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A kind of low niobium microalloyed hrb400e ultrafine grain high strength and toughness anti-seismic steel bar and its preparation method

一种微合金化、抗震钢筋的技术，应用在冶金领域，达到强度提高、降低生产成本、提高产品市场竞争的效果

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

At present, there is no research report on the preparation method of the low-niobium (Nb≤0.019wt%) microalloyed HRB400E ultra-fine grain high-strength and toughness anti-seismic steel bars adopted by the present invention

Method used

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  • A kind of low niobium microalloyed hrb400e ultrafine grain high strength and toughness anti-seismic steel bar and its preparation method
  • A kind of low niobium microalloyed hrb400e ultrafine grain high strength and toughness anti-seismic steel bar and its preparation method
  • A kind of low niobium microalloyed hrb400e ultrafine grain high strength and toughness anti-seismic steel bar and its preparation method

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preparation example Construction

[0020]The preparation method of the low-niobium microalloyed HRB400E ultrafine-grained high-strength and toughness anti-seismic steel bar of the present invention specifically includes the following steps:

[0021] A. Molten steel smelting: scrap steel, pig iron and molten iron at 120-135kg / t respectively 钢 、20kg / t 钢 , 915-940kg / t ratio into the LD converter, followed by conventional top-bottom compound blowing, adding conventional lime, light-burned dolomite, magnesite ball slagging, the amount of lime added is 20-25kg / t steel, light The addition of dolomite is 15-20kg / t of steel, and the addition of magnesite balls is 0.5kg / t 钢 , control the carbon content at the end point ≥ 0.08wt%, and the tapping temperature ≤ 1650 °C; press 1.0kg / t to the bottom of the ladle before tapping 钢 Add the following mass ratio of slag eluting desulfurizer for slag washing: Al 2 o 3 21.5wt%, SiO 2 5.2wt%, CaO 46.5wt%, Al9.2wt%, MgO6.5wt%, the rest is Fe and unavoidable impurities, the tappi...

Embodiment 1

[0037] A method for preparing low-niobium microalloyed HRB400E ultra-fine-grained high-strength and tough anti-seismic steel bars, specifically comprising the following steps:

[0038] A. Molten steel smelting: 120kg / t respectively 钢 、20kg / t 钢 The cold material load proportioning, adds the steel scrap (chemical composition: C 0.12wt%, Si 0.35wt%, Mn 0.45wt%, P0.035wt%, S 0.028wt% in LD converter, all the other are Fe and Inevitable impurities) and pig iron (chemical composition: C3.3wt%, Si 0.30wt%, Mn 0.32wt%, P0.058wt%, S 0.018wt%, the rest is Fe and unavoidable impurities); Then press 940kg / t 钢 The molten iron is loaded into the ratio, and the molten iron at the following temperature and mass ratio is added to the LD converter: the temperature of the molten iron is 1280°C, and the components of the molten iron are C 4.0wt%, Si0.15wt%, Mn0.30wt%, P 0.080wt%, S0.020wt%. , the rest is Fe and unavoidable impurities; scrap steel, pig iron and molten iron are blended into the ...

Embodiment 2

[0050] A method for preparing low-niobium microalloyed HRB400E ultra-fine-grained high-strength and tough anti-seismic steel bars, specifically comprising the following steps:

[0051] A. Molten steel smelting: 130kg / t respectively 钢 、20kg / t 钢 The cold material load proportioning, adds the steel scrap (chemical composition: C 0.17wt%, Si 0.48wt%, Mn 0.58wt%, P0.040wt%, S 0.034wt% in LD converter, all the other are Fe and Inevitable impurities) and pig iron (chemical composition: C3.4wt%, Si 0.40wt%, Mn 0.39wt%, P0.065wt%, S 0.023wt%, the rest is Fe and unavoidable impurities); Then press 928kg / 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 1295 ° C, molten iron composition C 4.3wt%, Si0.25wt%, Mn0.40wt%, 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 t...

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Abstract

The invention discloses a low-niobium micro-alloyed HRB400E ultra-fine-grained high-strength and tough seismic steel bar and a preparation method thereof. The chemical composition of the steel bar is: C 0.20-0.24 wt%, Si 0.38-0.48 wt%, Mn 1.30~1.50wt%, Nb 0.014~0.019wt%, S≤0.040wt%, P≤0.045wt%, O≤0.0070wt%, N≤0.0075wt%, the rest is Fe and unavoidable impurities; its preparation The steel rolling method adopts a lower heating temperature and rolling start temperature, which refines the original austenite grains and promotes the refinement of ferrite grains when austenite transforms into ferrite, and the grain size reaches 11.0 Above, the fine-grain strengthening effect is remarkable, and the plasticity and toughness of the steel are improved at the same time; adding ferroniobium to the steel, controlling the lower starting rolling temperature and adopting the multi-stage low water pressure staged cooling process after rolling, Nb(C,N) precipitates out The driving force of the ferrite increases, and a large number of fine and dispersed second phases are precipitated on the matrix, grain boundaries and dislocation lines of the low-temperature ferrite region, which strengthens the ferrite matrix, significantly improves the strength of the steel, and improves the welding of the steel , aging and other properties.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a low-niobium micro-alloyed HRB400E ultra-fine-grained high-strength and tough 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 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 towards high-rise, long-span and earthquake-resistant structures, the development of fine-grained anti-seismic steel bars with high strength, toughness and excellent comprehensive performance has become one of the importa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C33/06C21C5/35C21C7/06B22D11/22C21D8/08
CPCC21D8/065C21D8/08C21D2211/001C21D2211/002C21D2211/005C22C33/04C22C38/001C22C38/02C22C38/04C22C38/26Y02P10/20
Inventor 陈伟张卫强陈必胜武天寿吴光耀曹云杨春雷张瑜王忠宇刘林刚陈爱林李金柱杨凯苏灿东舒云胜
Owner WUKUN STEEL
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