Nippon Yakin Kogyo Co., Ltd.

Kazuhiro Yamakawa

Shigeru Hirata

Yuji Ikegami

Kun Wang

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.

Austenitic Fe&#x2014;Ni&#x2014;Cr alloy

High-Mn austenitic stainless steels having a chemical composition comprising C: 0.02-0.12 mass %, Si: 0.05-1.5 mass %, Mn: 10.0-22.0 mass %, S: not more than 0.0028 mass %, Ni: 4.0-12.0 mass %, Cr: 14.0-25.0 mass % and N: 0.07-0.17 mass % with the balance being Fe and inevitable impurities, provided that these components are contained so that &#x3b4; cal represented by the following equation is not more than 5.5%: &#x3b4; cal (mass %)=(Cr+0.48Si)&#x2212;(Ni+0.11Mn&#x2212;0.0101Mn+26.4C+20.1N)&#x2212;4.7, wherein each element symbol in the equation is a content of the respective element (mass %), and having a magnetic permeability of not more than 1.003 under a magnetic field of 200 kA/m.

High-Mn austenitic stainless steel and a producing method of high-Mn austenitic stainless steel sheet

As a stainless steel for a metal part for clothing ornament capable of working into a complicated form part and having such nonmagnetic properties that the worked part can cope with the detection through needle detecting device is provided a high-Mn austenitic stainless steel having a chemical composition comprising C: 0.02-0.12 mass %, Si: 0.05-1.5 mass %, Mn: 10.0-22.0 mass %, S: not more than 0.03 mass %, Ni: 4.0-12.0 mass %, Cr: 14.0-25.0 mass % and N: 0.07-0.17 mass %, provided that these components are contained so that &#x3b4; cal (mass %) represented by the following equation (1) is not more than 5.5 mass %:&#x3b4; cal (mass %)=(Cr+0.48Si+1.21Mo+2.2(V+Ti)+0.15Nb)&#x2212;(Ni+0.47Cu+0.11Mn&#x2212;0.0101Mn+26.4C+20.1N)&#x2212;4.7&#x2003;&#x2003;(1)and having a magnetic permeability of not more than 1.003 under a magnetic field of 200 kA/m.

Growing community of inventors

Kanagawa, Japan

Kazuhiro Yamakawa