4135
Data verified4135 is the mid-carbon Cr-Mo Q&T steel one step below 4140, matching JIS SCM435 and GB 35CrMo almost exactly. It is a staple of Asian and European bar trade for shafts and high-strength bolts.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.33–0.38 |
| Si | 0.15–0.35 |
| Mn | 0.70–0.90 |
| P | ≤0.035 |
| S | ≤0.040 |
| Cr | 0.80–1.10 |
| Mo | 0.15–0.25 |
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 | 850–1050 MPa (Q&T, typ.) |
| Density | 7.85 g/cm³ |
Heat treatment
Normalize 870 °C; quench 850 °C oil; temper 500–650 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.7220 (34CrMo4, near) |
| aisi | 4135 |
| jis | SCM435 |
| gb | 35CrMo |
Compare side by side: 4135 vs 34CrMo4 · 4135 vs 4140
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Shafts, bolts, gears, hydraulic parts, connecting rods.
Processing: Machines well; preheat 200–300 °C for welding; often supplied prehardened.
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Ask for a quotationVisit NasteelSource: SAE J404 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.