Title:
SEAMLESS STEEL TUBE
Document Type and Number:
WIPO Patent Application WO/2023/190011
Kind Code:
A1
Abstract:
A seamless steel tube having the chemical composition set forth in the specification, the chemical composition satisfying [5C+Mo+Cr≥1.00], while also satisfying [GN-1.96×(Mn+70P+100N)≥7.50] and [GN-1.37×(Mn+85P-30Ca)≥8.90] in relation to prior austenite grain size GN, the tube having a tensile strength of 1,200 MPa or more and a critical hydrogen concentration of 2.5 ppm or more.
Inventors:
AOKI KOSUKE (JP)
NAKAMURA HIROFUMI (JP)
OMURA TOMOHIKO (JP)
NAKAMURA HIROFUMI (JP)
OMURA TOMOHIKO (JP)
Application Number:
PCT/JP2023/011450
Publication Date:
October 05, 2023
Filing Date:
March 23, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/54; C21D9/08
Domestic Patent References:
| WO2011151908A1 | 2011-12-08 | |||
| WO2008050628A1 | 2008-05-02 |
Foreign References:
| JP2010132999A | 2010-06-17 | |||
| JP2002294339A | 2002-10-09 |
Attorney, Agent or Firm:
BRIGHTAS IP ATTORNEYS (JP)
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