Ck60 / C60E
1.1221Plain carbon quenched & tempered steel — 0.57-0.65% C. Highest practical C for Q&T without excessive brittleness. Good surface hardness (HRC 55-60) with adequate core toughness. Modern designation C60E (EN 10083-2), traditional Ck60 still widely used. Used for crankshafts, connecting rods, rail wheels, axles, and machine tool spindles where alloy cost is not justified.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1060 | — | REF |
| 🇪🇺 | EN | Europe | C60E / 1.1221 | 1.1221 | 100% |
Sources: ASTM A29, EN 10083-2
Chemical composition comparison (wt%)
Side-by-side: Ck60 / C60E (EN 10083-2) vs C60E / 1.1221 (EN) (EN 10083-2)
| Element | Ck60 / C60E (EN 10083-2) | C60E / 1.1221 (EN) | Overlap |
|---|---|---|---|
| C | — | 0.57–0.65% | — |
| Si | — | 0–0.4% | — |
Mechanical properties
Compatibility verdict
Ck60 / C60E and C60E / 1.1221: 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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