Within a certain range of temperature, nickel iron expansion alloy wire has similar coefficient of expansion ratio to sealing material of glass and ceramics,to achieve matched sealing, therefore, it is also called sealing alloy.
Chemical Composition
Grade
| Composition %
| standard
| C
| P
| S
| Mn
| SI
| Al
| Ni
| Fe
| Not bigger than
| 4J45
| 0.05
| 0.020
| 0.020
| 0.80
| 0.30
| 0.10
| 44.5-45.5
| bal
| YB/T5235-93
| 4J50
| 0.05
| 0.020
| 0.020
| 0.80
| 0.30
| 0.10
| 49.5-50.5
| bal
|
Size and tolerance unit：mm
Dia
| 0.10-0.20
| ＞0.20-0.30
| ＞0.30-0.50
| ＞0.50-1.50
| ＞1.50-3.00
| ＞3.00-7.00
| 执行标准
| Tolerance（±）
| 0.005
| 0.008
| 0.010
| 0.015
| 0.020
| 0.030
| GB/T14985-94
|
Properties
Grade
| Average expansion ratio,Z10-6/℃
| Standard
| 20-300℃
| 20-400℃
| 4J45
| 6.5-7.2
| 6.5-7.2
| YB/T5235-93
| 4J50
| 9.2-10.0
| 9.2-9.9
|
|
