4J32, 4J36, Nb-lnvar low expansion alloy

Alloy

Mn

Cu

Ni

Co

Fe

4J32

0.20~0.60

0.40~0.80

31.5~33.0

3.20~4.20

margin

4J36

0.20~0.60

-

35.0~37.0

-

margin

Nb-lnvar

0.60

Nb≤0.50

30.0~35.0

3.0~5.0

margin

Alloy

Sample processing

Average linear expansion coefficient    a/10^-6·K^-1

20~100℃

-40~20℃

-20~20℃

4J32

The semi-finished product sample is heated to 840 ± 10 ° C, held for 1 hour, and quenched with water. After the sample is processed into a finished sample, it is held at 315 ± 10 ° C for 1 hour with the furnace cooling or air cooling.

-

≤1.0

-

4J36

-

≤1.5

-

Nb-lnvar

≤0.5

≤0.60

≤0.5