40CrMnMo7 vs 40CrMnNiMo8-6-4: 100% composition overlap. Very similar materials, likely interchangeable for most applications.
40CrMnMo7 vs 40CrMnNiMo8-6-4
Side-by-side chemical composition and mechanical property comparison.
Overview
40CrMnMo7
1.2311
Pre-hardened plastic mold steel — delivered at 28-32 HRC, ready for machining without further heat treatment. The European equivalent of AISI P20. Cr-Mn-Mo composition for good through-hardenability in large sections. THE workhorse mold base material for injection molds, compression molds, and die casting dies. Good machinability, polishability, and photo-etchability. Used for mold frames, large injection molds, blow molds, and structural die components.
40CrMnNiMo8-6-4
1.2738
Pre-hardened mould steel with nickel addition for uniform hardness through large cross-sections. Delivered at 280-325 HB. The Ni addition (0.90-1.20%) provides better through-hardening than 1.2311/1.2312, making it suitable for large moulds with sections >400mm. Used for large injection moulds for automotive, household appliance, and furniture industry. The standard choice for large, complex mould frames. Similar to AISI P20+Ni.
| 40CrMnMo7 | 40CrMnNiMo8-6-4 | |
|---|---|---|
| Material Number | 1.2311 | 1.2738 |
| Category | Tool Steel | Tool Steel |
| Standard | EN ISO 4957 | EN ISO 4957 |
Chemical composition (wt%)
| Element | 40CrMnMo7 | 40CrMnNiMo8-6-4 | Overlap |
|---|---|---|---|
| C | 0.35–0.45% | 0.35–0.45% | OK |
| Si | 0.2–0.4% | 0.2–0.4% | OK |
| Mn | 1.3–1.6% | 1.3–1.6% | OK |
| P | 0–0.03% | ≤ 0.03% | OK |
Mechanical properties
| Property | 40CrMnMo7 | 40CrMnNiMo8-6-4 | Unit |
|---|---|---|---|
| tensile_strength | 900–1050 | 900–1100 | MPa |
| yield_strength | 700–800 | — | MPa |
| hardness_hrc | 28–32 | — | HRC |
Compatibility Assessment
40CrMnMo7 and 40CrMnNiMo8-6-4 have very similar compositions (100% overlap) and are likely interchangeable for most applications. Verify mechanical properties for your specific use case.
Automated assessment based on composition analysis
Frequently Asked Questions
Is 40CrMnMo7 the same as 40CrMnNiMo8-6-4?
40CrMnMo7 and 40CrMnNiMo8-6-4 have a 100% composition overlap. For most purposes, they can be considered similar.
Can I replace 40CrMnMo7 with 40CrMnNiMo8-6-4?
In many cases, yes. The compositions overlap significantly (100%). However, always verify mechanical property requirements and heat treatment compatibility for your specific application.
What is the difference between 40CrMnMo7 and 40CrMnNiMo8-6-4?
The main differences are in the following elements: overall alloying content. 40CrMnMo7 is a Tool Steel grade, while 40CrMnNiMo8-6-4 is a Tool Steel grade.
View full data for each material:
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.