Title:
PROCESS FOR PRODUCING LOW-ALLOY STEEL EXCELLING IN CORROSION RESISTANCE
Document Type and Number:
WIPO Patent Application WO/2005/090615
Kind Code:
A1
Abstract:
A low-alloy steel is produced through a process of in the smelting of low-alloy steel of composition comprising 0.1 to 0.55% C, 0.05 to 0.5% Si, 0.1 to 1% Mn, 0.0001 to 0.005% S, 0.005 to 0.08% Al, 0.005 to 0.05% Ti, 0.1 to 1.5% Cr, 0.1 to 1% Mo, 0.0004 to 0.005% O, 0.0005 to 0.0045% Ca, 0 to 0.1% Nb, 0 to 0.5% V, 0 to 0.005% B, 0 to 0.10% Zr, P≤0.03%, N≤0.006% and the balance of Fe and impurities, regulating [Ti], [N] and [Ca] respectively representing the contents by mass% of Ti, N and Ca in molten steel so as to satisfy the relationship 0.0066 ≥ ([Ti]/47.9)([N]/14)/([Ca]/40.1) ≥ 0.0008. The thus obtained low-alloy steel exhibits a yield stress of ≥ 758MPa, having high SSC resistance.
Inventors:
NUMATA MITSUHIRO (JP)
OMURA TOMOHIKO (JP)
HIGUCHI YOSHIHIKO (JP)
OMURA TOMOHIKO (JP)
HIGUCHI YOSHIHIKO (JP)
Application Number:
PCT/JP2005/005152
Publication Date:
September 29, 2005
Filing Date:
March 22, 2005
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
NUMATA MITSUHIRO (JP)
OMURA TOMOHIKO (JP)
HIGUCHI YOSHIHIKO (JP)
NUMATA MITSUHIRO (JP)
OMURA TOMOHIKO (JP)
HIGUCHI YOSHIHIKO (JP)
International Classes:
C21C7/04; C22C38/00; C22C38/32; (IPC1-7): C21C7/04; C22C38/00; C22C38/32
Domestic Patent References:
| WO2003083152A1 | 2003-10-09 |
Foreign References:
| JP2001131698A | 2001-05-15 | |||
| JP2001172739A | 2001-06-26 | |||
| JP2002060893A | 2002-02-28 | |||
| JP2004515653A | 2004-05-27 |
Other References:
None
Attorney, Agent or Firm:
Honoue, Terutada (17-23 Higashinaniwa-cho 5-chom, Amagasaki-shi Hyogo 92, JP)
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