C30E
1.1178Mid-carbon unalloyed Q&T steel — 0.27-0.34% C. Between C22E and C35E — good weldability with moderate strength after Q&T. Modern designation for Ck30. Used for lightly loaded shafts, levers, bolts, and machine parts.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1030 | — | REF |
| 🇪🇺 | EN | Europe | C30E / 1.1178 | 1.1178 | 100% |
Sources: ASTM A29, EN 10083-2
Chemical composition comparison (wt%)
Side-by-side: C30E (EN 10083-2) vs C30E / 1.1178 (EN) (EN 10083-2)
| Element | C30E (EN 10083-2) | C30E / 1.1178 (EN) | Overlap |
|---|---|---|---|
| C | — | 0.27–0.34% | — |
| Si | — | 0–0.4% | — |
Mechanical properties
Compatibility verdict
C30E and C30E / 1.1178: 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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