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Austenitic, lightweight, high-strength steel sheet of which the yield ratio and flexibility are outstanding and a production method therefor

By adjusting the alloy element concentration and process technology, austenitic lightweight high-strength steel plates with high yield strength ratio and ductility are prepared, which solves the shortcomings of existing steel plates in terms of yield strength and specific gravity, and achieves high strength, low specific gravity and Low-cost automotive component materials.

Active Publication Date: 2013-10-23
POSCO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the disclosed steel sheet is deformed, austenite can easily transform into martensite, thereby reducing ductility

Method used

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  • Austenitic, lightweight, high-strength steel sheet of which the yield ratio and flexibility are outstanding and a production method therefor
  • Austenitic, lightweight, high-strength steel sheet of which the yield ratio and flexibility are outstanding and a production method therefor
  • Austenitic, lightweight, high-strength steel sheet of which the yield ratio and flexibility are outstanding and a production method therefor

Examples

Experimental program
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Effect test

Embodiment approach

[0067] Steel sheets were produced under the conditions shown in Table 2 by using steel ingots having the compositions shown in Table 1. During the manufacturing process, the starting temperature of hot rolling was 1150° C., the heating rate during cold rolling was 5° C. / second, and the annealing time was 45 seconds. Then, the properties and microstructures of the hot-rolled and cold-rolled steel sheets were measured as shown in Table 3.

[0068] Table 1

[0069]

[0070]

[0071]

[0072] *IS: inventive steel, **CS: comparative steel

[0073] Table 2

[0074]

[0075]

[0076] *IS: Inventive steel, **ISP: Inventive sample, ***CSP: Comparative sample, ****CS: Comparative steel

[0077] table 3

[0078]

[0079]

[0080] *IS: Inventive steel, **ISP: Inventive sample, ***CSP: Comparative sample, ****CS: Comparative steel

[0081] As shown in Tables 1 to 3, samples 1 to 9 of the present invention prepared according to the composition and manufacturing con...

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PUM

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Abstract

The present invention relates to an austenitic, lightweight, high-strength steel sheet having a high yield ratio and ductility and a method for producing the same, and more particularly, to a high-strength steel sheet for automotive interior panels, exterior panels, and structural parts, and a method for producing the steel sheet. An aspect of the present invention provides austenitic, lightweight, high-strength hot rolled steel sheet , cold rolled steel sheet and coated steel sheet having a high yield ratio and ductility and a method for producing thereof including appropriate concentrations of alloying elements such as Mn, Si, and Al to obtain a tensile strength of 800 MPa or greater, an elongation of 30% or greater, and a yield ratio of 60% or greater that are difficult to obtain from high-carbon, high-manganese steel sheets or high-manganese, lightweight steel sheets of the related art. The present invention provides a steel sheet having a low specific gravity, a high yield ratio, and high ductility as compared to high-strength steel sheets of the related art such as advanced high strength steels (AHSS). The steel sheet of the present invention is effective in maintaining the rigidity of a structural member and have good press processing characteristics so that the steel sheet can be used for manufacturing automotive parts to reduce the weight of automobiles and combining a plurality of parts into a single module or as one part to simplify machining or assembly processes.

Description

technical field [0001] The present invention relates to an austenitic light-weight high-strength steel plate with high yield ratio and ductility and a preparation method thereof, and more particularly, to a high-strength steel sheet for automobile inner panels, outer panels and structural parts A strength steel plate, and a method for producing the same. Background technique [0002] Recently, the demand for high-strength automotive components has increased significantly to allow reduction of the weight of the car for low exhaust emissions and good gas mileage as well as to improve the crash safety of the car. For this reason, high-ductility, high-strength steel sheets have been developed and commercialized. [0003] But the car's weight could increase as more components are used to improve safety and convenience, while relatively heavy batteries are used in next-generation electric vehicles that use electricity instead of petroleum. However, there is a limit to reducing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D8/02C22C38/04C22C38/58
CPCC22C38/002B32B15/01C22C38/04C22C38/44C22C38/06C22C38/48C22C38/02C22C38/58C22C38/28C22C38/20C22C38/001C22C38/54C22C38/14B32B15/012C21D8/0205C21D8/02C23C2/02C23C2/28C22C38/12C21D2211/001C23C2/04C22C38/50C22C38/00B21D17/04C21D8/0247C21D8/0284C23C30/00C22C38/38C21D8/0273Y10T428/12799Y10T428/12757C23C2/0224C21D8/0226C21D8/0263C22C38/60
Inventor 陈光根韩箱浩郭在贤
Owner POSCO CO LTD
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