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Preparation method of vanadium-chromium microalloyed large-size ultra-fine-grain high-strength high-toughness corrosion-resistant anti-seismic steel bar

A technology of micro-alloying and anti-seismic steel bars, which is applied in the direction of improving process efficiency, etc., to achieve the effect of improving precipitation strengthening effect, improving hardenability and secondary hardening, and improving anti-seismic performance

Active Publication Date: 2020-04-14
WUKUN STEEL
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Problems solved by technology

At present, there is no research report on the preparation method adopted by the present invention to prepare ultra-fine-grained, high-strength, corrosion-resistant and shock-resistant steel bars of vanadium-chromium microalloying with large specifications of 600MPa and 500MPa.
[0005] In addition, the current domestic production of HRB400E straight anti-seismic steel bars after the implementation of the GB / T 1499.2-2018 standard mainly adopts the vanadium nitrogen microalloying process, and the V content in the steel is controlled at 0.025-0.035wt%. Obtain HRB400E steel bars whose macroscopic metallography, cross-sectional Vickers hardness, and microstructure meet the GB / T 1499.2-2018 standard, and the grain size of the steel bar microstructure is mostly controlled at 9.5-10.5 grades; at present, there is no preparation method adopted by the present invention in China Research Report on Niobium-Vanadium Microalloyed 400MPa Ultra-Fine Grain High-Toughness Anti-seismic Reinforcement Bar

Method used

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  • Preparation method of vanadium-chromium microalloyed large-size ultra-fine-grain high-strength high-toughness corrosion-resistant anti-seismic steel bar
  • Preparation method of vanadium-chromium microalloyed large-size ultra-fine-grain high-strength high-toughness corrosion-resistant anti-seismic steel bar
  • Preparation method of vanadium-chromium microalloyed large-size ultra-fine-grain high-strength high-toughness corrosion-resistant anti-seismic steel bar

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preparation example Construction

[0053] One, the present invention provides a kind of vanadium-chromium microalloying large-scale 600MPa ultra-fine-grained high-strength corrosion-resistant anti-seismic steel bar preparation method, specifically comprises the following steps:

[0054] A. Molten steel smelting: scrap steel, pig iron and molten iron at 80-110kg / t respectively 钢 、30kg / t 钢、 930-960kg / t 钢 The ratio is added to the LD converter, and then the conventional top-bottom composite blowing is carried out, and conventional lime, light-burned dolomite, and magnesite balls are added to make slag, and the amount of lime added is 20-24kg / t 钢 , the addition of lightly burned dolomite is 15-20kg / t 钢 , the addition of magnesite balls is 1.0kg / t 钢 , the carbon content at the control end point is ≥0.07wt%, the tapping temperature is ≤1640°C; the ladle before tapping is 8.0kg / t 钢 The amount of vanadium-containing pig iron in the following mass ratio is added: component C 3.5wt%, Si 0.35wt%, Mn 0.60wt%, V 1.05wt%...

Embodiment 1

[0072] A preparation method of vanadium-chromium microalloyed 32mm 600MPa ultra-fine-grained high-strength corrosion-resistant and anti-seismic steel bar, comprising the following steps:

[0073] A. Molten steel smelting: 80kg / t respectively 钢 、30kg / t 钢 The cold material is loaded into the proportion, and the steel scrap (chemical composition: C 0.20wt%, Si 0.40wt%, Mn 1.25wt%, P 0.028wt%, S 0.020wt% is added to the LD converter with the following mass ratio, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.2wt%, Si 0.25wt%, Mn 0.50wt%, P 0.075wt%, S 0.020wt%, the rest is Fe and unavoidable impurities); Then press 960kg / t 钢 The proportion of molten iron is loaded into the LD converter with the following temperature and mass ratio of molten iron: molten iron temperature 1280 ° C, molten iron composition C 4.2wt%, Si 0.20wt%, Mn0.45wt%, P 0.080wt%, S 0.020wt% , the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron...

Embodiment 2

[0087] A method for preparing a large-scale 600MPa ultra-fine-grained high-strength corrosion-resistant and earthquake-resistant steel bar with a nominal diameter of 36mm, comprising the following steps:

[0088] A. Molten steel smelting: 95kg / t respectively 钢 、30kg / t 钢 The cold material is loaded into the proportion, and the scrap steel (chemical composition: C 0.22wt%, Si 0.52wt%, Mn 1.38wt%, P 0.036wt%, S 0.032wt% is added to the LD converter with the following mass ratio, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.3wt%, Si 0.35wt%, Mn 0.62wt%, P 0.085wt%, S 0.032wt%, the rest is Fe and unavoidable impurities); Then press 950kg / t 钢 The proportion of molten iron is loaded into the LD converter with the following temperature and mass ratio of molten iron: molten iron temperature 1290 ° C, molten iron composition C 4.6wt%, Si 0.32wt%, Mn0.55wt%, P 0.095wt%, S 0.032wt% , the rest is Fe and unavoidable impurities; scrap steel, pig iro...

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Abstract

The invention discloses a preparation method of vanadium-chromium microalloyed large-size ultra-fine-grain high-strength high-toughness corrosion-resistant anti-seismic steel bars. According to the method, a certain amount of vanadium-containing pig iron is added into a steel-making tapping steel ladle to replace expensive vanadium alloy, the V content of molten steel is increased, and the addingamount of the vanadium alloy is reduced; silicon-nitrogen alloy is added in the steel-making deoxidation alloying process, the molten steel is subjected to refining nitrogen blowing treatment throughan LF furnace, the nitrogen content in the molten steel is increased, the V / N ratio value in the steel is reduced, the V(C,N) precipitation driving force is increased, transfer of V from a solid solution state to a carbonitride precipitated phase in the rolling process is promoted, and a large number of fine dispersed V(C,N) precipitated phases are formed and precipitated, so that the precipitation strengthening effect of the steel is obviously improved. The method has the characteristics of being low in production cost, high in process applicability and controllability and the like, the production cost of HRB600 steel bars after the GB / T 1499.2-2018 standard is implemented is greatly reduced, the anti-seismic property and the corrosion resistance are improved, the market competitiveness of products is improved, and remarkable economic and social benefits are achieved.

Description

technical field [0001] The invention relates to a method for preparing a vanadium-chromium microalloyed large-scale ultra-fine-grained high-strength, high-strength, corrosion-resistant and shock-resistant steel bar, in particular to a vanadium-chromium micro-alloyed large-scale 600MPa ultra-fine-grained, high-strength, high-strength, corrosion-resistant and shock-resistant steel bar and a vanadium-chromium micro-alloyed steel bar The invention relates to a method for preparing large-scale 500MPa ultra-fine-grained anti-corrosion and anti-seismic steel bar with chromium microalloying, and also relates to a method for preparing a niobium-vanadium micro-alloyed 400 MPa class ultra-fine-grained high-strength and tough anti-seismic steel bar. Background technique [0002] With the continuous development of my country's buildings in the direction of high-rise, long-span and earthquake-resistant structures, the development of 500MPa and 600MPa earthquake-resistant steel bars with hi...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/26C22C38/38C22C33/06C21C7/06C21D8/08
CPCC21C7/06C21D8/08C21D2211/002C21D2211/005C21D2211/009C22C33/06C22C38/02C22C38/04C22C38/12Y02P10/20
Inventor 陈伟赵宇张卫强王卫东邓家木刘林刚张瑜张红斌王文锋赵亮刘红兵李金柱吴光耀曹重苏灿东高连坤陈必胜武天寿曹云杨冠龙陈爱林
Owner WUKUN STEEL
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