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 — Pro
Carburized QT
| Property | Value | Unit |
|---|---|---|
| Hardness HRC |
As Received
| Property | Value | Unit |
|---|---|---|
| Hardness HB | ||
| Elastic Modulus | ||
| Density |
Normalized
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Yield Strength |
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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).
S690QL
1.8928High-strength quenched and tempered fine-grain structural steel with minimum yield strength of 690 MPa. Used for heavily loaded structures like mobile cranes, mining equipment, bridges, and pressure vessels.
S275JR
1.0044Medium-strength structural steel with minimum yield strength of 275 MPa. Bridges the gap between S235JR and S355JR. Used for general structural applications, lattice towers, masts, and light crane components. Impact tested at +20°C (JR).
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