France · AFNOR NF
20 NC 6
NF F 80-107
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.16 | 0.21 | ||
| Cr | 0.9 | 1.2 | ||
| Mn | 0.6 | 0.9 | ||
| Ni | 1.2 | 1.5 | ||
| 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 | 850 | 1200 1550.00 | 8 | 50 | ||
| bars, wire, Heat treated, > 16 <= 40 mm, steel bars | 700 | 950 1300.00 | 9 | 60 | ||
| bars, wire, Heat treated, > 40 <= 100 mm, steel bars | 550 | 750 1100.00 | 10 | 60 | ||
| bars, wire, quenched and tempered, <= 16 mm, steel bars | 650 | 800 1100.00 | 16 | 80 | ||
| bars, wire, quenched and tempered, > 16 <= 40 mm, steel bars | 600 | 750 900.00 | 17 | 80 | ||
| bars, wire, quenched and tempered, > 40 <= 100 mm, steel bars | 550 | 700 850.00 | 18 | 90 | ||
| bars, HB, wire | 钢棒 163 217.00；钢棒 207.00 |
Heat treatment
| Type | 1 |
|---|---|
| Heat-treatment curve | TTT |
| Heat-treatment curve | Hardness-Tempering |
| Heat-treatment curve | CCT |
| Heat-treatment curve | 淬透性 |