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Steel plate used for producing low-temperature hot-stamped automobile part as well as manufacturing method of steel plate and use of steel plate

A technology of auto parts and manufacturing methods, which is applied in the direction of manufacturing tools, temperature control, rolling force/roll gap control, etc., and can solve problems such as difficult control of springback, cracking of body parts, affecting the dimensional accuracy of parts and body assembly, etc.

Inactive Publication Date: 2017-07-07
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the strength of the steel plate increases and the thickness decreases, the body parts are prone to cracking during the stamping forming process, and the springback is difficult to control, which affects the dimensional accuracy of the parts and the assembly of the body.

Method used

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  • Steel plate used for producing low-temperature hot-stamped automobile part as well as manufacturing method of steel plate and use of steel plate
  • Steel plate used for producing low-temperature hot-stamped automobile part as well as manufacturing method of steel plate and use of steel plate
  • Steel plate used for producing low-temperature hot-stamped automobile part as well as manufacturing method of steel plate and use of steel plate

Examples

Experimental program
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Effect test

Embodiment A-F

[0062] Embodiment A-F and comparative example G

[0063] The steel plate in above-mentioned embodiment and comparative example adopts following steps to make:

[0064] (1) Smelting: adopt converter smelting, control the mass percent of each chemical element as shown in Table 1;

[0065] (2) Casting: casting slabs are obtained through continuous casting;

[0066] (3) Hot rolling: the billet is heated to 1200-1250°C and then controlled rolling, the starting rolling temperature is 950-1150°C, the final rolling temperature is 800-900°C, and the thickness of the hot-rolled plate is usually controlled between 3-4mm , the coiling temperature is 500-800°C, and then cooled to room temperature, so that the microstructure is all martensitic;

[0067] (3a) Annealing: Annealing in a bell furnace, the annealing temperature is 580-860°C, and the annealing time is 6-96hr. The microstructure obtained after annealing contains a certain volume fraction of austenite, so as to improve the plasti...

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Abstract

The invention discloses a steel plate used for producing a low-temperature hot-stamped automobile part. The steel plate consists of the following chemical elements in percentage by mass: 0.1%-0.3% of C, 0.1%-1.5% of Si, 7%-12% of Mn, 0.01%-3.0% of Al, 0.005%-0.010% of N, less than or equal to 0.02% of P, less than or equal to 0.02% of S, and the balance Fe and other inevitable impurities; besides, the content of the chemical elements further meets the following formula: 24.2C-2.8Si+Mn-10.1Al greater than or equal to (-)15, wherein C, Si, Mn and Al in the formula separately represent mass percentage of the corresponding elements. The invention further discloses a manufacturing method for the steel plate and a use of the steel plate. Besides, the invention further discloses the low-temperature hot-stamped automobile part manufactured by the steel plate.

Description

technical field [0001] The invention relates to a steel plate and its manufacturing method and application, in particular to a steel plate used for hot stamping and its manufacturing method and application. Background technique [0002] In order to achieve the purpose of lightening the body, improving safety performance, saving energy and reducing emissions, advanced high-strength steels are widely used in the field of automobile manufacturing, such as DP steel, CP steel, TRIP steel, etc. However, as the strength of the steel plate increases and the thickness decreases, the body parts are prone to cracking during the stamping forming process, and the springback is difficult to control, which affects the dimensional accuracy of the parts and the assembly of the body. Therefore, the hot stamping process and steel for hot stamping (PHS), which have high strength after forming and complex shapes of formed parts, are widely used in body structural parts, such as front side member...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C21D8/02B21D37/16B21B37/74B21B37/58
CPCB21B37/58B21B37/74B21D37/16C21D8/0226C21D8/0236C21D8/0247C21D2211/001C21D2211/005C21D2211/008C22C38/001C22C38/02C22C38/04C22C38/06
Inventor 韩启航张玉龙王利张理扬范吾平
Owner BAOSHAN IRON & STEEL CO LTD
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