United Kingdom · B.S.
685 A 57
BS 970-2:1988 — BS 970-2
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.55 | 0.6 | ||
| Cr | 0.6 | 0.85 | ||
| Cu | 0.35 | |||
| Mn | 0.7 | 0.9 | ||
| Ni | 0.4 | |||
| P | 0.035 | |||
| S | 0.035 | |||
| Si | 1.2 | 1.6 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| flats, HB | 圆钢 退火 d = 40 mm 277 |