C50E
1.1206High-carbon unalloyed Q&T steel — 0.47-0.55% C. Higher strength than C45E at the expense of reduced weldability and toughness. Modern designation for Ck50. Suitable for induction hardening to HRC 55-60. Used for heavy-duty shafts, rail wheels, clutch plates, and springs where maximum unalloyed strength is needed. Also used for agricultural equipment and wear parts.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1050 | — | REF |
| 🇪🇺 | EN | Europe | C50E / 1.1206 | 1.1206 | 100% |
Sources: ASTM A29, EN 10083-2
Chemical composition comparison (wt%)
Side-by-side: C50E (EN) (EN 10083-2) vs C50E / 1.1206 (EN) (EN 10083-2)
| Element | C50E (EN) | C50E / 1.1206 (EN) | Overlap |
|---|---|---|---|
| C | 0.47–0.55% | 0.47–0.55% | OK |
| Si | 0–0.4% | 0–0.4% | OK |
| Mn | 0.6–0.9% | 0.6–0.9% | OK |
| P | 0–0.025% | 0–0.025% | OK |
| S | 0–0.025% | 0–0.025% | OK |
Mechanical properties
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | 750–900 | MPa |
| Yield Strength | 490–580 | MPa |
| Elongation | 13–17 | % |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Heat treatment
| Process | Temperature | Medium | Holding Time | Notes |
|---|---|---|---|---|
| hardening | 820–850 °C | oil/water | — | Oil preferred — less crack risk than water |
| tempering | 400–600 °C | air | 1-2h | Adjust for target strength |
Compatibility verdict
C50E and C50E / 1.1206: 100% composition match
Close equivalents but NOT identical.
Related materials
S355JR
1.0045High-strength low-alloy structural steel with minimum yield strength of 355 MPa. Standard grade for bridges, buildings, cranes, and general structural applications. Impact tested at +20°C (JR).
S690QL
1.8928High-strength quenched and tempered fine-grain structural steel with minimum yield strength of 690 MPa. Used for heavily loaded structures like mobile cranes, mining equipment, bridges, and pressure vessels.
S275JR
1.0044Medium-strength structural steel with minimum yield strength of 275 MPa. Bridges the gap between S235JR and S355JR. Used for general structural applications, lattice towers, masts, and light crane components. Impact tested at +20°C (JR).
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