France · AFNOR NF
30 CD 12
NF F 80-107
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.28 | 0.35 | ||
| Cr | 2.8 | 3.5 | ||
| Fe | Bal | Bal | ||
| Mn | 0.4 | 0.7 | ||
| Mo | 0.3 | 0.5 | ||
| 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 |
|---|---|---|---|---|---|---|
| bars, wire, Heat treated, <= 16 mm, steel bars | 880 | 1080 1280.00 | 10 | 50 | ||
| bars, wire, Heat treated, > 100 <= 160 mm, steel bars | 730 | 930 1130.00 | 12 | 60 | ||
| bars, wire, Heat treated, > 16 <= 40 mm, steel bars | 810 | 1030 1230.00 | 10 | 60 | ||
| bars, wire, Heat treated, > 160 <= 250 mm, steel bars | 700 | 880 1180.00 | 12 | 60 | ||
| bars, wire, Heat treated, > 40 <= 100 mm, steel bars | 770 | 980 1180.00 | 11 | 60 |
Heat treatment
| Type | 1 |
|---|---|
| Heat-treatment curve | CCT modified |
| Heat-treatment curve | Hardness-Tempering |
| Heat-treatment curve | TTT |
| Heat-treatment curve | CCT |
| Heat-treatment curve | 淬透性 |
| Heat-treatment curve | Tempered |