ASTM F90 UNS R30605 Surgical Implant Filaments

UNS R30605 cobalt-chromium-tungsten-nickel alloy per ASTM F90 for surgical implants. Features high strength, excellent corrosion and wear resistance, and MRI compatibility. Used in cardiovascular stents, guidewires, orthopedic wires, and surgical filaments.

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ASTM F90 specifies wrought cobalt-20chromium-15tungsten-10nickel alloy (UNS R30605) for surgical implant applications. This cobalt-based superalloid offers high strength, outstanding corrosion resistance, excellent wear resistance, and good biocompatibility, making it ideal for cardiovascular stents, surgical filaments, orthopedic wires, and implantable devices .

1. Product Specifications & Physical Data

Available Forms: Wire, filament, bar, sheet, strip .
Specifications: ASTM F90, ISO 5832-5, UNS R30605 .

Chemical Composition (Weight %)	Value
Cobalt (Co)	Balance
Chromium (Cr)	19.0 - 21.0
Tungsten (W)	14.0 - 16.0
Nickel (Ni)	9.0 - 11.0
Carbon (C)	0.05 - 0.15

Physical Properties	Value
Density	9.13 g/cm³
Modulus of Elasticity	225 GPa

Mechanical Properties	Annealed	Cold-Worked
Tensile Strength (min.)	860 MPa	1200-1500 MPa
Yield Strength (min.)	380 MPa	900-1200 MPa
Elongation (min.)	30%	8-15%

2. Operating Conditions & Selection Criteria

Biocompatibility: ASTM F90 / ISO 5832-5 approved for surgical implants
Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, and stress corrosion cracking in body fluids
Strengthening Mechanism: Solid-solution strengthened by tungsten; enhanced by cold working
Wear Resistance: Excellent galling and wear resistance for moving components
MRI Compatibility: Low magnetic permeability (< 1.01)

3. Fabrication & Material Comparison

Annealing: 1177-1232°C (2150-2250°F), rapid cool
Cold Working: High work-hardening rate enables fine wire drawing
Surface Finishing: Electropolishing recommended for implant surfaces

Material Comparison	UNS R30605	UNS R30035	Ti-6Al-4V
Tensile Strength	125 ksi	260 ksi	125 ksi
Modulus	225 GPa	230 GPa	110 GPa
Wear Resistance	Excellent	Excellent	Good
MRI Compatibility	Excellent	Good	Excellent

4. Applications

Cardiovascular stents, guidewires, embolization coils
Fracture fixation wires, surgical filaments, suture anchors
Orthodontic wires, spinal rods, neurovascular devices

Contact ZYTC Alloy for certified ASTM F90 UNS R30605 surgical filaments with EN 10204 3.1/3.2 certificates, full traceability, and competitive pricing. Available in wire, bar, sheet, and strip.

Email: daisy@zytcsteel.com

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