Canada · CSA
70AT
G40.20/G40.21 — General requirements for rolled or welded structural quality steel/Strucrtural quality steel
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.2 | |||
| Cr | 0.7 | |||
| Cr+Ni | 0.4 | |||
| Cu | 0.2 | 0.6 | ||
| Mn | 1 | 1.6 | ||
| Nb+V | 0.12 | |||
| Ni | 0.25 | 0.5 | ||
| P | 0.025 | |||
| S | 0.035 | |||
| Si | 0.15 | 0.4 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| bars, sections, rolled, <= 20 mm, heavy plate | 480 | 590 790.00 | 22 | 27 |