SCM435
Data verifiedSCM435 is the JIS Cr-Mo through-hardening steel matching AISI 4135 and EN 34CrMo4 — one step below SCM440/4140 in carbon, with slightly easier welding and machining at nearly the same Q&T strength level. It is a staple of Japanese bolt, shaft and machinery production.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.33–0.38 |
| Si | 0.15–0.35 |
| Mn | 0.60–0.90 |
| P | ≤0.030 |
| S | ≤0.030 |
| Cr | 0.90–1.20 |
| Mo | 0.15–0.30 |
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 550–650 °C to required hardness.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.7220 (34CrMo4) |
| aisi | 4135 |
| jis | SCM435 (JIS G4053) |
| gb | 35CrMo |
Compare side by side: SCM435 vs 4135 · SCM435 vs 34CrMo4 · SCM435 vs SCM440
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: High-strength bolts and studs, shafts, connecting rods, machine components, pressure parts.
Processing: As 4135/34CrMo4: machines well annealed, welds with preheat (150–250 °C) and low-hydrogen practice.
FAQ
- SCM435 or SCM440?
- SCM440 (4140 class) has more carbon and hardens a little deeper; SCM435 is chosen where its 930 MPa class strength suffices and weldability or machining matters more.
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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.