UNS R30003 (ASTM F1058 Grade 1) Alloy
R30003 cobalt is a cobalt alloy. ASTM F1058 Grade 1 is the ASTM designation for this material. R30003 is the UNS number. It has a fairly high melting temperature among the cobalt alloys in the database.
The properties of R30003 cobalt include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare R30003 cobalt to other cobalt alloys (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
210 GPa 31 x 106 psi
Elongation at Break
10 to 73 %
Fatigue Strength
320 to 560 MPa 46 to 81 x 103 psi
Poisson's Ratio
0.29
Shear Modulus
83 GPa 12 x 106 psi
Tensile Strength: Ultimate (UTS)
970 to 1720 MPa 140 to 250 x 103 psi
Tensile Strength: Yield (Proof)
510 to 1090 MPa 74 to 160 x 103 psi
Thermal Properties
Latent Heat of Fusion
310 J/g
Melting Completion (Liquidus)
1400 °C 2560 °F
Melting Onset (Solidus)
1440 °C 2620 °F
Specific Heat Capacity
450 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
13 W/m-K 7.2 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
2.1 % IACS
Otherwise Unclassified Properties
Base Metal Price
95 % relative
Density
8.4 g/cm3 520 lb/ft3
Embodied Carbon
8.0 kg CO2/kg material
Embodied Energy
110 MJ/kg 45 x 103 BTU/lb
Embodied Water
400 L/kg 48 gal/lb
Common Calculations
Resilience: Unit (Modulus of Resilience)
600 to 2790 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
32 to 57 points
Strength to Weight: Bending
26 to 38 points
Thermal Diffusivity
3.3 mm2/s
Thermal Shock Resistance
26 to 45 points
Alloy Composition
| Co | 39 to 41 | |
| Cr | 19 to 21 | |
| Fe | 10 to 20.5 | |
| Ni | 14 to 16 | |
| Mo | 6.0 to 8.0 | |
| Mn | 1.5 to 2.5 | |
| Si | 0 to 1.2 | |
| C | 0 to 0.15 | |
| B | 0 to 0.1 | |
| P | 0 to 0.015 | |
| S | 0 to 0.015 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM F1058: Standard Specification for Wrought 40Cobalt-20Chromium-16Iron-15Nickel-7Molybdenum Alloy Wire and Strip for Surgical Implant Applications (UNS R30003 and UNS R30008)
ISO 5832-7: Implants for Surgery - Metallic Materials - Part 7: Forgeable and Cold-Formed Cobalt-Chromium-Nickel-Molybdenum-Iron Alloy
ASM Specialty Handbook: Nickel, Cobalt, and Their Alloys, Joseph R. Davis (editor), 2000