C15
1.0401Low-carbon unalloyed case-hardening steel. The simplest and most economical case-hardening grade. Used for lightly loaded gears, pins, bushings, rivets, and small machine parts where a hard wear-resistant surface with a soft tough core is needed.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1015 | G10150 | REF |
| 🇪🇺 | EN | Europe | C15 | 1.0401 | 100% |
| 🇯🇵 | JIS | Japan | S15C | — | 97% |
| 🇨🇳 | GB | China | 15 | — | 95% |
Sources: ASTM A29, EN 10084:2008, JIS G4051, GB/T 699
Mechanical properties
Compatibility verdict
C15 and S15C: 97% 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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