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 10083-2) vs C50E / 1.1206 (EN) (EN 10083-2)
| Element | C50E (EN 10083-2) | C50E / 1.1206 (EN) | Overlap |
|---|---|---|---|
| C | — | 0.47–0.55% | — |
| Si | — | 0–0.4% | — |
Mechanical properties
Compatibility verdict
C50E and C50E / 1.1206: 100% composition match
Related materials
C45
1.0503Medium carbon unalloyed quality steel. Good machinability and moderate strength after heat treatment. Widely used for shafts, spindles, pins, studs, and general machine parts.
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).
S235JR
1.0038General-purpose structural steel with minimum yield strength of 235 MPa. The most common structural steel grade in Europe for general construction, frames, and non-critical structural applications.
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