ULTRA HIGH STRENGTH AND HIGH DUCTILITY STEEL SHEET HAVING EXCELLENT YIELD RATIO AND MANUFACTURING METHOD FOR SAME

Title:

ULTRA HIGH STRENGTH AND HIGH DUCTILITY STEEL SHEET HAVING EXCELLENT YIELD RATIO AND MANUFACTURING METHOD FOR SAME

Document Type and Number:

WIPO Patent Application WO/2020/050573

Kind Code:

A1

Abstract:

An ultra high strength and high ductility steel sheet having an excellent yield ratio according to an aspect of the present invention contains, in weight %, 0.1-0.3% of carbon (C), 2% or less of silicon (Si), 6-10% of manganese (Mn), 0.05% or less of phosphorus (P), 0.02% or less of sulfur (S), 0.02% or less of nitrogen (N), 0.5% or less (excluding 0%) of aluminum (Al), and the balance Fe and inevitable impurities, and further contains at least one selected from the group consisting of 0.1% or less of titanium (Ti), 0.1% or less of niobium (Nb), 0.2% or less of vanadium (V), and 0.5% or less of molybdenum (Mo), wherein the ultrahigh-strength and high-ductility steel sheet comprises 20 area% or more of residual austenite as a microstructure, the average aspect ratio of the residual austenite being 2.0 or higher.

Inventors:

RYU JOO-HYUN (KR)
LEE KYOO-YOUNG (KR)
LEE SEA-WOONG (KR)

Application Number:

PCT/KR2019/011281

Publication Date:

March 12, 2020

Filing Date:

September 03, 2019

Export Citation:

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Assignee:

POSCO (KR)

International Classes:

C22C38/04; C21D8/02; C22C38/00; C22C38/02; C22C38/06

Foreign References:

KR101798771B1	2017-11-17
JP6372632B1	2018-08-15
JP5888471B1	2016-03-22
JP2013185196A	2013-09-19
JP2011157583A	2011-08-18
KR101586933B1	2016-01-19
KR20130138039A	2013-12-18

Other References: