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A kind of all-ferritic high-strength steel and its preparation method

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 poor secondary cold bending performance, low work hardening rate of steel plate materials, and decreased cold deformation ability, etc. Sub-cold bending performance, avoiding the problem of cracks, and increasing the effect of work hardening index

Active Publication Date: 2022-02-18
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of all-ferritic high-strength steel and its preparation method
  • A kind of all-ferritic high-strength steel and its preparation method
  • A kind of all-ferritic high-strength steel and its preparation method

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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 in particular relates to an all-ferritic high-strength steel and a preparation method thereof. In terms of mass percentage, the full-ferritic high-strength steel 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%; optional V 0.02-0.07% and / or Cr 0.1-0.5%; the balance is iron and unavoidable impurities. The all-ferritic high-strength steel and the preparation method thereof in the present invention solve the problem of low work hardening rate, poor secondary cold bending performance, and cold deformation of the steel plate after the strength of the steel plate is increased by ultra-fine grains in the prior art. Technical issues that significantly reduce capacity.

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 Patents(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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