China · GB
50
GB/T 34484.1:2017 — Heat-treatable steels-Part 1:Non-alloy steels
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.47 | 0.55 | ||
| Cr | 0.4 | |||
| Cr+Mo+Ni | 0.63 | |||
| Cu | 0.3 | |||
| Mn | 0.6 | 0.9 | ||
| Mo | 0.1 | |||
| Ni | 0.4 | |||
| P | 0.035 | |||
| S | 0.035 | |||
| Si | 0.1 | 0.4 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| steel products, normalized, <= 20mm | ≥355 | ≥650 | ≥12 | |||
| steel products, normalized, > 100mm <= 310mm | ≥290 | ≥590 | ≥14 | |||
| steel products, normalized, > 20mm <= 100mm | ≥320 | ≥610 | ≥14 | |||
| steel products, quenched and tempered, 20 < d <= 40mm, d | ≥460 | 700–850 | ≥15 | ≥35 | ||
| steel products, quenched and tempered, 20 < t <= 60mm, t | ≥400 | 650–800 | ≥16 | ≥40 | ||
| steel products, quenched and tempered, 40 < d <= 100mm, d | ≥400 | 650–800 | ≥16 | ≥40 | ||
| steel products, quenched and tempered, d <= 20mm, d | ≥520 | 600–750 | ≥13 | ≥30 |