Turbine casing
AssigneeHitachi, Ltd.
InventorsHirotsugu Kawanaka, Masahiko Arai, Tateki Nakamura
Life of this patent
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Abstract
A casing is formed from an alloy which contains, by mass, 0.08-0.20% C, 0.05-0.45% Si, 0.10-0.30% Mn, 0.80-1.40% Ni, 1.00-1.40% Cr, 1.20-1.60% Mo, 0.10-0.30% V, 0.06-0.10% Ti, 0.0005-0.0010% B, not more than 0.01% P, not more than 0.01% S, and not more than 0.005% Al, the balance being Fe and unavoidable impurity elements. The casing has excellent high-temperature strength, high toughness and excellent weldability, and is applicable to casings used in high-temperature high-pressure steam environments.
Claims15
A casing formed from an alloy containing, by mass, 0.08-0.20% C, 0.05-0.45% Si, 0.10-0.30% Mn, 0.80-1.40% Ni, 1.00-1.40% Cr, 1.20-1.60% Mo, 0.10-0.30% V, 0.06-0.10% Ti, 0.0005-0.0010% B, not more than 0.01% P, not more than 0.01% S, and 0.003-0.005% Al, the balance being Fe and unavoidable impurity elements;
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- wherein the content ratio of Mn/Ni is in the range of 0.07-0.32;
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- wherein the casing is used for a turbine.
A casing formed from an alloy containing, by mass, 0.08-0.20% C, 0.05-0.45% Si, 0.10-0.30% Mn, 1.10-1.40% Ni, 1.00-1.40% Cr, 1.20-1.60% Mo, 0.10-0.30% V, 0.06-0.10% Ti, 0.0005-0.0010% B, not more than 0.01% P, not more than 0.01% S, and 0.003-0.005% Al, the balance being Fe and unavoidable impurity elements;
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- wherein the content ratio of Mn/Ni is in the range of 0.07-0.27;
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- wherein the casing is used for a turbine.
A casing formed from an alloy containing, by mass, 0.05-0.25% C, 0.05-0.75% Si, 0.10-0.30% Mn, 0.80-1.40% Ni, 0.50-2.00% Cr, 0.05-2.00% Mo, 0.05-0.50% V, 0.06-0.15% Ti, 0.0003-0.0030% B, not more than 0.01% P, not more than 0.01% S, and 0.003-0.005% Al, the balance being Fe and unavoidable impurity elements, wherein the content ratio of Mn/Ni is in the range of 0.05-0.50, the content ratio of (Mo+V)/Ni is in the range of 0.71-3.16, and the content ratio of (Mo+V)/Ni/B is in the range of 200-5000.
Dependencies are inferred from the claim text.