C40
1.0511Medium-carbon unalloyed steel between C35 and C45 in properties. Good balance of strength and machinability. Used for moderately stressed machine parts, shafts, studs, axles, and crankshafts.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1040 | G10400 | REF |
| 🇪🇺 | EN | Europe | C40 | 1.0511 | 100% |
Sources: ASTM A29, EN 10083-2:2006
Chemical composition comparison (wt%)
Side-by-side: C40 (EN 10083-2) vs C40 (EN) (EN 10083-2:2006)
| Element | C40 (EN 10083-2) | C40 (EN) | Overlap |
|---|---|---|---|
| C | — | 0.37–0.44% | — |
| Si | — | 0–0.4% | — |
Mechanical properties
Compatibility verdict
C40 and C40: 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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