UNS R30075 is a cobalt-chromium-molybdenum alloy defined by ASTM F75, specifically formulated for biomedical applications requiring exceptional wear resistance, biocompatibility, and corrosion protection. With a nominal composition of 60-65% cobalt, 26-30% chromium, and 5-7% molybdenum, this alloy delivers high hardness (40-50 HRC), excellent mechanical strength, and long-term durability in physiological environments. It is the standard material for orthopedic implants including hip and knee replacements, dental prosthetics, and surgical instruments .
1. Product Specifications & Physical DataZYTC Alloy supplies ASTM F75 CoCrMo in comprehensive forms for medical, aerospace, and industrial applications requiring verified biocompatibility and wear properties. Available Forms: Bar, ingot, ribbon, wire, pipe, sheet, foil, and custom castings . Specifications: ASTM F75 (castings), ISO 5832-4 (implantable alloys), UNS R30075 .
| Chemical Composition (Weight %) | ASTM F75 Specification |
|---|
| Cobalt (Co) | 60.0 - 65.0 | | Chromium (Cr) | 26.0 - 30.0 | | Molybdenum (Mo) | 5.0 - 7.0 | | Nickel (Ni) | 1.0 max. | | Iron (Fe) | 0.75 max. | | Carbon (C) | 0.35 max. | | Silicon (Si) | 1.0 max. | | Manganese (Mn) | 1.0 max. | | Nitrogen (N) | 0.25 max. |
| Physical Properties | Metric | Imperial |
|---|
| Density | 8.3 g/cm³ | 0.300 lb/in³ | | Melting Point | ~1380°C | 2516°F | | Hardness | 40 - 50 HRC | 370 - 490 HV | | Thermal Conductivity | 14 - 18 W/m·K | 97 - 125 BTU·in/hr·ft²·°F |
| Mechanical Properties | Metric | Imperial |
|---|
| Tensile Strength | 655 - 895 MPa | 95 - 130 ksi | | Yield Strength | 450 - 585 MPa | 65 - 85 ksi | | Elongation | 8 - 20% | 8 - 20% | | Reduction of Area | 8 - 20% | 8 - 20% |
2. Operating Conditions & Selection CriteriaASTM F75 CoCrMo is specified when designers require a proven, biocompatible alloy with excellent wear resistance for load-bearing medical implants and industrial wear components. Service Environment: Optimized for long-term implantation in physiological environments; excellent resistance to corrosion in body fluids . Wear Resistance: High hardness combined with carbide precipitates provides exceptional resistance to wear in articulating joint surfaces . Biocompatibility: Approved per ISO 5832-4 for surgical implants; excellent tissue compatibility and resistance to corrosion fatigue . Microstructure: Homogeneous matrix with carbide precipitates optimized through investment casting and heat treatment . Rapid Manufacturing: Suitable for production tools with conformal cooling channels; can be polished to optical or mirror-like finishes .
3. Fabrication & Material ComparisonCasting: Typically investment cast to near-net shape; produces components with excellent surface finish and dimensional accuracy . Heat Treatment: Solution annealing and aging optimize carbide distribution and mechanical properties . Polishing: Can be polished to mirror finish due to inclusionary cleanliness; essential for bearing surfaces . Machining: Difficult in as-cast condition; typically finished by grinding with diamond or silicon carbide wheels . Material Comparison: vs. Stellite 21: Similar cobalt-chromium base; F75 optimized specifically for medical castings with tighter composition control . vs. Ti-6Al-4V: Higher hardness and wear resistance; higher modulus preferred for load-bearing implants . vs. 316L Stainless: Superior wear resistance and biocompatibility; standard for high-wear orthopedic applications . vs. MP35N: F75 optimized for castings; MP35N for wrought high-strength applications .
4. ApplicationsOrthopedic Implants: Hip stems, femoral heads, acetabular cups, knee replacements, shoulder joints Dental: Crowns, bridges, denture frameworks, partial dentures Surgical Instruments: Forceps, retractors, cutting tools requiring corrosion resistance Industrial: Injection molding tools, wear components, valve parts Aerospace: Bearing surfaces, wear-resistant components
Contact ZYTC Alloy for certified ASTM F75 CoCrMo materials with complete traceability, technical datasheets, and competitive pricing on standard sizes or custom-cast components. Email: daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
