Italy · UNI
C 40
UNI EN 10083-2 — Steels for quenching and tempering. Technical delivery conditions for non alloy steels
Chemical composition
wt% · log scale- min – max range
- typical value
Mechanical properties
value range by conditionChemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.37 | 0.44 | ||
| Cr | 0.4 | |||
| Cr+Mo+Ni | 0.63 | Restriction in the carbon range to 0.05% and/or the total sum of the elements Cr | Restriction in the carbon range to 0.05% and/or the total sum of the elements Cr | |
| Mn | 0.5 | 0.8 | ||
| Mo | 0.1 | |||
| Ni | 0.4 | |||
| P | 0.045 | |||
| S | 0.045 | Steels with improved machinability as a result of the addition of lead or higher S contents up to around 0.1% | Steels with improved machinability as a result of the addition of lead or higher S contents up to around 0.1% | |
| Si | 0.4 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| bars, open die forgings and die forgings +N, 100 < d <= 250 mm, flats | 260.00 | 530.00 | 17.00 | |||
| bars, open die forgings and die forgings +N, 16 < d <= 100 mm, flats | 290.00 | 550.00 | 17.00 | |||
| bars, open die forgings and die forgings +N, d <= 16 mm or t <= 16 mm, flats | 320.00 | 580.00 | 16.00 | |||
| bars, open die forgings and die forgings +QT, 16 < d < 40 mm or 8 < t <= 20 mm | t - 厚度) | t - 厚度) | t - 厚度) | t - 厚度) | ||
| bars, open die forgings and die forgings +QT, 40 < d < 100 mm or 20 < t <= 60 mm | t - 厚度) | t - 厚度) | t - 厚度) | t - 厚度) | ||
| bars, open die forgings and die forgings +QT, d <= 16 mm or t <= 8 mm | t - 厚度) | t - 厚度) | t - 厚度) | t - 厚度) |
Heat treatment
| Type | 1 |
|---|---|
| Heat-treatment curve | Hardness-Tempering |