| 摘要 |
A high-temperature piping product is configured from a plurality of primary pipe members and a welding material. The primary pipe members are each made from an Ni-based forged alloy containing: Ni, Al, and at least one of Mo and W, the total content of the Mo and the W being 3-8 mass%, the Ni-based forged alloy exhibiting a ³'-phase dissolution temperature of from 920 to 970°C, and the ³' phase being precipitated in 30 volume% or more in a temperature range of from 700 to 800°C. The welding material is made from an Ni-based cast alloy having a cast structure formed by welding, the Ni-based cast alloy containing: Ni, Al, and at least one of Mo and W, the total content of the Mo and the W being 9-15 mass%, the Ni-based cast alloy exhibiting a ³'-phase dissolution temperature of from 850 to 900°C, the ³' phase being precipitated in 20 volume% or more in a temperature range of from 700 to 800°C. The welding material is buttered to the primary pipe members in portions to be welded to each other. |
