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BYP21 (4J38) is a kind of iron-nickel alloy with a low linear expansion coefficient, falling into the category of low expansion alloy. This product is suitable for the production of high-precision instrument parts with constant size, a field reliant on the capabilities of precision expansion alloys. Similar alloy's names in different trademark systems:
Beiye | China Standard | America |
BYP21 | 4J38 | 36NiFM Invar Free achining Simonds 38~7 FM |
| Ni | 35.0～37.0 |
| Se | 0.10～0.25 |
Fe | bal. |
| 25℃-100℃ | ≤1.5 (α, 10-6℃-1) |
Don’t hesitate to contact Beiye for a quote on BYP21 alloy and our precision alloy and supply.
