Glass Sealed And Controlled Expansion Alloys

Precision Alloy 4J28The application of Precision Alloy 4J28:It is applied to seal the equipment of the electric component with the soft glass.Glass sealed and controlled expansion alloys *Alloy 27,ASTM F-256,UNS K92801,(Fe-28Cr),Chinese 4J28Note:Glass Sealing "27" Alloy,it's glass-to-metal sealing and iron-chromium alloy.Nominally 28 % chromium, in strip, bar, wire, and rod forms intended primarily for sealing to glass in electronic applications.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.Grade and Chemical Composition (see Table 1) Table 1 Grade and Chemical CompositionGradeChemical Composition (%)CPSMnSiNiNCrFe
Glass Sealed And Controlled Expansion Alloys