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US 8,999,078 B2Granted
Forging heat resistant steel, manufacturing method thereof, forged parts and manufacturing method thereof
AssigneesKabushiki Kaisha Toshiba, The Japan Steel Works, Ltd.
InventorsMasayuki Yamada, Reki Takaku, Haruki Ohnishi, Kenichi Okuno, Kenichi Imai, Kazuhiro Miki, Tsukasa Azuma, Satoru Ohsaki
Life of this patent
Estimating the term…
Abstract
A forging heat resistant steel of an embodiment contains in percent by mass C: 0.05-0.2, Si: 0.01-0.1, Mn: 0.01-0.15, Ni: 0.05-1, Cr: 8 or more and less than 10, Mo: 0.05-1, V: 0.05-0.3, Co: 1-5, W: 1-2.2, N: 0.01 or more and less than 0.015, Nb: 0.01-0.15, B: 0.003-0.03, and a remainder comprising Fe and unavoidable impurities.
Claims12
A forging heat resistant steel, containing in percent by mass C:
- 0.05-0.2, Si:
- 0.01-0.1, Mn:
- 0.01-0.15, Ni:
- 0.05-1, Cr:
- 8 or more and less than 9, Mo:
- more than 0.5 and 1 or less, V:
- 0.05-0.3, Co:
- 1-5, W:
- 1-2.2, N:
- 0.01 or more and less than 0.015, Nb:
- 0.01-0.15, B:
- 0.003-0.03, and a remainder comprising Fe and unavoidable impurities L,
- wherein a quantity of Nb(C,N) carbonitride having a diameter of 50 nm or less after aging treatment at a temperature of 625° C. for 10000 hours is 50% or more of that before the aging treatment.
10 more elements
Dependencies are inferred from the claim text.