Title:
HIGH STRENGTH SEAMLESS STEEL PIPE AND RISER
Document Type and Number:
WIPO Patent Application WO/2018/020972
Kind Code:
A1
Abstract:
Provided is a high strength seamless steel pipe with which high strength and low hardness can be made to stably coexist while ensuring weldability. For the high strength seamless steel pipe, the chemical composition is, in mass%, C: 0.10-0.18%, Si: 0.03-1.0%, Mn: 0.5-2.0%, P: 0.020% or less, S: 0.0080% or less, Cr: 0.10-0.60%, Mo: 0.10-0.40%, V: 0.02-0.40%, Ti: 0.004-0.020%, B: 0.0005-0.005%, Al: 0.10% or less, N: 0.008% or less, Ca: 0.0004-0.0040%, Cu: 0.1-1.0%, Ni: 0.2-1.0%, Nb: 0-0.05%, the balance being Fe and impurities and expression (1) being satisfied.
C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5×B≤0.28 Expression (1)
In the element symbols in expression (1), the contents of the corresponding elements in mass% are to be substituted.
Inventors:
OE TARO (JP)
Application Number:
PCT/JP2017/024739
Publication Date:
February 01, 2018
Filing Date:
July 05, 2017
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C22C38/58; C21D8/10; C21D9/08
Foreign References:
| JPS61238917A | 1986-10-24 | |||
| JPS575819A | 1982-01-12 | |||
| JP2003201543A | 2003-07-18 | |||
| JP2008291363A | 2008-12-04 |
Other References:
See also references of EP 3492612A4
Attorney, Agent or Firm:
UEBA, Hidetoshi et al. (JP)
Download PDF:
Previous Patent: ASPHALT MIXTURE, METHOD FOR PRODUCING SAME AND PAVING METHOD USING SAME
Next Patent: WIRING MODULE FOR CELL
Next Patent: WIRING MODULE FOR CELL