Nippon Yakin Kogyo Co., Ltd.

Kun Wang

Shigeru Hirata

Kazuhiro Yamakawa

Hidekazu Todoroki

Provided is an Fe&#x2014;Ni&#x2014;Cr alloy that has excellent surface characteristics and enables formation of a blackened coating having excellent blackening characteristics and peeling resistance. The Fe&#x2014;Ni&#x2014;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&#xd7;[% N]+0.1; (2) T2=&#x2212;39&#xd7;[% N]&#x2212;1.0; (3) A1=7.5&#xd7;[% N]+0.1; (4) A2=&#x2212;42.5&#xd7;[% N]+1.0, where [% M] represents content (mass %) of element M in the alloy, and T1, T2, A1, and A2 satisfy relationships T1&#x3c;[% Ti]&#x3c;T2 and A1&#x3c;[% A1]&#x3c;A2.

Fe-Ni-Cr alloy, Fe-Ni-Cr alloy strip, sheath heater, method of manufacturing Fe-Ni-Cr alloy, and method of manufacturing sheath heater

An austenitic Fe&#x2014;Ni&#x2014;Cr alloy comprises C: 0.005&#x2dc;0.03 mass %, Si: 0.17&#x2dc;1.0 mass %, Mn: not more than 2.0 mass %, P: not more than 0.030 mass %, S: not more than 0.0015 mass %, Cr: 18&#x2dc;28 mass %, Ni: 21.5&#x2dc;32 mass %, Mo: 0.10&#x2dc;2.8 mass %, Co: 0.05&#x2dc;2.0 mass %, Cu: less than 0.25 mass %, N: not more than 0.018 mass %, Al: 0.10&#x2dc;1.0 mass %, Ti: 0.10&#x2dc;1.0 mass %, Zr: 0.01&#x2dc;0.5 mass %, and the balance being Fe and inevitable impurities; wherein Cr, Mo, N and Cu satisfy PRE=Cr+3.3&#xd7;Mo+16&#xd7;N&#x2267;20.0 and PREH=411-13.2&#xd7;Cr-5.8&#xd7;Mo+0.1&#xd7;Mo+1.2&#xd7;Cu&#x2266;145.0 and wherein Al, Ti, and Zr satisfy 0.5&#x2266;Al+Ti+1.5&#xd7;Zr&#x2266;1.5, and has an excellent corrosion resistance in air or under a wet environment even at a surface state having an oxide film formed by an intermediate heat treatment.

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Tokyo, Japan

Kun Wang