AISI 4135 (35CrMo) vs 40CrNiMo6: 46% composition overlap. Significantly different materials serving different application areas.
AISI 4135 (35CrMo) vs 40CrNiMo6
Side-by-side chemical composition and mechanical property comparison.
Overview
AISI 4135 (35CrMo)
Cr-Mo quench-and-temper alloy steel — the lower-carbon version of 4140 (42CrMo4). Lower C (0.33-0.38%) gives better weldability and toughness than 4140 with slightly lower strength. Primarily a US/ASTM designation. Used for drill pipe, tubing, couplings, and oil field applications where weldability matters more than maximum strength.
40CrNiMo6
1.6565
High-strength Cr-Ni-Mo quench and temper steel. Higher C than 34CrNiMo6 for greater strength, with excellent hardenability from Ni+Mo combination. Used for heavy-duty crankshafts, connecting rods, high-strength bolts (class 12.9), gears, and critical structural components in large cross-sections.
| AISI 4135 (35CrMo) | 40CrNiMo6 | |
|---|---|---|
| Material Number | — | 1.6565 |
| Category | Alloy Steel | Alloy Steel |
| Standard | ASTM A29 | EN 10083-3 |
Chemical composition (wt%) — Pro
| Element | AISI 4135 (35CrMo) | 40CrNiMo6 | Overlap |
|---|---|---|---|
| C | 0.33–0.38% | 0.36–0.44% | Partial |
| Si | 0.15–0.35% | 0–0.4% | OK |
| Mn | 0.7–0.9% | 0.5–0.8% | Partial |
| P | 0–0.035% | 0–0.025% | OK |
| S | |||
| Cr | |||
| Mo | |||
| Ni |
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Sign up free — 3 comparisons/day freeMechanical properties — Pro
| Property | AISI 4135 (35CrMo) | 40CrNiMo6 | Unit |
|---|---|---|---|
| Tensile Strength | 860–1060 | 1000–1200 | MPa |
| Yield Strength | 690–860 | ≥ 800 | MPa |
| Elongation | ≥ 12 | ≥ 10 | % |
| Elastic Modulus | |||
| Density |
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Sign up free — 3 comparisons/day freeCompatibility Assessment
AISI 4135 (35CrMo) and 40CrNiMo6 have significantly different compositions (46% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is AISI 4135 (35CrMo) the same as 40CrNiMo6?
AISI 4135 (35CrMo) and 40CrNiMo6 have a 46% composition overlap. They are generally not directly interchangeable.
Can I replace AISI 4135 (35CrMo) with 40CrNiMo6?
Generally not recommended. The compositions differ significantly (46% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between AISI 4135 (35CrMo) and 40CrNiMo6?
The main differences are in the following elements: C, Mn, Cr. AISI 4135 (35CrMo) is a Alloy Steel grade, while 40CrNiMo6 is a Alloy Steel grade.
Related Comparisons
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Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.