SCr440 vs 40Cr
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
SCr440
Alloy & Engineering Steel
SCr440 is the JIS designation of the 5140/40Cr chromium through-hardening steel — the designation on Japanese, Korean and Taiwanese certificates for the same grade the Americas call 5140 and China calls 40Cr.
Standards: DIN 1.7035 (41Cr4) · AISI 5140 · JIS SCr440 (JIS G4053) · GB 40Cr
40Cr
Alloy & Engineering Steel
40Cr is China’s most-used alloy structural steel (GB/T 3077) — a Cr steel equivalent to AISI 5140 and JIS SCr440, stocked everywhere in China as round bar.
Standards: DIN 1.7035 (41Cr4) · AISI 5140 · JIS SCr440 · GB 40Cr
Chemical composition compared (%)
| Element | SCr440 | 40Cr |
|---|---|---|
| C | 0.38–0.43 | 0.37–0.44 |
| Si | 0.15–0.35 | 0.17–0.37 |
| Mn | 0.60–0.90 | 0.50–0.80 |
| P | ≤0.030 | — |
| S | ≤0.030 | — |
| Cr | 0.90–1.20 | 0.80–1.10 |
Properties compared
| Property | SCr440 | 40Cr |
|---|---|---|
| Hardness (Q&T) | 28–38 HRC typical | 28–38 HRC typical |
| Tensile strength | ≥930 MPa (Q&T reference) | ≥980 MPa (Q&T reference, GB/T 3077) |
| Yield strength | ≥785 MPa (Q&T reference) | — |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: SCr440 · 40Cr. Substitution decisions for certified parts stay with the design authority.