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,Website: 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&4J280.120.020.021.000.700.500.2027.0~29.0BalanceNotes:1,Under condition that the average coefficient of the linear expansion meets the requirements of the standard, the content of chromium is allowed to deviate from the stated range. 2,The shape and dimensions of the alloys are in compliance with GB/T14985.Physical Property (see Table2 & Table 3) Table 2 Coefficient of Linear ExpansionGradeHeat Treatment of the SamplesAverage Coefficient of Linear Expansion20~530 C4J28Heat to 1100 20 C, hold for 15min., cool to room tempreture in the air.10.8~11.4Note:The hardness of the annealed strip should be no more than 170. Hardness inspection is not required when the thickness of the strip is less than 0.2mm.Table 4 Coefficient of Linear ExpansionGradeAverage Coefficient of Linear Expansion /(10-6/K)20~200 C20~300 C20~400 C20~450 C20~500 C20~600 C20~700 C20~800 C4J2810.010.510.8-11.111.211.611.6Specification:Sheet/Plate, Bar/Rod/Wire/Coil,Capillary/Pipe/Tube Size Range:1.Sheet---Thickness 0.1mm~3.5mm, width:& 300mm,Condition: cold rolled, bright, bright annealed2.Plate---Thickness 3.5mm~40.0mm,width:& 300mm,Condition: cold rolled, hot rolled, annealed3.Round Wire---Dia 0.1mm~Dia 5.0mm,Condition: cold drawn, bright, bright annealed4.Flat Wire---Dia 0.5mm~Dia 5.0mm,length:& 1000mm,Condition:flat rolled, bright annealed5.Bar---Dia 5.0mm~Dia 8.0mm,length:& 2000mm,Condition:cold drawn,bright, bright annealed---Dia 8.0mm~Dia 32.0mm,length:& 2500mm,Condition:hot rolled,bright, bright annealed---Dia 32.0mm~Dia 180.0mm,length:& 1300mm,Condition:hot forging,peeled, turned, hot treated6.Capillary---OD 8.0mm~1.0mm,ID 0.1mm~8.0mm,length:& 2500mm,Condition: cold drawn, bright, bright annealed7.Pipe---OD 120mm~8.0mm,ID 8.0mm~129mm,length:& 4000mm,Condition: cold drawn, bright, bright annealed
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