Formed reinforced complex phase steel and preparation method thereof

A technology of complex phase steel and chemical composition, applied in the field of cold-rolled ultra-high-strength steel production and manufacturing, can solve the problems of poor forming ability of complex phase steel, and achieve the effect of good hole expansion performance and formability.

Active Publication Date: 2021-01-22
SHOUGANG CORPORATION
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Problems solved by technology

[0007] In order to solve the technical problem of poor formability of the existing complex-phase steel, the present invention provides a form-enhanced complex-phase steel. The tensile strength of the complex-phase steel is greater than 980 MPa, and it has good hole expansion performance and formability, and is especially suitable for Auto parts that require a certain forming ability in addition to the flanging and reaming design

Method used

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  • Formed reinforced complex phase steel and preparation method thereof
  • Formed reinforced complex phase steel and preparation method thereof
  • Formed reinforced complex phase steel and preparation method thereof

Examples

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Embodiment

[0064]The chemical composition of the formed reinforced composite phase steel according to the mass fraction of the present invention is as follows:

[0065]C: 0.17%~0.21%, Si: 0.2~0.7%, Mn: 1.8~2.5%, P: ≤0.01%, S: ≤0.005%, Al: 0.4~0.8%, Cr: 0.1~0.39%, Nb: 0.02~0.04%;

[0066]And contains at least one of the following elements:

[0067]Ti: 0.01 to 0.04%, Cu: 0.03 to 0.1%; the balance is Fe.

[0068]The present invention has 25 examples and 4 comparative examples. In the 25 examples, the forming reinforced multiphase steel has a total of 7 different chemical compositions, named as compositions 1-7, compositions 1-7, and the chemical compositions of the comparative examples. Table 1 shows.

[0069]Table 1 Chemical composition of ingredients 1-7 and comparative examples 1-4 (mass fraction%)

[0070] CSi Mn PSAlNb CrMo Ti Cu Ingredient 1 0.170.662.060.0050.0030.530.0310.38-0.0380.009 Ingredient 2 0.180.332.110.0070.0030.750.0220.25-0.040.012 Ingredient 3 0.190.572.320.0070.0020.570.0280.31-0.0320.012...

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Abstract

The invention provides formed reinforced complex phase steel, and belongs to the field of cold-rolled ultrahigh-strength steel production and manufacturing. The formed reinforced complex phase steel is prepared from the chemical components including, by mass, 0.17%-0.21% of C, 0.2%-0.7% of Si, 1.8%-2.5% of Mn, less than or equal to 0.01% of P, less than or equal to 0.005% of S, 0.4%-0.8% of Al, 0.1%-0.39% of Cr, 0.02%-0.04% of Nb, at least one of 0.01%-0.04% of Ti and 0.03%-0.1% of Cu, and the balance Fe. The tensile strength of the complex phase steel is higher than 980 MPa, and meanwhile, the complex phase steel has good broaching performance and forming performance and is particularly applicable to automobile parts which have flanging and broaching design and need certain forming capacity. The invention further provides a preparation method of the formed reinforced complex phase steel.

Description

Technical field[0001]The invention belongs to the field of cold-rolled ultra-high-strength steel production and manufacturing, and relates to a forming-reinforced duplex steel and a preparation method thereof.Background technique[0002]With the development of the automobile industry and the need for energy saving and emission reduction, improving the safety of the entire vehicle and reducing the weight of the vehicle body have become the main trends in the development of the automobile industry. The lighter-density aluminum alloy and carbon fiber materials are expensive and are not suitable for household economical cars. Therefore, more and more ultra-high-strength steels are used in automobile body-in-white manufacturing to improve safety and reduce vehicle weight.[0003]In recent years, the application ratio of dual-phase steel in ultra-high-strength steel is relatively high, but dual-phase steel has poor hole reaming ability and is not suitable for the preparation of parts that req...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/06C22C38/20C22C38/26C22C38/28C22C38/38C21D8/02C21D1/26
CPCC22C38/02C22C38/38C22C38/06C22C38/26C22C38/28C22C38/20C21D8/0205C21D1/26C21D2211/001C21D2211/005C21D2211/002C21D2211/008
Inventor 刘华赛韩赟邱木生王崇学姜英花阳锋谢春乾刘广会李翔宇滕华湘李飞章军朱国森
Owner SHOUGANG CORPORATION
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