Postech Academy-Industry Foundation

Posco

Nack-Joon Kim

Sang-Heon Kim

Kyoo-Young Lee

Joo-Hyun Ryu

Sea-Woong Lee

Sung-hak Lee

Won-Hwi Lee

Jin-Mo Koo

Han-Soo Kim

Yoon-Uk Heo

Jae-Sang Lee

Sung-Hak Lee

Provided is an ultrahigh-strength steel sheet for a vehicle and, more specifically, to an ultrahigh-strength and high-ductility steel sheet having excellent yield ratio and a manufacturing method therefor. Provided is an ultrahigh-strength and high-ductility steel sheet for cold press forming and a manufacturing method therefor, the steel sheet ensuring ultrahigh strength and high ductility since an alloy component of steel and manufacturing conditions are controlled and, simultaneously, having excellent impact characteristics due to a high yield strength ratio (yield ratio). Provided is the steel sheet capable of satisfying formability and impact stability, which are required for a vehicle steel sheet for cold forming, and replacing a conventional steel sheet for hot press forming, thereby reducing manufacturing costs.

Ultra high-strength and high-ductility steel sheet having excellent yield ratio and manufacturing method therefor

A high specific strength steel sheet and a method for manufacturing same are disclosed. The high specific strength steel sheet, which is an aspect of the present invention, is characterized in that an Fe&#x2014;Al-based intermetallic compound having an average particle diameter of 20 &#x3bc;m or less is homogeneously dispersed in an austenite matrix, the volume fraction of the Fe&#x2014;Al-based intermetallic compound is 1 to 50%, and the volume fraction of &#x3ba;-carbide ((Fe,Mn)AlC) which is a perovskite carbide and has an L12 structure is 15% or less.

High specific strength steel sheet and method for manufacturing same

Growing community of inventors

Pohang-si, South Korea

Nack-Joon Kim