A21
A21 (Carbon Steel Axles, Non-Heat-Treated and Heat-Treated, for Railway Use)· ASTM (United States) · 4 materials
| Designation | Material group | |
|---|---|---|
| A 21 Grade F | Structural and constructional steels | chevron_right |
| A 21 Grade G | Structural and constructional steels | chevron_right |
| A 21 Grade H | Structural and constructional steels | chevron_right |
| A 21 Grade U | Structural and constructional steels | chevron_right |