Weld metal excellent in toughness and SR cracking resistance

Details Weld metal excellent in toughness and SR cracking resistance Weld metal excellent in toughness and SR cracking resistance

2007-02-27

2009-10-06

Mayes, Melvin C (Department: 1793)

Alloys or metallic compositions

Ferrous

Chromium containing, but less than 9 percent

C420S083000, C420S084000, C420S104000, C420S105000, C420S108000, C420S109000, C420S110000, C420S112000, C420S119000, C420S121000, C420S126000, C420S128000

Reexamination Certificate

active

07597841

ABSTRACT:
Provided is a weld metal for Cr—Mo steels which is suppressed in the formation of ferrite bands and therefore has heightened toughness and tensile strength and at the same time, good SR cracking resistance.The weld metal according to the present invention contains C: 0.02 to 0.06% (mass %, which will equally apply hereinafter), Si: 0.1 to 1.0%, Mn: 0.3 to 1.5%, Cr: 2.0 to 3.25%, Mo: 0.8 to 1.2%, Ti: 0.010 to 0.05%, B: 0.0005% or less (inclusive of 0%), N: 0.002 to 0.0120%, O: 0.03 to 0.07%, and the balance being Fe and inevitable impurities, wherein a ratio of the Ti content [Ti] to the N content [N] satisfies the following range: 2.00<[Ti]/[N]<6.25.

REFERENCES:
patent: 5407635 (1995-04-01), Iseda et al.
patent: 6940042 (2005-09-01), Hara et al.
patent: 3251424 (2001-11-01), None
patent: 3283763 (2002-03-01), None
patent: 2004-58086 (2004-02-01), None
patent: 2004-91860 (2004-03-01), None
U.S. Appl. No. 12/024,439, filed Feb. 1, 2008, Okazaki, et al.

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