Title:
HIGH STRENGTH THIN STEEL MATERIAL FOR API HAVING EXCELLENT RESISTANCE TO DEFORMATION AND METHOD OF MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2022/131597
Kind Code:
A1
Abstract:
An embodiment of the present invention provides a high strength thin steel material for API having excellent resistance to deformation and a method of manufacturing same, the steel material comprising, in weight%, C: 0.05-0.15%, Si: 0.5% or less (0% excluded), Mn: 0.5-2.5%, Nb: 0.05% or less (0% excluded), V: 0.004% or less (0% excluded), Mo: 0.03-0.2%, Cr: 0.1-0.3%, P: 0.03% or less (0% excluded), S: 0.015% (0% excluded), Al: 0.05% or less (0% excluded), N: 0.01% or less (0% excluded), and the balance being Fe and other inevitable impurities, wherein the microstructure of the steel material comprises, in area%, ferrite: 10~30% and the balance being bainite, the ferrite having an average crystal grain size of 15-30 ㎛ and including at least 3,000/㎛2 V-based precipitates.
Inventors:
KIM JIN-YOU (KR)
Application Number:
PCT/KR2021/017158
Publication Date:
June 23, 2022
Filing Date:
November 22, 2021
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/38; C21D8/02; C21D9/46; C22C38/22; C22C38/24; C22C38/26; C22C38/58
Foreign References:
| KR20190076768A | 2019-07-02 | |||
| KR20100033413A | 2010-03-29 | |||
| JP2003293089A | 2003-10-15 | |||
| JPH0517820A | 1993-01-26 | |||
| KR20160025185A | 2016-03-08 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
Download PDF: