CoCrMo (cobalt-chromium-molybdenum) cast alloy per ASTM F75 is a cobalt-based superalloy designed for extreme corrosion resistance and biocompatibility, with chromium and molybdenum additions providing oxidation resistance and solid-solution strengthening. This material is the workhorse for load-bearing orthopedic implants and dental prosthetics where long-term implantation demands both mechanical reliability and absence of toxic leaching. Engineers select cast CoCrMo over alternatives (stainless steel, titanium alloys) primarily for superior corrosion resistance in physiological environments and proven decades-long clinical track record, though its lower machinability and higher density compared to Ti alloys make it less preferred for weight-critical aerospace applications.
Compliance & Regulations
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Elongation at Break(εf) | 8.000 | - | — | ||
Fatigue Strength (10⁷ cycles)(σf) | 240.0 | MPa | notes | ||
Fracture Toughness(KIC) | 60,000,000 | Pa·√m | — | ||
Hardness (Vickers)(HV) | 300 | HV | — | ||
Poisson's Ratio(ν) | 0.2900 | - | — | ||
Ultimate Tensile Strength(σUTS) | 655.0 | MPa | ASTM F75 | ||
Yield Strength (0.2% offset)(σy) | 450.0 | MPa | ASTM F75 | ||
Young's Modulus(E) | 210.0 | GPa | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Melting Point / Solidus(Tm) | 1,623.2 – 1,723.2 | K | — | ||
Specific Heat Capacity(Cp) | 452 | J/(kg·K) | — | ||
Thermal Conductivity(k) | 14.80 | W/(m·K) | — |
| Property | Value | Unit | Conditions | Source | |
|---|---|---|---|---|---|
Density(ρ) | 8.300 | kg/m³ | — |