Chemical Composition(% weight):
Grade NO. | C | Mn | S | P | Si | Ni |
0.18~0.32 | 0.20~0.40 | ≤0.02 | ≤0.02 | 0.15~0.40 | 34.0~40.0 | |
INVAR | Mo | V | W | Nb | Ti | Co |
0~3.0 | 0~1.0 | 0~3.0 | 0~1.0 | 0~0.5 | 0~3.5 |
Properties Requirements:
Grade NO. | Mechanical Properties | Expansion Properties ×10-6/℃ | |||||
Rm(MPa) | Rp0.2 (MPa) | A250 | Twist 100d (times) | α RT~100℃ | α 100~240℃ | α RT~300℃ | |
INVAR | ≥1050 | ≥900 | ≥1.5 | ≥20 | ≤2.8 | ≤3.6 | ≤8.0 |