Niobium addition in Cr-Mo-¼V steel castings for steam...

Details Niobium addition in Cr-Mo-¼V steel castings for steam... Niobium addition in Cr-Mo-¼V steel castings for steam...

2011-07-19

2011-07-19

Yee, Deborah (Department: 1733)

Alloys or metallic compositions

Ferrous

Chromium containing, but less than 9 percent

C420S111000, C148S334000

Reexamination Certificate

active

07981360

ABSTRACT:
A chromium-molybdenum-vanadium (Cr—Mo—V) cast steel including 0.04 to 0.08% by weight of niobium is disclosed. The cast steel may include 0.08 to 0.12% by weight carbon. The cast steel may also have a sulphur content of 0.015% by weight or less, and a phosphorus content of 0.02% by weight or less. The silicon content may be 0.30 to 0.60% by weight, the manganese content may be 0.50 to 0.80% by weight, the chromium content may be 1.20 to 1.50% by weight, the molybdenum content may be 0.90 to 1.10% by weight, and the vanadium content may be 0.20 to 0.30% by weight.

REFERENCES:
patent: 5084238 (1992-01-01), Masuyama et al.
patent: 5855845 (1999-01-01), Beguinot et al.
patent: 363199850 (1988-08-01), None
patent: 403087332 (1991-04-01), None
patent: 9263888 (1997-10-01), None
patent: 410259449 (1998-09-01), None
patent: 2003306740 (2003-10-01), None
patent: 2005029882 (2005-02-01), None
Machine-English translation of Japanese patent 410259449, Fujita et al., Sep. 29, 1998.

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