Full-ferrite high-strength steel and preparation method thereof

A ferritic and high-strength steel technology, applied in the field of all-ferritic high-strength steel and its preparation, can solve the problems of low work hardening rate of steel plate materials, decreased cold deformation ability, poor secondary cold bending performance, etc., and achieve high strength , High cold deformation ability, good secondary cold bending performance

Active Publication Date: 2021-03-19
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above problems, the present invention provides an all-ferritic high-strength steel and its preparation method, which solves the problem of low work hardening rate and secondary Technical problems of poor secondary cold bending performance and significant drop in cold deformation ability

Method used

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  • Full-ferrite high-strength steel and preparation method thereof
  • Full-ferrite high-strength steel and preparation method thereof
  • Full-ferrite high-strength steel and preparation method thereof

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preparation example Construction

[0068] The present invention also provides the preparation method of the all-ferritic high-strength steel described in the present invention, and the preparation method comprises the following steps:

[0069] Smelting and continuous casting to obtain a steel slab, and hot rolling the steel slab to obtain a hot-rolled plate;

[0070] laminar cooling and coiling of the hot-rolled sheet to obtain the all-ferritic high-strength steel;

[0071]Wherein, in terms of mass percentage, the steel slab includes: C 0.03-0.10%, Si 0-0.05%, Mn 0.8-1.30%, P≤0.015%, S≤0.005%, Al 0.02-0.04%, Nb 0.03- 0.070%, Ti 0.05-0.10%, Mo 0.10-0.50%; optionally contain V 0.02-0.07% and / or Cr 0.1-0.5%; the balance is iron and unavoidable impurities;

[0072] In some preferred embodiments, by mass percentage, the steel slab comprises: C 0.06%, Si 0.02%, Mn 1.1%, P 0.012%, S 0.0015%, Al 0.04%, Nb 0.05%, Ti 0.075% , Mo0.25%; optionally contain V 0.03% and / or Cr 0.4%; the balance is iron and unavoidable impuri...

Embodiment 1

[0093] In this embodiment, 5 test groups are adopted, and in test groups 1-5, the all-ferritic high-strength steel is prepared by the method of the present invention;

[0094] One, adopt known smelting methods such as converter to smelt the molten steel that contains alloy composition of the present invention, and can obtain steel slab by known casting methods such as continuous casting method, by mass percentage, the chemical composition that steel slab comprises is as table 1 shown;

[0095] Table 1: Chemical composition contained in the steel slab of the present invention

[0096] serial number C(％) Si(%) Mn(%) P(％) S(％) Nb(%) Ti(%) Al(％) Mo(%) V(％) Cr(％) Test group 1 0.03 0.8 0.015 0.005 0.03 0.05 0.02 0.10 0.07 Test group 2 0.10 0.05 1.3 0.014 0.0035 0.07 0.10 0.04 0.50 0.1 Test group 3 0.06 0.02 1.1 0.012 0.0015 0.05 0.075 0.04 0.25 0.03 0.4 Test group 4 0.09 0.03 0.85 0.010 0.002 0.0...

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Abstract

The invention belongs to the technical field of iron and steel smelting, and particularly relates to full-ferrite high-strength steel and a preparation method thereof. The full-ferrite high-strength steel comprises the following components in percentage by mass: 0.03-0.10 % of C, 0-0.05 % of Si, 0.8-1.30 % of Mn, less than or equal to 0.015 % of P, less than or equal to 0.005 % of S, 0.02-0.04 % of Al, 0.03-0.070 % of Nb, 0.05-0.10 % of Ti and 0.10-0.50 % of Mo, optionally, 0.02%-0.07% of V and / or 0.1%-0.5% of Cr, and the balance of iron and inevitable impurities. According to the full-ferritehigh-strength steel and the preparation method thereof, the technical problems that in the prior art, after the strength of a steel plate is improved through ultrafine grains, the work hardening rateof the steel plate is low, the secondary cold bending performance is poor, and the cold deformation capacity is remarkably reduced are solved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to an all-ferritic high-strength steel and a preparation method thereof. Background technique [0002] Strengthening metal materials is the goal pursued by material researchers, and strength is an important symbol of the development of metal material science and technology. However, in most cases, as the strength of metallic materials increases, their plasticity and toughness decrease, so the strength-plasticity or toughness presents an inverse relationship. [0003] With the development of modern industrial technology, more and more components require metal materials to have both high strength and good plasticity and toughness. The low plasticity and low toughness of high-strength metals have weakened their potential for industrial application to a certain extent, and thus become one of the bottlenecks in the development of metal materials science. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/26C22C38/28C22C38/22C22C38/24C21D8/02
CPCC22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/26C22C38/28C22C38/22C22C38/24C21D8/0226C21D2211/005
Inventor 惠亚军吴科敏田志红李飞刘锟陈斌牛涛周娜李玉鹏肖宝亮郭佳徐伟王淑志王伦许克好李晓林张大伟
Owner SHOUGANG CORPORATION
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