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Alloy 27 4J28 alloy Strip controlled expansion alloys
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Product Details
Place of Origin: | Shaanxi, China | Brand Name: | Xi'an Gangyan | Application: | Sealing with soft glass in vacumm atmosphere |
Shape: | Strip | Material: | Expansion alloy | Dimensions: | Strip |
Chemical Composition: | Fe-28Cr |
Product Description
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 | |
≤ | |||||||||
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 |
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 /(10-6/K) | |||||||
20~200℃ | 20~300℃ | 20~400℃ | 20~450℃ | 20~500℃ | 20~600℃ | 20~700℃ | 20~800℃ | |
4J28 | 10.0 | 10.5 | 10.8 | - | 11.1 | 11.2 | 11.6 | 11.6 |
Usage: It is applied to seal the equipment of the electric component with the soft glass.
Specification: Sheet/Plate, Bar/Rod/Wire/Coil,Capillary/Pipe/Tube
We could do any other products with specified technical standard, say, ASTM,SAE,DIN,S.E.W.,JIS,ISO,IEC,NF,BS,. PLS contact us for more information: Tel: +86-29-33669103 or E-mail us at: sales@xagy.cn
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 | |
≤ | |||||||||
4J28 | 0.12 | 0.02 | 0.02 | 1.00 | 0.70 | 0.50 | 0.20 | 27.0~29.0 | Balance |
Contact Us
- Xi'an Gangyan Special Alloy Co., Ltd.
- Contact nameMichelle Lee
- Phone86-29-33669103
- AddressNo. 88, East Of Century Avenue
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