To provide an Fe-Ni alloy in which hot workability is improved and thermal expansion coefficient is small as to have ≤1×10-6/°C thermal expansion coefficient at the service temperature of a shadow mask.
The alloy has a composition containing 34-37% Ni, ≤0.01% C, ≤0.0040% N, ≤0.05% Si, ≤0.1% Mn, ≤0.003% Al, ≤0.005% S, 0.0005-0.0040% B, and 10(C+N) to 0.2% Ti and shows ≤1.0×10-6/°C thermal expansion coefficient at 30 to 100°C. This alloy can be manufactured by an ingoting process or a continuous casting process. In the case of an ingoting process, an ingot after component regulation is heated to 1,280 to 1,350°C in ≥3 hr total heating time and worked into a slab by a single or plural-time slabbing or forging, and the slab is heated to 1,100 to 1,350°C for 1 to 6 hr and then hot rolled. In the case of a continuous casting process, the resultant cast slab is heated to 1,280 to 1,350°C for 1 to 6 hr and then hot rolled.
MORIKAWA HIROSHI
YAMAUCHI TAKASHI
