Steel plate for automobile and production method thereof

A production method and steel plate technology, which is applied in the field of metal material processing, can solve problems such as poor aging resistance, high annealing temperature, and high cooling rate, and achieve the effects of stable BH2, improved product quality, and stable bake hardening value

Inactive Publication Date: 2012-01-04
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the high annealing temperature, high cooling rate and low bake hardening value BH in the existing bake hardening steel plate production process. 2 Large fluctuations and poor anti-aging performance, providing a steel plate for automobiles and its production method

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  • Steel plate for automobile and production method thereof
  • Steel plate for automobile and production method thereof
  • Steel plate for automobile and production method thereof

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Embodiment Construction

[0034] The present invention provides an embodiment of a steel plate for automobiles and a production method thereof. By optimizing the composition of steel plates for automobiles, adjusting and optimizing the parameters of hot rolling, cold rolling and annealing processes, and the parameters of smoothing processes, a low-temperature annealed ultra-low carbon steel sheet is successfully produced. Bake hardened steel sheet for automobiles. The mass percentage of the chemical composition of the steel for automobile sheet is: 0.0015%≤C≤0.004%, 0.35%≤Mn≤0.65%, Si≤0.03%, 0.03%≤P≤0.05%, S≤0.015%, Als: 0.02- 0.07%, 0.005%≤Nb≤0.015%, 0.0002%≤B≤0.0015%, N≤0.004%, the balance is Fe and other trace elements.

[0035] The embodiment of the present invention also provides a method for producing the steel plate for automobiles comprising:

[0036] Step S1, the molten steel is refined and then continuously cast to obtain a slab. During the refining process, the solid solution carbon conten...

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Abstract

The invention discloses a steel plate for the automobiles. The steel plate comprises the following chemical compositions in percent by mass: 0.0015%<=C<=0.004%, 0.35%<=Mn<=0.65%, Si<=0.03%, 0.03%<=P<=0.05%, S<=0.015%, 0.02-0.07% of Als, 0.005%<=Nb<=0.015%, 0.0002%<=B<=0.0015%, N<=0.004% and the balance of Fe and trace elements. The invention also discloses a method for producing the steel plate for the automobiles. The steel plate produced by the method provided by the invention is characterized by stable bake hardenability BH2 and good aging resistance, and achieves the aims of energy saving and emission reduction. Through the invention, the product quality is improved, and considerable economic benefits are brought.

Description

technical field [0001] The invention belongs to the field of metal material processing, and in particular relates to a steel plate for automobiles and a production method thereof. Background technique [0002] Ultra-low-carbon bake-hardened steel plate (CR180BH), which is produced by continuous annealing process in large quantities, is mostly used in the automotive industry, mainly for automotive outer panels, such as: engine hood outer panels, fender panels, door outer panels, and trunks cover etc. According to the requirements of CB / T20564.1-2007 for similar steel types, its composition is: C≤0.04%, Mn≤0.80%, Si≤0.10%, P≤0.08%, S≤0.025%, Als≥0.01%, and the rest The amount is Fe. The national standard requires 180MPa≤ReL≤240MPa for its yield strength, Rm≥300MPa for tensile strength, and A for elongation after fracture. 80 ≥32%, n90≥0.18, r90≥1.6, bake hardening value BH 2 ≥30MPa. In the European standard EN10268-2006, the composition requirements are C≤0.05%, Mn≤0.70%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/02
Inventor 滕华湘李本海刘李斌王海全王洋尉冬熊爱明乔建军刘光明朱国森
Owner SHOUGANG CORPORATION
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