UNS R30035
UNS R30035
Model No: UNS R30035 Cobalt Chrome Alloy

ASTM F688 / UNS R30035 / Cobalt Chrome Alloy

ASTM F688 outlines the requirements for wrought cobalt-35 nickel-20 chromium-10 molybdenum alloy (UNS R30035) in the form of plates, sheets, and foils intended for surgical implants.
Delivery :
FOB
minimum order :
100 kilograms
Supply Ability :
5000Tonkilograms / Month
Stock Time :
7-10Day
Country of Origin :
CHINA
Quantity :
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Cobalt-chromium (Co-Cr) alloys are widely used in the medical industry due to their excellent mechanical properties, corrosion resistance, and biocompatibility. Among the various specifications governing these materials, ASTM F688 outlines the requirements for wrought cobalt-35 nickel-20 chromium-10 molybdenum alloy (UNS R30035) in the form of plates, sheets, and foils intended for surgical implants.

Chemical Composition

ElementContent (%)
Cobalt, Co35
Nickel, Ni35
Chromium, Cr20
Molybdenum, Mo9.80
Carbon, C0.013

Physical Properties

PropertiesMetricImperial
Density8.41 g/cm30.304 lb/in3
Melting point1416°C2580°F

Mechanical Properties

PropertiesMetricImperial
Tensile strength897 MPa130000 psi
Yield strength (@strain 0.200 %)517 MPa75000 psi
Elongation at break30%30%
Reduction of area35%35%
Hardness, Brinell (estimated from Rockwell C value for Brinell test with 3000 kg load/10 mm diameter ball)278278
Hardness, Knoop (estimated from Rockwell C value)301301
Hardness, Rockwell C2828
Hardness, Vickers (estimated from Rockwell C value)292292
 

The alloy is manufactured in three primary conditions

  • Annealed – Softened for improved formability.
  • Cold-Worked – Strengthened through mechanical deformation.
  • Cold-Worked and Capability-Aged – Further heat-treated to enhance mechanical properties.

Surface Finishes and Edge Conditions

ASTM F688 allows for various surface finishes to meet different surgical and implant requirements:

Plates

  • Ground Finish – Smooth, precise surface.
  • Dull Finish – Non-reflective, matte surface.
  • Edge Types: Rolled edge or approximate square edge.

Sheets and Foils

  • Dull Cold-Rolled – Non-reflective, uniform surface.
  • Bright Cold-Rolled – Smooth, slightly reflective.
  • Polished Finishes (Intermediate, General-Purpose, High Luster, Mirror) – For applications requiring smooth, highly refined surfaces.
  • Dull Satin Finish – Aesthetic, low-glare surface.
  • Edge Types: Approximate square edge, slit edge, or sheared edge.
 

Mechanical Testing

  • Ultimate Tensile Strength (UTS) – Measures maximum stress before failure.
  • Yield Strength – Determines stress at which permanent deformation begins.
  • Elongation – Evaluates ductility.
  • Hardness – Assesses resistance to deformation.
  • Average Grain Size – Influences mechanical properties and fatigue resistance.

Applications in Medical Implants

Due to its biocompatibility, high strength, and corrosion resistance, UNS R30035 is commonly used in:
  • Orthopedic Implants (Hip and knee replacements)
  • Dental Prosthetics (Crowns, bridges, and implants)
  • Cardiovascular Stents
  • Surgical Instruments
 

Lork Group – Your Trusted Manufacturer of ASTM F688 Cobalt-Chromium Alloy

Lork Group specializes in the production of high-quality ASTM F688-compliant cobalt-chromium-molybdenum alloy (UNS R30035) for surgical implants, including plates, sheets, and foils. Our materials meet stringent medical-grade standards, ensuring exceptional strength, corrosion resistance, and biocompatibility for orthopedic, dental, and cardiovascular applications.

We offer multiple processing options:

  • Conditions: Annealed, cold-worked, or cold-worked + aged
  • Surface Finishes: Ground, polished, mirror, or custom finishes
  • Precision Thickness: From ultra-thin foils (0.05mm) to thick plates (20mm)
With strict quality control (chemical composition, mechanical testing, and grain size analysis), Lork Group guarantees material consistency and performance. Fast lead times and technical support available.

Request a Quote Today!

📞 Phone: +86 17335753350