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See Chinese contents: YB/T 5235-2005 YB/T 5235-2005: Sealed iron-nickel-chromium, iron-nickel alloy with permanent expansion
This Standard specifies the size, shape, technical requirements, test methods, inspection rules, packaging, marking, and quality certificates, etc. of iron-nickelchromium 4J6, 4J47, 4J49 alloy and iron-nickel 4J42, 4J45, 4J50 alloy. This Standard is applicable to sealed iron-nickel-chromium and iron-nickel alloy with permanent expansion matched sealed on electrical components with soft glass or ceramic.
