C10E
1.1121Lowest practical carbon case-hardening steel — 0.07-0.13% C. After carburizing: hard surface (HRC 55-60) with extremely soft, tough core (HRC 15-20). Maximum impact absorption. Modern designation for Ck10. Used for pins, bushings, small gears, camshaft lobes, and any carburized part where maximum core toughness and ductility are critical. Also used as cold-heading and deep-drawing wire/strip.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1010 | — | REF |
| 🇪🇺 | EN | Europe | C10E / 1.1121 | 1.1121 | 100% |
Sources: ASTM A29, EN 10084
Chemical composition comparison (wt%)
Side-by-side: C10E (EN 10084) vs C10E / 1.1121 (EN) (EN 10084)
| Element | C10E (EN 10084) | C10E / 1.1121 (EN) | Overlap |
|---|---|---|---|
| C | — | 0.07–0.13% | — |
| Si | — | 0–0.4% | — |
Mechanical properties
Compatibility verdict
C10E and C10E / 1.1121: 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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