CoCrMo F75 vs Haynes 188 / Alloy 188: 20% composition overlap. Significantly different materials serving different application areas.
CoCrMo F75 vs Haynes 188 / Alloy 188
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.
Haynes 188 / Alloy 188
2.4683
Cobalt-nickel-chromium-tungsten superalloy with lanthanum addition for oxidation resistance. Solid-solution strengthened. Bright annealed: Rm ~946 MPa, Rp0.2 ~464 MPa, A ~53%. At 980°C: Rm ~243 MPa, Rp0.2 ~131 MPa. Density 8.98 g/cm³. Excellent oxidation and sulfidation resistance to 1095°C. Good resistance to molten chloride salts and sulfate hot corrosion. UNS R30188, AMS 5608 (sheet), AMS 5772 (bar). Applications: gas turbine combustors, transition ducts, flame holders, afterburner liners, industrial furnace components.
| CoCrMo F75 | Haynes 188 / Alloy 188 | |
|---|---|---|
| Material Number | R30075 | 2.4683 |
| Category | cobalt | cobalt |
| Standard | ASTM F75 | AMS 5608 / AMS 5772 |
Chemical composition (wt%)
| Element | CoCrMo F75 | Haynes 188 / Alloy 188 | Overlap |
|---|---|---|---|
| C | ≤ 0.35% | 0.05–0.15% | OK |
| Si | ≤ 1% | 0.2–0.5% | OK |
| Mn | ≤ 1% | ≤ 1.25% | OK |
| Cr | 27–30% | 20–24% | No overlap |
Mechanical properties
| Property | CoCrMo F75 | Haynes 188 / Alloy 188 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 655 | ≥ 946 | MPa |
| yield_strength | ≥ 450 | ≥ 464 | MPa |
| elongation | ≥ 8 | ≥ 53 | % |
Compatibility Assessment
CoCrMo F75 and Haynes 188 / Alloy 188 have significantly different compositions (20% 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 Haynes 188 / Alloy 188?
CoCrMo F75 and Haynes 188 / Alloy 188 have a 20% composition overlap. They are generally not directly interchangeable.
Can I replace CoCrMo F75 with Haynes 188 / Alloy 188?
Generally not recommended. The compositions differ significantly (20% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between CoCrMo F75 and Haynes 188 / Alloy 188?
The main differences are in the following elements: Cr, Ni, W. CoCrMo F75 is a cobalt grade, while Haynes 188 / Alloy 188 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.