FE-NI-CR ALLOY, FE-NI-CR ALLOY STRIP, SHEATH HEATER, METHOD FOR PRODUCING FE-NI-CR ALLOY, AND METHOD FOR PRODUCING SHEATH HEATER

摘要

Provided is an Fe-Ni-Cr alloy that has excellent surface characteristics and enables formation of a blackened coating having excellent blackening characteristics and peeling resistance. The Fe-Ni-Cr alloy has a chemical composition containing, by mass%, C, Si, Mn, P, S, Cr, Ni, Mo, Co, Cu, N, Ti, Al, O, and H, the balance being Fe and inevitable impurities, and satisfying formulae (1) to (4): (1) T1 = 11 × [%N] + 0.1; (2) T2 = -39 × [%N] + 1.0; (3) A1 = 7.5 × [%N] + 0.1; (4) A2 = -42.5 × [%N] + 1.0, where [%M] represents content (mass%) of element M in the alloy, and T1, T2, A1, and A2 satisfy relationships T1 [%Ti] T2 and A1 [%Al] A2.