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A preparation method of nitrogen-enriched vanadium microalloyed hrb600 ultrafine grain anti-seismic steel bar

A technology of ultra-fine grained and seismic steel bars, applied in the metallurgical field, can solve the problems of high price of vanadium-nitrogen alloys, high production costs, unfavorable production costs of HRB600 high-strength steel bars, and the improvement of market competitiveness of products.

Active Publication Date: 2021-05-18
WUKUN STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high price of vanadium-nitrogen alloy, the production cost is high. In addition, the anti-seismic performance of steel bars produced by this process is not well matched, which is not conducive to the reduction of production costs of HRB600 high-strength steel bars and the improvement of product market competitiveness.

Method used

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  • A preparation method of nitrogen-enriched vanadium microalloyed hrb600 ultrafine grain anti-seismic steel bar
  • A preparation method of nitrogen-enriched vanadium microalloyed hrb600 ultrafine grain anti-seismic steel bar
  • A preparation method of nitrogen-enriched vanadium microalloyed hrb600 ultrafine grain anti-seismic steel bar

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preparation example Construction

[0020] The preparation method of nitrogen-rich vanadium microalloyed HRB600 ultra-fine grain anti-seismic steel bar of the present invention specifically comprises the following steps:

[0021] A. Molten steel smelting: scrap steel, pig iron and molten iron at 130-160kg / t respectively 钢 、20kg / t 钢 、900-930kg / 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 ball slagging are added. The amount of lime added is 25-30kg / t steel, and the amount of light-burned dolomite added is 12 -18kg / t steel, the amount of magnesite balls added is 1.0kg / t steel, the carbon content at the control end point is ≥0.06wt%, the tapping temperature is ≤1630°C; the ladle before tapping is 6.0kg / t 钢 Add the following mass ratio of vanadium-containing pig iron: composition C 3.5wt%, Si 0.40wt%, Mn 0.65wt%, V 1.00-1.20wt%, P0.205wt%, S 0.075wt%, the rest is Fe and not Impurities t...

Embodiment 1

[0040] A. Molten steel smelting: 130kg / t respectively 钢 、20kg / t 钢 The cold material load proportioning, adds the steel scrap (chemical composition: C 0.12wt%, Si 0.20wt%, Mn 0.45wt%, P 0.025wt%, S 0.020wt% in LD converter, all the other are Fe and Inevitable impurities) and pig iron (chemical composition: C3.0wt%, Si 0.30wt%, Mn 0.45wt%, P0.070wt%, S 0.020wt%, the rest is Fe and unavoidable impurities); Then press 930kg / t 钢The molten iron is loaded into the ratio, and the following temperature and mass ratio of molten iron are added to the LD converter: molten iron temperature 1280 ° C, molten iron composition C 4.4wt%, Si0.25wt%, Mn 0.45wt%, P 0.075wt%, S 0.020wt% , the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron are blended into the LD converter, then conventional top-bottom composite blowing is carried out, and conventional lime, lightly burned dolomite and magnesite balls are added to make slag, and the amount of lime added is 25kg / t of ...

Embodiment 2

[0054] A, molten steel smelting: according to 145kg / t steel, the cold charge of 20kg / t steel is loaded into proportion respectively, in LD converter, add the steel scrap of following mass ratio (chemical composition: C 0.18wt%, Si 0.27wt%, Mn 0.55wt% %, P 0.035wt%, S0.032wt%, the rest are Fe and unavoidable impurities) and pig iron (chemical composition: C3.2wt%, Si 0.40wt%, Mn0.57wt%, P 0.080wt%, S 0.030wt%, the rest is Fe and unavoidable impurity); after that, according to the proportion of 915kg / t steel molten iron, add the following temperature and mass ratio of molten iron in the LD converter: the temperature of molten iron is 1300°C, and the composition of molten iron is C4. 5wt%, Si 0.37wt%, Mn 0.58wt%, P 0.092wt%, S 0.030wt%, the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron are mixed into the LD converter, and the conventional top-bottom compounding is carried out Blowing, adding conventional lime, light-burned dolomite, magnesite balls ...

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Abstract

The invention discloses a method for preparing nitrogen-rich vanadium-rich microalloyed HRB600 ultrafine-grain anti-seismic steel bars. The preparation method includes molten steel smelting, deoxidation alloying, molten steel refining in an argon station, molten steel casting, billet heating, and billet controlled rolling and controlled cooling. In the process, the present invention adds a certain amount of vanadium-containing pig iron to replace expensive vanadium alloys in the steelmaking converter tapping and LF furnace refining process, which increases the V content of molten steel, and adds high-nitrogen vanadium alloys and appropriate silicon-nitrogen alloys in the process of steelmaking deoxidation and alloying , the molten steel is refined and blown with nitrogen by an LF furnace, which increases the nitrogen content in the molten steel, significantly reduces the V / N ratio in the steel, and significantly improves the precipitation strengthening effect of the steel; the preparation method of the present invention reduces the production cost and improves the shock resistance , Improve product market competitiveness.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing nitrogen-rich vanadium microalloyed HRB600 ultrafine-grain anti-seismic steel bars. Background technique [0002] Hot-rolled ribbed steel bar is the main reinforcement material of reinforced concrete building structure, and it carries the stress and strain of loads such as tensile and compressive stress and strain in the structure. At present, the annual output of hot-rolled ribbed steel bars in my country is about 200 million tons, which is the most widely used steel material in the construction of national economic construction projects. 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 high strength, toughness and excellent comprehensive performance is one of the important tasks for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C38/04C22C38/02C22C33/04C21C5/35C21C7/06C21C7/00C21C7/072B22D11/16B22D11/22C21D8/08
CPCC22C38/12C22C38/04C22C38/02C22C38/002C22C38/001C21C7/06C21C7/0006C21D8/065C22C33/06C21D9/525C21D6/005C21D6/008C21D2211/005C21D2211/009Y02P10/20
Inventor 陈伟苏鹤洲张卫强黄兴凯张瑜张红斌刘林刚王永志王文锋赵亮李德贵赵宇李金柱陈必胜武天寿邓家木苏灿东杨春雷文玉兵刘红兵
Owner WUKUN STEEL
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