China · GB
50
GB/T 3078:2008 — Technical requirements for quality structural steel cold drawn bars
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.47 | 0.55 | ||
| Cr | 0.25 | |||
| Cu | 0.25 | |||
| Mn | 0.5 | 0.8 | ||
| Ni | 0.3 | |||
| P | 0.035 | |||
| S | 0.035 | |||
| Si | 0.17 | 0.37 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| bars, cold drawn | ≥655 | ≥6 | ≥30 | HB ≤255 HBW | ||
| bars, annealed | ≥560 | ≥12 | ≥40 | |||
| bars, annealed or normalized and tempered | HB ≤229 HBW |