ROLLED STEEL SHEET AND MANUFACTURING METHOD THEREFOR

WIPO Patent Application WO/2016/047839

A1

The present invention relates to a rolled steel sheet and a manufacturing method therefor. The rolled steel sheet according to the present invention comprises 0.01-0.0.35 wt% of carbon (C), 0.01-0.05 wt% of silicon (Si), 0.1-0.35 wt% of manganese (Mn), 0.001-0.015 wt% of phosphorus (P), 0.001-0.015 wt% of sulfur (S), 0.01-0.04 wt% of solution-aluminum (Sol.-Al), 1-30 ppm of nitrogen (N), and the balance of iron (Fe) and other inevitable impurities, wherein grains having a ferrite grain size (FGS) of 7-8 are uniformly formed by finish rolling, at 850-950°C, a steel slab made of middle and low carbon steel to which 1-60 ppm of boron (B) is added so as to meet the condition of 0.2≤[B/N]≤1.1, winding the same at 610-670°C, continuously annealing the same at 740-820°C, and then temper rolling the same under the condition in which an elongation ratio of 0.7-1.6% is met for a material thickness of 0.4≤T<2.4.

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KIM YOUNG HA (KR)
KANG YONG SIK (KR)

PCT/KR2014/009401

March 31, 2016

October 07, 2014

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POSCO (KR)

C22C38/02; B21B3/00; C21D8/02

KR20130023274A	2013-03-07
KR20130077071A	2013-07-09
KR20130081707A	2013-07-17
JP2007284763A	2007-11-01
JP2007277652A	2007-10-25

KANG, SUNG-BAE (KR)
강성배 (KR)

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