Title:
HOT ROLLED STEEL SHEET HAVING EXCELLENT COLD BENDABILITY AFTER HEATING AND QUENCHING-TEMPERING HEAT TREATMENT, STEEL PIPE, MEMBER AND MANUFACTURING METHODS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/121183
Kind Code:
A1
Abstract:
A hot rolled steel sheet having excellent cold bendability after heating and quenching-tempering heat treatment, a steel pipe, a member and manufacturing methods therefor are provided. The present invention relates to: a hot rolled steel sheet comprising, by wt%, 0.20% or greater and less than 0.3% of C, 0.5-1.3% of Mn, 0.3% or less of Si (excluding 0%), 0.03% or less of P (including 0%), 0.004% or less of S (including 0%), 0.04% or less of Al (excluding 0%), 0.3% or less of Cr, 0.1-0.4% of Ni, 0.05% of Ti (including 0%), 0.0005-0.0050% of B, 0.01% or less of N (excluding 0%) and the balance of Fe and other impurities, and satisfying relations 1-3; a steel pipe; and a member.
Inventors:
SEONG HWAN-GOO (KR)
BAE SEONG-BEOM (KR)
BAE SEONG-BEOM (KR)
Application Number:
PCT/KR2022/020724
Publication Date:
June 29, 2023
Filing Date:
December 19, 2022
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C22C38/50; C21D1/18; C21D8/02; C22C38/00; C22C38/42; C22C38/44; C22C38/46; C22C38/48; C22C38/54
Foreign References:
| JP2015117406A | 2015-06-25 | |||
| KR20190078327A | 2019-07-04 | |||
| KR20190077800A | 2019-07-04 | |||
| KR20120087619A | 2012-08-07 | |||
| JP2011102434A | 2011-05-26 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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