35CrMo vs 34CrMo4
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.
35CrMo
Alloy & Engineering Steel
35CrMo is the GB/T 3077 Cr-Mo steel between 4130 and 4140 in carbon, matching AISI 4135 and JIS SCM435 — a staple Chinese grade for Q&T shafts and high-strength fasteners.
Standards: DIN 1.7220 (34CrMo4, near) · AISI 4135 · JIS SCM435 · GB 35CrMo (GB/T 3077)
34CrMo4
Alloy & Engineering Steel
34CrMo4 is the EN Q&T Cr-Mo steel (1.7220) one step below 42CrMo4, the European counterpart of the 4135/SCM435 family. It is widely used for gas cylinders, shafts and high-strength fasteners.
Standards: DIN 1.7220 (34CrMo4) · AISI 4135 (near) · JIS SCM435 (near) · GB 35CrMo (near)
Chemical composition compared (%)
| Element | 35CrMo | 34CrMo4 |
|---|---|---|
| C | 0.32–0.40 | 0.30–0.37 |
| Si | 0.17–0.37 | ≤0.40 |
| Mn | 0.40–0.70 | 0.60–0.90 |
| P | ≤0.035 | ≤0.025 |
| S | ≤0.035 | ≤0.035 |
| Cr | 0.80–1.10 | 0.90–1.20 |
| Mo | 0.15–0.25 | 0.15–0.30 |
Properties compared
| Property | 35CrMo | 34CrMo4 |
|---|---|---|
| Tensile strength | ≥985 MPa (GB/T 3077 reference Q&T) | 800–1100 MPa (Q&T, EN 10083 section bands) |
| Yield strength | ≥835 MPa (reference) | — |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Hardness (Q&T) | — | 28–40 HRC typical |
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: 35CrMo · 34CrMo4. Substitution decisions for certified parts stay with the design authority.