CoCrMo F75 vs MP35N / Alloy 35N: 14% composition overlap. Significantly different materials serving different application areas.
CoCrMo F75 vs MP35N / Alloy 35N
Side-by-side chemical composition and mechanical property comparison.
Overview
CoCrMo F75
R30075
Cobalt-28Chromium-6Molybdenum investment casting alloy for surgical implants. The standard material for orthopedic hip and knee joint replacements since the 1970s. Excellent biocompatibility, wear resistance (metal-on-metal bearings), and corrosion resistance from passive Cr oxide layer. Also used in dental prosthetics (crowns, bridges, denture frameworks). Typically produced by lost-wax (investment) casting, often followed by HIP to eliminate porosity. ISO designation: ISO 5832-4.
MP35N / Alloy 35N
2.4999
Cobalt-nickel-chromium-molybdenum alloy (35Co-35Ni-20Cr-10Mo) with ultrahigh strength achievable by cold work + aging. Annealed: Rm ~860 MPa, Rp0.2 ~380 MPa. Cold worked + aged: Rm up to 1900 MPa, Rp0.2 up to 1725 MPa. Non-magnetic, excellent corrosion resistance (comparable to Hastelloy C), biocompatible. Density 8.43 g/cm³. UNS R30035, AMS 5758/5844. Applications: medical implants (cardiac pacing leads, orthopedic devices), aerospace fasteners, subsea connectors, springs, dental wire.
| CoCrMo F75 | MP35N / Alloy 35N | |
|---|---|---|
| Material Number | R30075 | 2.4999 |
| Category | cobalt | cobalt |
| Standard | ASTM F75 | AMS 5758 / ASTM F562 |
Chemical composition (wt%)
| Element | CoCrMo F75 | MP35N / Alloy 35N | Overlap |
|---|---|---|---|
| C | ≤ 0.35% | ≤ 0.025% | OK |
| Si | ≤ 1% | ≤ 0.15% | OK |
| Mn | ≤ 1% | ≤ 0.15% | OK |
| Cr | 27–30% | 19–21% | No overlap |
Mechanical properties
| Property | CoCrMo F75 | MP35N / Alloy 35N | Unit |
|---|---|---|---|
| tensile_strength | ≥ 655 | ≥ 860 | MPa |
| yield_strength | ≥ 450 | ≥ 380 | MPa |
| elongation | ≥ 8 | ≥ 50 | % |
Compatibility Assessment
CoCrMo F75 and MP35N / Alloy 35N have significantly different compositions (14% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is CoCrMo F75 the same as MP35N / Alloy 35N?
CoCrMo F75 and MP35N / Alloy 35N have a 14% composition overlap. They are generally not directly interchangeable.
Can I replace CoCrMo F75 with MP35N / Alloy 35N?
Generally not recommended. The compositions differ significantly (14% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between CoCrMo F75 and MP35N / Alloy 35N?
The main differences are in the following elements: Cr, Mo, Ni. CoCrMo F75 is a cobalt grade, while MP35N / Alloy 35N is a cobalt 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.