This specification covers a premium aircraft-quality, double vacuum-melted low-alloy steel in the form of bars, forgings and forging stock.
It is used typically for parts such as bearings operating under heavy loads and high speeds at moderate temperatures up to 600° F. E.g. bearings and rolling elements, bearing balls and races.
| Market grade | DIN |
|---|---|
| M50 | 1.3551 |
| AMS |
|---|
| 6491 |
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