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AssigneesHitachi Metals, Ltd., Ebara Corporation
InventorsToshiaki Nonomura, Takehiro Ohno, Toshihiro Uehara, Hiroshi Yakuwa, Matsuho Miyasaka, Shuhei Nakahama, Shigeru Sawada
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A manufacturing method, particularly a heat treatment method of a Ni-based alloy having sulfidation-corrosion resistance used for component members of corrosion-resistant high-temperature equipment, that is, Waspaloy (a trademark of United Technologies) or its improved Ni-based alloy wherein the high temperature sulfidation-corrosion resistance of the alloy can be improved while maintaining hot strength properties is disclosed. A Ni-based alloy used for the method consists essentially of 0.005 to 0.1% C, 18 to 21% Cr, 12 to 15% Co, 3.5 to 5.0% Mo, not more than 3.25% Ti and 1.2 to 4.0% Al (expressed in mass percentage), with the balance substantially comprising Ni. In the manufacturing method of a Ni-based alloy having improved sulfidation-corrosion resistance, the alloy is, after solution heat treatment, subjected to stabilizing treatment at a temperature not lower than 860° C. and not higher than 920° C. for 1 to 16 hours, and aging treatment at a temperature not lower than 680° C. and not higher than 760° C. for 4 to 48 hours.
A manufacturing method of a Ni-based alloy having improved hot sulfidation-corrosion resistance containing 0.005 to 0.1% C, 18 to 21% Cr, 12 to 15% Co, 3.5 to 5.0% Mo, not more than 3.25% Ti, and 1.2 to 4.0% Al (in mass percentage), with the balance substantially comprising Ni, wherein the alloy is, after solution heat treatment, subjected to stabilizing treatment at a temperature not lower than 860° C. and not higher than 920° C. for 1 to 16 hours, and aging treatment at a temperature not lower than 680° C. and not higher than 760° C. for 4 to 48 hours.
Dependencies are inferred from the claim text.