Glass Sealed And Controlled Expansion Alloys

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2017-09-14 05:44
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Precision Alloy 4J28

The 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 4J28

Note: 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 Composition

Grade	Chemical Composition (%)
	C	P	S	Mn	Si	Ni	N	Cr	Fe
	≤							Cr	Fe
4J28	0.12	0.02	0.02	1.00	0.70	0.50	0.20	27.0~29.0	Balance

Notes: 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 Expansion

Grade	Heat Treatment of the Samples	Average Coefficient of Linear Expansion
Grade	Heat Treatment of the Samples	20~530°C
4J28	Heat to 1100±20°C, hold for 15min., cool to room tempreture in the air.	10.8~11.4

Note: 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 Expansion

Grade	Average Coefficient of Linear Expansion ã/(10^-6/K)
Grade	20~200°C	20~300°C	20~400°C	20~450°C	20~500°C	20~600°C	20~700°C	20~800°C
4J28	10.0	10.5	10.8	-	11.1	11.2	11.6	11.6

Specification: 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 annealed

2.Plate---Thickness 3.5mm~40.0mm,width:≤300mm,Condition: cold rolled, hot rolled, annealed

3.Round Wire---Dia 0.1mm~Dia 5.0mm,Condition: cold drawn, bright, bright annealed

4.Flat Wire---Dia 0.5mm~Dia 5.0mm,length:≤1000mm,Condition:flat rolled, bright annealed

5.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 treated

6.Capillary---OD 8.0mm~1.0mm,ID 0.1mm~8.0mm,length:≤2500mm,Condition: cold drawn, bright, bright annealed

7.Pipe---OD 120mm~8.0mm,ID 8.0mm~129mm,length:≤4000mm,Condition: cold drawn, bright, bright annealed

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