SCr440
Data verifiedSCr440 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.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.38–0.43 |
| Si | 0.15–0.35 |
| Mn | 0.60–0.90 |
| P | ≤0.030 |
| S | ≤0.030 |
| Cr | 0.90–1.20 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Hardness (Q&T) | 28–38 HRC typical |
| Tensile strength | ≥930 MPa (Q&T reference) |
| Yield strength | ≥785 MPa (Q&T reference) |
| Density | 7.85 g/cm³ |
Heat treatment
Quench 850–870 °C oil; temper 500–650 °C to required hardness.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.7035 (41Cr4) |
| aisi | 5140 |
| jis | SCr440 (JIS G4053) |
| gb | 40Cr |
Compare side by side: SCr440 vs 5140 · SCr440 vs 40Cr
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Shafts, gears, bolts, tie rods and general machinery parts across Asian supply chains.
Processing: As 5140/40Cr: machines well, induction hardens readily, welds with preheat.
FAQ
- Is SCr440 exactly 40Cr?
- Functionally yes — the JIS and GB windows overlap almost completely (C 0.38–0.43 vs 0.37–0.44, Cr 0.90–1.20 vs 0.80–1.10). Only the governing standard on the certificate differs.
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Ask for a quotationVisit NasteelSource: JIS G4053 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.