SCM415
Data verifiedSCM415 is the low-carbon Cr-Mo carburizing steel of JIS G4053 — the Japanese gear and pinion grade in the AISI 4118 class. Its 0.15% carbon core stays tough after carburizing while the case reaches the low-60s HRC.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.13–0.18 |
| Si | 0.15–0.35 |
| Mn | 0.60–0.85 |
| P | ≤0.030 |
| S | ≤0.030 |
| Cr | 0.90–1.20 |
| Mo | 0.15–0.25 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Case hardness (carburized) | 58–63 HRC |
| Core tensile | ≥835 MPa (Q&T reference) |
| Density | 7.85 g/cm³ |
Heat treatment
Carburize 900–930 °C; quench ≈850 °C oil; temper 150–200 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.7262 (15CrMo5, near) |
| aisi | 4118 (near) |
| jis | SCM415 (JIS G4053) |
| gb | 15CrMo (near) |
Compare side by side: SCM415 vs 4118 · SCM415 vs SCM420
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Small gears and pinions, camshafts, transmission parts, bolts and shafts needing a hard case on a tough core.
Processing: Machines well before carburizing; the Mo addition gives more uniform case hardening than plain Cr grades (SCr415 class).
FAQ
- SCM415 or SCM420?
- Same Cr-Mo carburizing family: SCM420 has more carbon (0.18–0.23%) and a stronger core, SCM415 carburizes with a slightly tougher, lower-strength core. Gear size and core-load decide.
Need SCM415 from stock?
Steel.Wiki is sponsored by Shenzhen NewAsia Special Steel (Nasteel), a special-steel stockholder in Shenzhen stocking mold, tool and alloy steels with EN 10204 3.1 certification.
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.