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High nitrogen-vanadium microalloying large-scale anti-seismic reinforcing steel bar preparation method

A seismic steel bar, alloying technology, applied in the direction of manufacturing tools, manufacturing converters, heat treatment equipment, etc., can solve problems such as unfavorable steel production costs, high production costs, and reduction of product market competitiveness.

Active Publication Date: 2020-04-17
WUKUN STEEL
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Problems solved by technology

At present, there is no research report on the preparation method of the present invention using nitrogen-rich vanadium microalloyed HRB600 ultrafine grain seismic steel bars
[0006] In addition, after the implementation of the GB / T 1499.2-2018 standard, domestic large-scale HRB400E steel bars with a nominal diameter of 32-40mm are usually produced by the vanadium microalloying process. A certain amount of vanadium-nitrogen alloy or vanadium-iron nitride is added to the steel. Expensive, leading to higher production costs, which is not conducive to the reduction of production costs of steel bar enterprises and the improvement of product market competitiveness
[0007] At present, there are domestic research reports on the production technology of HRB400E straight anti-seismic steel bars after the implementation of the GB / T 1499.2-2018 standard. The vanadium nitrogen microalloying process is mainly used, and the V content in large-scale HRB400E steel with a nominal diameter of 32mm and above is controlled to 0.030 -0.040wt%, by controlling the rolling temperature and rolling passes, the macroscopic metallography, cross-section Vickers hardness, and microstructure meet the requirements of the GB / T 1499.2-2018 standard for large-scale HRB400E steel bars with a nominal diameter of 32mm and above. There is no research report on the preparation method of large-scale 400MPa high-strength and toughness anti-seismic steel bars produced by the nitrogen-rich vanadium microalloying process adopted in the present invention

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  • High nitrogen-vanadium microalloying large-scale anti-seismic reinforcing steel bar preparation method
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  • High nitrogen-vanadium microalloying large-scale anti-seismic reinforcing steel bar preparation method

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preparation example Construction

[0047] A method for preparing nitrogen-enriched vanadium microalloyed HRB600 ultrafine-grain anti-seismic steel bars, specifically comprising the following steps:

[0048] 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 compound 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 25-30kg / t 钢 , the addition of lightly burned dolomite is 12-18kg / t 钢 , the addition of magnesite balls is 1.0kg / t 钢 , the carbon content at the control end point is ≥0.06wt%, the tapping temperature is ≤1630°C; the steel ladle is 6.0kg / t before tapping 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%, P 0.205wt%, S0.075wt%, the rest is Fe and not Impurities to avoid, add vanadium-cont...

Embodiment 1

[0067] The preparation method of nitrogen-rich vanadium microalloyed HRB600 ultra-fine grain anti-seismic steel bar specifically includes the following steps:

[0068] A. Molten steel smelting: 130kg / t respectively 钢 、20kg / t 钢 The cold material is loaded into the proportion, and the scrap steel (chemical composition: C 0.12wt%, Si 0.20wt%, Mn 0.45wt%, P 0.025wt%, S 0.020wt% is added in the LD converter, and the rest is 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 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 4.4wt%, 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-bo...

Embodiment 2

[0082] The preparation method of nitrogen-rich vanadium microalloyed HRB600 ultra-fine grain anti-seismic steel bar specifically includes the following steps:

[0083] A. Molten steel smelting: 145kg / t respectively 钢 、20kg / t 钢 The cold material is loaded into the proportion, and the scrap steel (chemical composition: C 0.18wt%, Si 0.27wt%, Mn 0.55wt%, P 0.035wt%, S 0.032wt% is added in the LD converter, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.2wt%, Si 0.40wt%, Mn 0.57wt%, P0.080wt%, S 0.030wt%, the rest is Fe and unavoidable impurities); Then press 915kg / 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 1300 ° C, molten iron composition C 4.5wt%, Si0.37wt%, Mn 0.58wt%, P 0.092wt%, S 0.030wt% , the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron are blended into the LD converter, then conventional top-...

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Abstract

The invention discloses a high nitrogen-vanadium microalloying large-scale anti-seismic reinforcing steel bar preparation method. In the steelmaking converter steel tapping process and the ladle furnace (LF) refining process, a certain amount of vanadium pig iron is added to replace an expensive vanadium alloy, so that the molten steel V content is increased; and in the steelmaking deoxidation alloying process, a high nitrogen-vanadium alloy and appropriate amount of silicon-nitrogen alloys are added, and molten steel is subjected to LF refining and nitrogen-blowing treatment, so that the nitrogen content in the molten steel is increased, a V / N matching ratio in steel is remarkably reduced, and a steel precipitation strength effect is remarkably improved. According to the high nitrogen-vanadium microalloying large-scale anti-seismic reinforcing steel bar preparation method provided by the invention, through the integrated innovation of chemical composition design, converter smelting, deoxidation alloying, LF refining, continuous casting, a rolled steel heating schedule, rolling temperature and a controlled cooling technology, a produced reinforcing steel bar has the advantages of excellent and stable process mechanical property, fine and uniform microscopic structure, good ductility and toughness, low strain timeliness, excellent anti-seismic property and the like, the production cost is reduced, the anti-seismic property is improved, and the market competitiveness of products is improved.

Description

technical field [0001] The present invention relates to a method for preparing a nitrogen-rich vanadium microalloyed large-scale anti-seismic steel bar, in particular to a method for preparing a nitrogen-rich vanadium micro-alloyed HRB600 ultra-fine grain anti-seismic steel bar and a large-scale nitrogen-rich vanadium microalloyed steel bar Preparation method of 400MPa high strength and toughness seismic steel bar. 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 eart...

Claims

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Application Information

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Patent Type & Authority Applications(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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