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) (EN 10083-2) vs C55E / 1.1203 (EN) (EN 10083-2)
| Element | C55E (EN) | C55E / 1.1203 (EN) | Overlap |
|---|---|---|---|
| C | 0.52–0.6% | 0.52–0.6% | 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 | 800–950 | MPa |
| Yield Strength | 500–600 | MPa |
| Elongation | 12–16 | % |
| Elastic Modulus | ≥ 210 | GPa |
| Density | ≥ 7.85 | g/cm3 |
Compatibility verdict
C55E and C55E / 1.1203: 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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