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1.1 ,This specification covers two chromium-iron alloys, the former, (UNS K91800), nominally 18 ,% chromium, balance iron, the latter, (UNS K92801), nominally 28 ,% chromium, in strip, bar, wire, and rod forms intended primarily for sealing to glass in electronic applications.
Note 1: ,UNS K92801 should only be considered for use at service temperatures below 300°,C. The alloy is prone to sigma phase formation at temperatures close to 620°,C, and exhibits brittle mechanical behavior after prolonged exposures at temperatures close to 475°,C.