ASTM F688 specifies wrought cobalt-35nickel-20chromium-10molybdenum alloy (UNS R30035) in plate, sheet, and foil for surgical implants. This cobalt-based superalloy offers ultra-high strength, outstanding corrosion resistance, and excellent biocompatibility for orthopedic implants, dental prosthetics, and surgical instruments .
1. Product Specifications & Physical DataUNS R30035 is available in plate, sheet, and foil to support the fabrication of precision implant components. The alloy is supplied in three primary conditions: annealed (for formability), cold-worked (for increased strength), and cold-worked plus aged (for maximum strength). Available Forms: Plate, sheet, foil, bar, wire, and custom components . Specifications: ASTM F688 (plate/sheet/foil), ASTM F562 (bar/wire), ISO 5832-6, UNS R30035, AMS 5844/5845 .
| Chemical Composition (Weight %) | UNS R30035 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. |
| Physical Properties | Metric | Imperial |
|---|
| Density | 8.43 g/cm³ | 0.304 lb/in³ | | Melting Range | 1440°C | 2625°F | | Modulus of Elasticity | 230 - 234 GPa | 33.4 - 34.0 × 10⁶ psi | | Electrical Resistivity | 0.86 µΩ·m | 0.86 µΩ·m | | Magnetic Permeability | < 1.01 | < 1.01 |
| Mechanical Properties (Condition-Specific) | Value | Unit |
|---|
| Annealed | | | | Tensile Strength (min.) | 896 MPa | 130 ksi | | Yield Strength (0.2% offset, min.) | 414 MPa | 60 ksi | | Elongation (min.) | 45% | 45% | | Cold-Worked | | | | Tensile Strength (min.) | 1310 MPa | 190 ksi | | Yield Strength (min.) | 965 MPa | 140 ksi | | Elongation (min.) | 12% | 12% | | Cold-Worked + Aged | | | | Tensile Strength (min.) | 1790 MPa | 260 ksi | | Yield Strength (min.) | 1380 MPa | 200 ksi | | Elongation (min.) | 8% | 8% | | Hardness (Aged) | 38 - 48 HRC | 38 - 48 HRC |
2. Operating Conditions & Selection CriteriaBiocompatibility: ASTM F688 / ISO 5832-6 approved for surgical implants Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking in body fluids Strengthening Mechanism: Cold work + aging achieves ultra-high tensile strength (260 ksi) Surface Finishes: Ground, cold-rolled, polished (mirror, high luster), dull satin Edge Conditions: Rolled, square, slit, or sheared edges available
3. Fabrication & Material ComparisonAnnealed: Soft for formability Cold-Worked: Strengthened through mechanical deformation Aging: 650-700°C × 4-8 hours for maximum strength Machining: Requires rigid setups, sharp tools, ample coolant
| Material Comparison | UNS R30035 | ASTM F75 (CoCrMo) | ASTM F136 (Ti-6Al-4V) | ASTM F138 (316L) |
|---|
| Tensile Strength (min.) | 260 ksi (aged) | 95 ksi | 125 ksi | 80 ksi | | Modulus of Elasticity | 230 GPa | 210 GPa | 110 GPa | 193 GPa | | Corrosion Resistance | Excellent | Excellent | Excellent | Good | | Wear Resistance | Excellent | Excellent | Good | Fair | | MRI Compatibility | Good | Moderate | Excellent | Good | | Typical Applications | High-strength implants, cardiovascular stents, surgical instruments | Joint replacements, femoral heads | Orthopedic implants, spinal devices | Temporary implants, instruments |
4. ApplicationsOrthopedic Implants: Hip stems, knee components, bone plates, screws, and spinal fixation devices Dental Prosthetics: Crowns, bridges, implant abutments, and orthodontic components Cardiovascular: Stents, heart valve frames, vena cava filters, and pacemaker leads Surgical Instruments: Forceps, retractors, scissors, and cutting tools requiring high strength and corrosion resistance Cranial & Maxillofacial: Plates, mesh, and screws for facial reconstruction
Contact ZYTC Alloy for certified ASTM F688 UNS R30035 plate, sheet, and foil with complete traceability, material test reports, and competitive pricing. Available in annealed, cold-worked, and aged conditions with custom surface finishes to meet your surgical implant requirements. Email: daisy@zytcsteel.com WhatsApp/WeChat: +86 17335753350 |
