CoCrMo F75 vs Stellite 6: 38% composition overlap. Significantly different materials serving different application areas.
CoCrMo F75 vs Stellite 6
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.
Stellite 6
R30006
The world's most widely used cobalt-based wear-resistant alloy. CoCrW matrix with hard chromium carbides (M7C3) provides exceptional resistance to abrasion, erosion, cavitation, galling, and corrosion across a wide temperature range. Retains hardness up to 500°C. Non-magnetic. Industry standard for general-purpose wear resistance — suitable for hardfacing (PTA, laser, TIG), casting, and powder metallurgy. Used for valve seats, pump sleeves, bearing surfaces, cutting tools, hot-forming dies, and turbine blade erosion shields.
| CoCrMo F75 | Stellite 6 | |
|---|---|---|
| Material Number | R30075 | R30006 |
| Category | cobalt | cobalt |
| Standard | ASTM F75 | AMS 5894 |
Chemical composition (wt%)
| Element | CoCrMo F75 | Stellite 6 | Overlap |
|---|---|---|---|
| C | ≤ 0.35% | 0.9–1.4% | No overlap |
| Si | ≤ 1% | ≤ 1.5% | OK |
| Mn | ≤ 1% | ≤ 1% | OK |
| Cr | 27–30% | 26–32% | OK |
Mechanical properties
| Property | CoCrMo F75 | Stellite 6 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 655 | ≥ 896 | MPa |
| yield_strength | ≥ 450 | — | MPa |
| elongation | ≥ 8 | — | % |
Compatibility Assessment
CoCrMo F75 and Stellite 6 have significantly different compositions (38% 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 Stellite 6?
CoCrMo F75 and Stellite 6 have a 38% composition overlap. They are generally not directly interchangeable.
Can I replace CoCrMo F75 with Stellite 6?
Generally not recommended. The compositions differ significantly (38% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between CoCrMo F75 and Stellite 6?
The main differences are in the following elements: C, Mo, W. CoCrMo F75 is a cobalt grade, while Stellite 6 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.