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Ageing-resistant cold-rolled bake-hardening steel 220 BH and production method thereof

A bake-hardening and aging-resistant technology, which is applied in the field of aging-resistant cold-rolled bake-hardening steel, can solve problems such as poor aging resistance, meet good application requirements, improve aging resistance, and expand the application ratio

Inactive Publication Date: 2017-05-24
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above technical problems, the present invention provides an aging-resistant cold-rolled bake-hardening steel 220BH and its production method, which solves the problem of poor aging resistance of cold-rolled bake-hardening steel with a yield strength of 220MPa produced in the prior art. Easy to use in the automotive industry

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  • Ageing-resistant cold-rolled bake-hardening steel 220 BH and production method thereof
  • Ageing-resistant cold-rolled bake-hardening steel 220 BH and production method thereof

Examples

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Embodiment 1

[0017] In this embodiment, the aging-resistant cold-rolled bake-hardening steel 220BH includes the following components in terms of mass percentage:

[0018] C: 0.001%~0.003%, Si: 0.02%, Mn: 0.50%, P: 0.060%, S: 0.008%, Als: 0.025%, Nb: 0.005%~0.030%, N: 0.0022%, Mo: 0.01~ 0.08%, the balance is iron and unavoidable impurities.

[0019] In this embodiment, the production method of aging-resistant cold-rolled bake-hardening steel 220BH is as follows:

[0020] 1) It is smelted according to the method of ultra-low carbon steel and poured into billets;

[0021] 2) Place the billet in a walking heating furnace and heat it at a heating temperature of 1200°C; after the billet comes out of the furnace, it is descaled with high-pressure water and then rolled in a rough rolling mill; Rolling by rolling mill, final rolling temperature 900°C; coiling after laminar cooling, coiling temperature 720°C; total reduction ratio of cold continuous rolling 75%; continuous annealing, heating / holdi...

Embodiment 2

[0023] In this embodiment, the aging-resistant cold-rolled bake-hardening steel 220BH includes the following components in terms of mass percentage:

[0024] C: 0.001% to 0.003%, Si: 0.02%, Mn: 0.55%, P: 0.045%, S: 0.010%, Als: 0.030%, Nb: 0.005% to 0.030%, N: 0.0024, Mo: 0.01 to 0.08 %, the balance is iron and unavoidable impurities.

[0025] In this embodiment, the production method of aging-resistant cold-rolled bake-hardening steel 220BH is as follows:

[0026] 1) It is smelted according to the method of ultra-low carbon steel and poured into billets;

[0027] 2) Place the cast slab in a walking heating furnace and heat it at a heating temperature of 1210°C; after the cast slab is released from the furnace, it is descaled by high-pressure water and then rolled in a rough rolling mill; Rolling by rolling mill, final rolling temperature 900°C; coiling after laminar cooling, coiling temperature 720°C; total reduction ratio of cold continuous rolling 70%; continuous annealin...

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Abstract

The invention belongs to the technical field of ageing-resistant cold-rolled bake-hardening steel and particularly relates to ageing-resistant cold-rolled bake-hardening steel 220 BH and a production method thereof. The ageing-resistant cold-rolled bake-hardening steel 220 BH comprises the following components: 0.001-0.003% of C, less than or equal to 0.05% of Si, 0.35-0.80% of Mn, 0.035-0.080% of P, less than or equal to 0.015% of S, 0.015-0.060% of Als, 0.005-0.030% of Nb, less than or equal to 0.0050% of N, 0.01-0.08% of Mo, and the balance of Fe and inevitable impurities. The problem of poor aging resistance of cold-rolled bake-hardening steel with the yield strength of 220 MPa in the prior art is solved, and application to the automobile industry is facilitated.

Description

technical field [0001] The invention belongs to the technical field of aging-resistant cold-rolled bake-hardening steel, and in particular relates to an aging-resistant cold-rolled bake-hardening steel 220BH and a production method thereof. Background technique [0002] In the 21st century, my country's automobile industry has developed rapidly, and has become the world's largest automobile production and sales country. With the development of the automobile industry, automobile materials are also gradually changing. Bake-hardening (BH) steel has become the main material of modern automobile panels due to its excellent formability and good dent resistance. The use of BH steel plate does not affect the shape stability of the formed part, and improves the dent resistance. It is beneficial to realize the thinning of automobile plates, and BH steel has become an important part of modern automobile steel. [0003] Due to the special requirements of automobile materials, BH steel...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C21D1/26C21D8/02
CPCC22C38/004C21D1/26C21D8/0226C21D8/0273C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 高洪刚刘明辉孙忠斌张猛孟兵
Owner BENGANG STEEL PLATES
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