Italy · UNI
C 55
UNI EN 10250-2 — Open die steel forgings for general engineering purposes. Non-alloy quality and special steels
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.52 | 0.6 | ||
| Cr | 0.4 | |||
| Cr+Mo+Ni | 0.63 | |||
| Mn | 0.6 | 0.9 | ||
| Mo | 0.1 | |||
| Ni | 0.4 | |||
| P | 0.045 | |||
| S | 0.045 | |||
| Si | 0.4 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| die forgings, forgings, normalized or normalized and tempered, <= 100 mm, forged bars | 330 | 640 | 12 | |||
| die forgings, forgings, normalized or normalized and tempered, > 100 <= 250 mm, forged bars | 300 | 620 | 9；12 | |||
| die forgings, forgings, normalized or normalized and tempered, > 250 <= 500 mm, forged bars | 260 | 600 | 9；12 | |||
| die forgings, forgings, normalized or normalized and tempered, > 500 <= 1000 mm, forged bars | 250 | 590 | 8；11 | |||
| die forgings, HB, forgings, annealed | 锻制棒材 229.00 |
Fatigue
| Item | Detail |
|---|---|
| Product | Semi Finished products; Thickness: <= 16 mm; +QT |
| Experiment | Reversed bending; T: 20°C |
| Specimen |
| Property | Value |
|---|---|
| Yield strength (MPa) | 550.0 |
| Tensile strength (MPa) | 800.0 950.0 |
| Elongation (%) | 12.0 |
| Reduction of area (%) | 30.0 |
| No. | Cycles |
|---|---|
| 1 | 1E7 |
Heat treatment
| Type | 1 |
|---|---|
| Heat-treatment curve | Hardness-Tempering |