2.4782 (MP35N) is a vacuum induction melted and vacuum arc remelted (VIM/VAR) cobalt-nickel-chromium-molybdenum alloy that achieves ultra-high strength through a two-stage cold working and aging process. With UNS R30035 designation and compliance to ASTM F562 and ISO 5832-6, this alloy delivers exceptional tensile strength (up to 260 ksi), outstanding corrosion resistance, and superior fatigue life. It is the preferred material for orthopedic implants, surgical instruments, and critical aerospace components requiring high reliability .
1. Product Specifications & Physical DataZYTC Alloy supplies MP35N (2.4782) in precision forms for medical implant and aerospace applications requiring verified mechanical properties and complete material traceability. Available Forms: Wire and round bar (0.600mm - 35.00mm diameter) . Specifications: ASTM F562, ISO 5832-6, AMS 5758, AMS 5844, AMS 5845, UNS R30035 .
| Chemical Composition (Weight %) | MP35N Specification |
|---|
| Cobalt (Co) | Balance | | Nickel (Ni) | 33.0 - 37.0 | | Chromium (Cr) | 19.0 - 21.0 | | Molybdenum (Mo) | 9.0 - 10.5 | | Iron (Fe) | 1.0 max. | | Titanium (Ti) | 1.0 max. | | Manganese (Mn) | 0.15 max. | | Silicon (Si) | 0.15 max. | | Carbon (C) | 0.025 max. | | Phosphorus (P) | 0.015 max. | | Sulfur (S) | 0.010 max. |
| Mechanical Properties | Condition | Metric | Imperial |
|---|
| Tensile Strength (min.) | Solution Treated / Cold Worked | 1758 MPa | 255 ksi | | Yield Strength (min.) | Solution Treated / Cold Worked | 1551 MPa | 225 ksi | | Elongation (min.) | Solution Treated / Cold Worked | 12% | 12% | | Tensile Strength (min.) | Cold Worked + Aged | 1793 MPa | 260 ksi | | Yield Strength (min.) | Cold Worked + Aged | 1586 MPa | 230 ksi | | Elongation (min.) | Cold Worked + Aged | 8% | 8% | | Hardness (min.) | Cold Worked + Aged | 38 HRC | 38 HRC |
2. Operating Conditions & Selection CriteriaMP35N is specified when designers require the highest combination of strength, corrosion resistance, and fatigue life for mission-critical medical and aerospace applications. Service Environment: Optimized for long-term implantation in physiological environments; excellent resistance to corrosion and stress corrosion cracking . Strengthening Mechanism: Two-stage process—cold working (45-50% reduction) followed by aging (538°C/4h) precipitates fine phases for ultimate strength exceeding 1793 MPa . Biocompatibility: ISO 5832-6 approved for surgical implants; excellent tissue compatibility and corrosion resistance . Fatigue Performance: Superior high-cycle fatigue life essential for orthopedic implants and aerospace components . VIM/VAR Processing: Double vacuum melting ensures exceptional cleanliness and homogeneity for critical applications .
3. Fabrication & Material ComparisonHeat Treatment: Strengthened via strain hardening followed by aging; supplied in solution treated, cold worked, or aged conditions per specification . Cold Working: Ductile in annealed condition; 45-50% cold reduction required for optimal age-hardening response . Machining: Difficult due to high strength and work-hardening rate; requires rigid setups, slow speeds, high feed rates, and ample coolant . Material Comparison: vs. ASTM F1537 (CoCrMo): Higher strength achievable through cold work + aging; similar biocompatibility . vs. Ti-6Al-4V (ASTM F136): Higher strength and modulus; selected for applications requiring higher load capacity . vs. 316L Stainless (ASTM F138): Significantly higher strength; superior corrosion resistance and biocompatibility . vs. ASTM F75 (Cast): Wrought structure provides superior strength and fatigue life for high-stress implants .
4. ApplicationsOrthopedic Implants: Hip stems, femoral components, knee replacements, spinal fixation hardware Surgical Instruments: Forceps, retractors, cutting tools, dental instruments Aerospace: High-strength fasteners, landing gear components, engine parts Watch Industry: High-strength cases and components Micro-engineering: Precision components requiring high strength and corrosion resistance Medical Devices: Guidewires, catheters, implantable devices
Contact ZYTC Alloy for certified MP35N (2.4782) materials with complete traceability, ASTM F562/ISO 5832-6 specifications, technical datasheets, and competitive pricing on standard bar and wire sizes. Email: daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
