude iron water;
2) the crude iron water that step 1) is obtained is at 1580～1630 ℃, under 20PPm vacuum tightness, alternately adopt bulk deoxidation method and the deoxidation of diffusive deoxidation method 30 minutes with on reduce oxygen level and gas content, wherein said diffusive deoxidation method is from the ladle bottom Stirring by Ar Blowing, make gas and impurity thing floating by a relatively large margin in iron and steel, again detect and adjust each constituent content, make each constituent content scope exist: C0.20～0.25%, Mn1.20～1.50%, Si0.45～0.60%, V0.05～0.12%, get product
When wherein, each element detects, adopt spectrum in-line analysis instrument.
Embodiment 1
take 40 tons of steel scraps and put into after the heating of thick furnace dissolves, the test of spectrum in-line analysis instrument is adopted in sampling, and composition is C0.23%, Mn1.10%, Si0.44%, P0.022%, S0.028%, according to detected result, add 240 kilograms of silicomanganeses, 110 kilograms of ferrosilicon, 65 kilograms of vanadium iron, making each constituent content is C0.23%, Mn1.45%, Si0.64%, the crude molten steel of V0.08%, again at 1620 ℃-1650 ℃, under 20PPm vacuum tightness, alternately adopt bulk deoxidation method and the deoxidation of diffusive deoxidation method to reduce oxygen level and gas content in 30 minutes, wherein, described diffusive deoxidation method is from the ladle bottom Stirring by Ar Blowing, make gas and impurity thing floating by a relatively large margin in iron and steel, sub-sampling again, adopt spectrum in-line analysis instrument to test each elemental composition: C0.23%, Mn1.47%, Si0.65%, P0.020%, S0.026%, V0.08%, be qualified finished product.
Embodiment 2
take 40 tons of steel scraps and put into after the heating of thick furnace dissolves, the test of spectrum in-line analysis instrument is adopted in sampling, and composition is C0.21%, Mn1.20%, Si0.40%, P0.025%, S0.030%, according to detected result, add 135 kilograms of silicomanganeses, 110 kilograms of ferrosilicon, 58 kilograms of vanadium iron, making each constituent content is C0.22%, Mn1.40%, Si0.60%, the crude molten steel of V0.08%, again at 1550 ℃-1620 ℃, under 20PPm vacuum tightness, alternately adopt bulk deoxidation method and diffusive deoxidation method deoxidation 1h to reduce oxygen level and gas content, wherein bulk deoxidation method and diffusive deoxidation method single operation time are 15min, described diffusive deoxidation method is from the ladle bottom Stirring by Ar Blowing, make gas and impurity thing floating by a relatively large margin in iron and steel, sub-sampling again, adopting spectrum in-line analysis instrument test composition is C0.22%, Mn1.43%, Si0.65%, P0.026%, S.033%, V0.07%, be qualified finished product.
Embodiment 3
take 40 tons of steel scraps and put into after the heating of thick furnace dissolves, the test of spectrum in-line analysis instrument, composition C0.22%, Mn1.05%, Si0.45%, P0.028%, S0.035% are adopted in sampling, according to detected result, add 170 kilograms of silicomanganeses, 115 kilograms of ferrosilicon, 65 kilograms of vanadium iron, making each constituent content is C0.25%, Mn1.46%, Si0.66%, the crude molten steel of V0.08%, again at 1530-1550 ℃, under 20PPm vacuum tightness, alternately adopt bulk deoxidation method and diffusive deoxidation method deoxidation 30min to reduce oxygen level and gas content, wherein, described diffusive deoxidation method is from the ladle bottom Stirring by Ar Blowing, make gas and impurity thing floating by a relatively large margin in iron and steel, sub-sampling again, adopting spectrum in-line analysis instrument test composition is C0.25%, Mn1.44%, Si0.68%, P0.029%, S0.033%, V0.08%, be qualified finished product.
For advantage of the present invention better is described, below provide the metallicity of each sample in embodiment 1 to 3.
According to upper table, can find out, high strength iron and steel provided by the invention, prepare the iron and steel of high strength, high tenacity, yield strength is greater than 630MPa, tensile strength is greater than 810MPa, and unit elongation, greater than 17%, reduces the steel using amount 20%-40% at building trade same function and equal floor area of building, energy-saving and emission-reduction, improved economic benefit and the social benefit of enterprise.
