THIN COLD-ROLLED STEEL PLATE HAVING HIGH STRENGTH AND HIGH FORMABILITY, AND PREPARATION METHOD THEREOF

WIPO Patent Application WO/2013/039272

A1

The present invention relates to a thin cold-rolled steel plate used in home appliances and the like, and a preparation method thereof, and provides a thin cold-rolled steel plate with high strength and high formability, and a preparation method thereof. The present invention relates to an thin cold-rolled steel plate with high strength and high formability, comprising 0.15-0.25 wt% of carbon (C), 1.5-2.5 wt% of manganese (Mn), 0.1-1.0 wt% of silicon (Si), 0.01-0.05 wt% of titanium (Ti), 5-30 ppm of boron (B), and a balance of Fe and other impurities, wherein the tissue comprises 70-100 vol% of bainite, and 0-30 vol% of ferrite, and a preparation method thereof. The thin steel plate provided by the present invention has high strength and high formability, and thus can be effectively used in thin cold-rolled products and the like having high strength requiring high strength of 300 HV or higher on the basis of HV 500g in addition to parts supporting the strength of a chassis such as a notebook, an LCD monitor, an LCD, PMP or LED TV, and the like.

LEE BYOUNG-HO (KR)
YOON JEONG-BONG (KR)
KIM JEONG-CHEOL (KR)
KIM SUNG-HWAN (KR)

PCT/KR2011/006866

March 21, 2013

September 16, 2011

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POSCO (KR)
LEE BYOUNG-HO (KR)
YOON JEONG-BONG (KR)
KIM JEONG-CHEOL (KR)
KIM SUNG-HWAN (KR)

C22C38/00; B21B3/02; C21D8/02; C21D9/46; C22C38/04

JP2008106351A	2008-05-08
JP2009185355A	2009-08-20
JPH0835039A	1996-02-06
KR20110026751A	2011-03-16

C&S PATENT AND LAW OFFICE (Daelim Acrotel13 Eonju-ro 30-gil, Gangnam-gu, Seoul 135-971, KR)

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