C55
1.0535Medium-high carbon unalloyed steel. Higher strength than C45 with reduced weldability. Used for rail wheels, agricultural equipment, springs, hand tools, and wear-resistant parts. Often used for induction-hardened components.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI 1055 | G10550 | REF |
| 🇪🇺 | EN | Europe | C55 | 1.0535 | 100% |
| 🇯🇵 | JIS | Japan | S55C | — | 97% |
| 🇨🇳 | GB | China | 55 | — | 95% |
Sources: ASTM A29, EN 10083-2:2006, JIS G4051, GB/T 699
Mechanical properties
Compatibility verdict
C55 and S55C: 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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