Claims (4)
1. a high strength iron and steel, is characterized in that, comprises the composition of following mass percent: C0.20～0.25%, Mn1.20～1.50%, and Si0.45～0.60%, V0.05～0.12%, P<=0.045%, S<=0.045%, surplus is Fe.
2. prepare the method for high strength iron and steel claimed in claim 1, it is characterized in that, comprise the steps: successively
1) at 1530～1650 ℃ by the wastes of iron and steel melting, detect and regulate C, Mn, Si, P, each constituent content of S, each constituent content is met: C<=0.25%, Mn<=1.60%, Si<=0.80%, P<=0.045%, S<=0.045%;
2) at 1580～1630 ℃, under 20ppm vacuum tightness, alternately adopt above oxygen level and the gas content of reducing of bulk deoxidation method and diffusive deoxidation method deoxidation 30min, again detect and adjust each constituent content, make each constituent content scope exist: C0.20～0.25%, Mn1.20～1.50%, Si0.45～0.60%, V0.05～0.12%, P<=0.045%, S<=0.045%.
3. according to right, want the 2 described methods that prepare the high strength iron and steel, it is characterized in that, each constituent content of described detection adopts spectrum in-line analysis instrument.
4. according to right, want the 2 described methods that prepare the high strength iron and steel, it is characterized in that, described diffusive deoxidation method is from the ladle bottom Stirring by Ar Blowing.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480388A (en) * | 2014-12-13 | 2015-04-01 | 广西科技大学 | Novel formula of semi-grouting type high-strength thick reinforcing bar |
| CN104745968A (en) * | 2014-12-24 | 2015-07-01 | 福建三宝特钢有限公司 | HRB500E seismic steel bar and preparation method thereof |
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| US5421920A (en) * | 1992-09-24 | 1995-06-06 | Nippon Steel Corporation | Process for producing rolled shape steel material having high strength, high toughness, and excellent fire resistance |
| CN101693978A (en) * | 2009-10-14 | 2010-04-14 | 马鞍山钢铁股份有限公司 | Steel used for large-size hot-rolled ribbed rebar of 500MPa and smelting method thereof |
| CN102383033A (en) * | 2011-11-08 | 2012-03-21 | 河北钢铁股份有限公司承德分公司 | 600-MPa grade vanadium-containing high-strength hot-rolled steel bar and production method thereof |
| CN102864376A (en) * | 2012-09-13 | 2013-01-09 | 莱芜钢铁集团有限公司 | High-strength full-thread equal-strong resin bolting reinforcing bar and production method thereof |
| CN102899558A (en) * | 2012-11-16 | 2013-01-30 | 内蒙古包钢钢联股份有限公司 | 500Mpa-grade building aseismic reinforcement |
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2013
- 2013-08-19 CN CN201310361025XA patent/CN103397281A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5421920A (en) * | 1992-09-24 | 1995-06-06 | Nippon Steel Corporation | Process for producing rolled shape steel material having high strength, high toughness, and excellent fire resistance |
| CN101693978A (en) * | 2009-10-14 | 2010-04-14 | 马鞍山钢铁股份有限公司 | Steel used for large-size hot-rolled ribbed rebar of 500MPa and smelting method thereof |
| CN102383033A (en) * | 2011-11-08 | 2012-03-21 | 河北钢铁股份有限公司承德分公司 | 600-MPa grade vanadium-containing high-strength hot-rolled steel bar and production method thereof |
| CN102864376A (en) * | 2012-09-13 | 2013-01-09 | 莱芜钢铁集团有限公司 | High-strength full-thread equal-strong resin bolting reinforcing bar and production method thereof |
| CN102899558A (en) * | 2012-11-16 | 2013-01-30 | 内蒙古包钢钢联股份有限公司 | 500Mpa-grade building aseismic reinforcement |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104480388A (en) * | 2014-12-13 | 2015-04-01 | 广西科技大学 | Novel formula of semi-grouting type high-strength thick reinforcing bar |
| CN104745968A (en) * | 2014-12-24 | 2015-07-01 | 福建三宝特钢有限公司 | HRB500E seismic steel bar and preparation method thereof |
| CN104745968B (en) * | 2014-12-24 | 2017-02-01 | 福建三宝特钢有限公司 | HRB500E seismic steel bar and preparation method thereof |
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Application publication date: 20131120 |