C55E
1.1203High-carbon unalloyed Q&T steel — 0.52-0.60% C. Modern designation for Ck55. Good strength after Q&T (UTS 800-950 MPa) and excellent surface hardness after induction hardening (HRC 56-60). Used for rail wheels, crankshafts, heavy-duty shafts, and wear parts.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1055 | — | REF |
| 🇪🇺 | EN | Europe | C55E / 1.1203 | 1.1203 | 100% |
Sources: ASTM A29, EN 10083-2
Chemical composition comparison (wt%)
Side-by-side: C55E (EN 10083-2) vs C55E / 1.1203 (EN) (EN 10083-2)
| Element | C55E (EN 10083-2) | C55E / 1.1203 (EN) | Overlap |
|---|---|---|---|
| C | — | 0.52–0.6% | — |
| Si | — | 0–0.4% | — |
Mechanical properties
Compatibility verdict
C55E and C55E / 1.1203: 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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