Ultralow carbon bake hardening steel and production method thereof

A technology of bake hardening and production method, which is applied in the field of steel preparation, can solve the problems of affecting surface quality, unstable BH value control, etc., and achieve the effect of stable bake hardening value

Inactive Publication Date: 2020-09-08
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the unstable control of BH value in the existing technology, the surface quality is affected

Method used

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  • Ultralow carbon bake hardening steel and production method thereof
  • Ultralow carbon bake hardening steel and production method thereof
  • Ultralow carbon bake hardening steel and production method thereof

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Embodiment Construction

[0026] The present invention will be described in detail below in conjunction with specific embodiments and examples, and the advantages and various effects of the present invention will be presented more clearly. Those skilled in the art should understand that these specific implementations and examples are used to illustrate the present invention, not to limit the present invention.

[0027] Throughout the specification, unless otherwise specified, terms used herein should be understood as commonly used in the art. Therefore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, this specification shall take precedence.

[0028] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0029] The ...

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Abstract

The invention discloses an ultralow carbon bake hardening steel and a production method thereof, in percentage by mass, the ultralow carbon bake hardening steel comprises the following chemical components: 0.0018-0.0029wt%, 0-0.030wt% of Si, 0.6-0.7wt% of Mn, 0.04-0.05wt% of P, 0.005-0.015wt% of S, 0.035-0.065wt% of AlT, 0.006-0.010wt% of Nb, 0.0020-0.0060wt% of Ti, 0.0005-0.0012wt% of B and lessthan or equal to 0.0030wt% of N. In the production line, cold rolling reduction rate controlled to be 79%-82%, and dew point is controlled to be less than or equal to 40 DEG C. According to the ultralow carbon bake hardening steel and the production method thereof provided by the invention, the ultralow carbon bake hardening steel of which BH is stabilized at 35-70 is obtained through cooperationof components and technologies.

Description

technical field [0001] The invention relates to the technical field of steel preparation, in particular to an ultra-low-carbon bake-hardening steel and a production method thereof. Background technique [0002] Ultra-low-carbon bake-hardening steel is a kind of high-quality steel plate for automobiles with relatively high strength (yield strength ≥ 220MPa). After being stamped and formed at room temperature, the yield strength can be improved to a certain extent after baking paint temperature aging treatment. The characteristic of BH steel plate is that it is soft before stamping and easy to form and process, and the yield strength is increased through the painting and baking process after stamping, so it is very suitable for covering parts such as automobile outer panels. Bake hardening (BH) steel is characterized by low yield point and excellent formability during stamping. After stamping, the yield point rises due to high temperature and short-term heat treatment during c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C21D8/02C21D1/26C21D1/74
CPCC21D1/26C21D1/74C21D8/0226C21D8/0236C21D8/0247C21D2211/005C22C38/002C22C38/004C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 王明哲尉冬青靓商光鹏吴耐张誉公史昌
Owner BEIJING SHOUGANG CO LTD
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