A nitrogen-rich vanadium-chromium microalloyed ultra-fine grain corrosion-resistant HRB400E wire rod anti-seismic steel bar and its preparation method

A technology of nitrogen-rich vanadium-chromium microalloy and earthquake-resistant steel bar, applied in the metallurgical field, can solve problems such as unfavorable production cost of steel bar enterprises, reduce product market competitiveness, expensive vanadium alloy, etc. Nucleation, the effect of increasing pearlite content

Active Publication Date: 2022-05-10
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because a certain amount of vanadium-nitrogen alloy and vanadium-iron nitride are added to the steel, the vanadium alloy is expensive, resulting in high production costs, which is not conducive to the reduction of production costs of steel bar enterprises and the improvement of product market competitiveness

Method used

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  • A nitrogen-rich vanadium-chromium microalloyed ultra-fine grain corrosion-resistant HRB400E wire rod anti-seismic steel bar and its preparation method
  • A nitrogen-rich vanadium-chromium microalloyed ultra-fine grain corrosion-resistant HRB400E wire rod anti-seismic steel bar and its preparation method
  • A nitrogen-rich vanadium-chromium microalloyed ultra-fine grain corrosion-resistant HRB400E wire rod anti-seismic steel bar and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A. Molten steel smelting: 195kg / t respectively 钢 、50kg / t 钢 The cold material is loaded into the proportion, and the scrap steel (chemical composition: C 0.20wt%, Si 0.35wt%, Mn 1.05wt%, P 0.036wt%, S 0.035wt% is added to the LD converter with the following mass ratio, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.0wt%, Si 0.15wt%, Mn 0.30wt%, P0.090wt%, S 0.035wt%, the rest is Fe and unavoidable impurities); Then press 815kg / 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 1340 ° C, molten iron composition C4.2wt%, Si 0.30wt%, Mn 0.25wt%, P 0.100wt%, 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-bottom composite blowing is carried out, and conventional lime, lightly burned dolomite and magnesite balls are added to make slag, ...

Embodiment 2

[0050] A. Molten steel smelting: 200kg / t respectively 钢 、50kg / t 钢 The cold material is loaded into the proportion, and the steel scrap (chemical composition: C 0.23wt%, Si 0.48wt%, Mn 1.30wt%, P 0.041wt%, S 0.040wt% is added to the LD converter with the following mass ratio, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.1wt%, Si 0.22wt%, Mn 0.41wt%, P0.102wt%, S 0.042wt%, the rest is Fe and unavoidable impurities); Then press 815kg / 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 1345 ° C, molten iron composition C4.4wt%, Si 0.38wt%, Mn 0.32wt%, P 0.110wt%, S 0.038wt% , 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, ...

Embodiment 3

[0062] A. Molten steel smelting: 205kg / t respectively 钢 、50kg / t 钢 The cold material is charged into the proportion, and the scrap steel (chemical composition: C 0.26wt%, Si 0.60wt%, Mn 1.50wt%, P 0.045wt%, S 0.047wt% is added in the LD converter, and the rest is Fe and Inevitable impurities) and pig iron (chemical composition: C3.2wt%, Si 0.30wt%, Mn 0.53wt%, P0.115wt%, S 0.050wt%, the rest is Fe and unavoidable impurities); Then press 815kg / 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 1355°C, molten iron composition C4.5wt%, Si 0.45wt%, Mn 0.40wt%, P 0.120wt%, S 0.045wt% , 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...

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Abstract

The invention discloses a nitrogen-rich vanadium-chromium micro-alloyed ultra-fine-grain corrosion-resistant HRB400E wire rod anti-seismic steel bar and a preparation method thereof. The chemical composition of the steel bar is: C 0.21-0.25 wt%, Si 0.28-0.36 wt%, Cr 0.300~0.340wt%, Mn 0.85~0.95wt%, V 0.010~0.015wt%, S≤0.045wt%, P≤0.045wt%, N 0.0080~0.0100wt%, the rest is Fe and unavoidable impurities . The steel bar is prepared through the following process steps: molten steel smelting, deoxidation alloying, molten steel refining in an argon station, molten steel casting, billet heating and billet controlled rolling and controlled cooling processes. Through the integration and innovation of chemical composition design, converter smelting, deoxidation alloying process, continuous casting, steel rolling heating system, controlled rolling and controlled cooling process, the method of the present invention fully exerts various strengthening effects such as precipitation strengthening, fine grain strengthening, and structure strengthening. It has the characteristics of low production cost, process applicability and strong controllability. The steel bars produced have the advantages of excellent and stable process mechanical properties, fine and uniform microstructure, good corrosion resistance, good plasticity and toughness, and excellent seismic performance.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a nitrogen-rich vanadium-chromium micro-alloyed ultra-fine grain corrosion-resistant HRB400E wire rod anti-seismic steel bar and a preparation method thereof. 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 exceeds 200 million tons, and it is the steel material most used in the construction of national economic construction projects. In recent years, with the continuous upgrading of building structures, the strength of steel used has continued to increase, which has promoted the upgrading of building steel bars and the revision and improvement of product standards. The national standard GB / T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/24C22C38/60C22C33/06C21C7/06C21D8/08
CPCC22C38/02C22C38/04C22C38/24C22C38/60C22C33/06C21C7/06C21D8/08Y02P10/20
Inventor 陈伟张卫强张瑜张红斌刘林刚王卫东李艳萍邹应春韩益民曹云杨冠龙
Owner WUKUN STEEL
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