Title:
COLD-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/214634
Kind Code:
A1
Abstract:
Provided in the present invention is a cold-rolled steel sheet comprising: carbon (C): 0.15-0.20% by weight, silicon (Si): 1.0-2.0% by weight, manganese (Mn): 1.5-3.0% by weight, phosphorus (P): greater than 0 and 0.02% by weight or less, sulfur (S): greater than 0 and 0.003% by weight or less, aluminum (Al): 0.01-0.3% by weight, nitrogen (N): greater than 0 and 0.01% by weight or less, titanium (Ti): 48/14·[N] to 0.1% by weight (where [N] is the weight % value of nitrogen), and the remaining being iron (Fe) and other unavoidable impurities, wherein a final microstructure consists of ferrite, acicular retained austenite, a martensite/austenite composite structure, and massive martensite, wherein the area fraction of the ferrite is 30-60%, the area fraction of the acicular retained austenite is 5-12%, the area fraction of the martensite/austenite composite structure is 25-50%, the area fraction of the massive martensite is 5-12%, and the carbon concentration in the retained austenite is 1.1% by weight or more.
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Inventors:
KIM KYEONG MIN (KR)
NOH HYUN SEONG (KR)
MAENG HAN SOL (KR)
GOO NAM HOON (KR)
HAN SEONG KYUNG (KR)
NOH HYUN SEONG (KR)
MAENG HAN SOL (KR)
GOO NAM HOON (KR)
HAN SEONG KYUNG (KR)
Application Number:
PCT/KR2022/019627
Publication Date:
November 09, 2023
Filing Date:
December 05, 2022
Export Citation:
Assignee:
HYUNDAI STEEL CO (KR)
International Classes:
C22C38/04; C21D8/02; C21D9/46; C22C38/00; C22C38/02; C22C38/06; C22C38/14
Domestic Patent References:
| WO2022086050A1 | 2022-04-28 |
Foreign References:
| KR20150130612A | 2015-11-24 | |||
| KR102372546B1 | 2022-03-10 | |||
| KR20210032499A | 2021-03-24 | |||
| JP2013540901A | 2013-11-07 |
Attorney, Agent or Firm:
LEE, In Haeng et al. (KR)
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