Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Reexamination Certificate
2006-09-19
2009-12-22
Yee, Deborah (Department: 1793)
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
C075S539000, C075S526000, C420S084000, C420S085000, C420S106000, C420S110000, C420S111000
Reexamination Certificate
active
07635406
ABSTRACT:
A low alloy steel, which has a chemical composition by mass %, of C: 0.1 to 0.55%, Si: 0.05 to 0.5%, Mn: 0.1 to 1%, S: 0.0001 to 0.005%, Al: 0.005 to 0.08%, Ti: 0.005 to 0.05%, Cr: 0.1 to 1.5%, Mo: 0.1 to 1%, O: 0.0004 to 0.005%, Ca: 0.0005 to 0.0045%, Nb: 0 to 0.1%, V: 0 to 0.5%, B: 0 to 0.005%, Zr: 0 to 0.10%, P≦0.03%, and N≦0.006%, with the balance being Fe and impurities, is manufactured by adjusting the value of ([Ti]/47.9)([N]/14)/([Ca])/40.1) satisfies not less than 0.0008 and not more than 0.0066, at the time of melting the said low alloy steel, wherein [Ti], [N] and [Ca] are the contents in the molten steel by mass % of Ti, N and Ca respectively. The thus-manufactured low steel alloy has a high SSC resistance with a yield stress of not less than 758 MPa.
REFERENCES:
patent: 2001-131698 (2001-05-01), None
patent: 2001-172739 (2001-06-01), None
patent: 2002-060893 (2002-02-01), None
patent: 2004-515653 (2004-05-01), None
patent: WO 03/083152 (2003-10-01), None
Higuchi Yoshihiko
Numata Mitsuhiro
Omura Tomohiko
Clark & Brody
Sumitomo Metal Industries Ltd.
Yee Deborah
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