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
Mechanical properties — Pro
QT
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
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| Elongation | ||
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S355JR
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