Ni 33~35 mass%, Cr 26~28 wt%, Mo 6~7 mass%, Cu 0.5~1.5 mass%, Mn 1.0~4 wt%, 0.1 wt% Si up, Al rare-earth element 0.01 to 0.3 mass%, 0.01 mass% C maximum, N 0.1~0.25 mass%, B 0.001~0.004 mass%, 0 to 1 mass%, Fe alloy having (including unavoidable impurities) remaining.
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