ADVANCED-HIGH STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2019/009677

A1

The present invention relates to an advanced-high strength hot-rolled steel sheet, having tensile strength of 980MPa, and a method for manufacturing same, the method enabling enhanced surface quality, processability and weldability as well as significantly reduced deviation of the material in the width and length directions of the steel sheet by means of an endless rolling mode in a continuous casting-direct rolling process. According to a preferable aspect of the present invention, provided are an advanced-high strength hot-rolled steel sheet, having a microstructure, and a method for manufacturing same, the advanced-high strength hot-rolled steel sheet manufactured by means of a continuous casting-direct rolling process and comprising, in weight %, 0.030-0.085% of C, 1.8-3.0% of Mn, 0.03-1.0% of Si, 0.005-0.05% of P, 0.01% or less of S, 0.2-2.0% of Cr, 0.01-0.07% of Al, 0.005-0.10% of Ti, 0.0005-0.0050% of B, 0.001-0.010% of N, the remainder being Fe, and other inevitable impurities and, in an area fraction, 40-60% of ferrite, 30-50% of martensite and 10-20% of bainite.

KONG JONG-PAN (KR)
CHUNG JEA-SOOK (KR)

PCT/KR2018/007721

January 10, 2019

July 06, 2018

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POSCO (KR)

C22C38/38; B21B45/08; C21D8/02; C21D9/46; C22C38/02; C22C38/06; C22C38/28; C22C38/32

WO2017115748A1

2017-07-06

KR20130140205A	2013-12-23
US20170137911A1	2017-05-18
KR20140081599A	2014-07-01
JP2000063955A	2000-02-29

C&S PATENT AND LAW OFFICE (KR)

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