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R30012 Cobalt vs. ASTM A228 Music Wire

R30012 cobalt belongs to the cobalt alloys classification, while ASTM A228 music wire belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30012 cobalt and the bottom bar is ASTM A228 music wire.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
12
Fatigue Strength, MPa 320
1280
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 86
72
Tensile Strength: Ultimate (UTS), MPa 830
2450
Tensile Strength: Yield (Proof), MPa 650
2050

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1470
1450
Melting Onset (Solidus), °C 1280
1410
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 15
49
Thermal Expansion, µm/m-K 12
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.2

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.8
Embodied Carbon, kg CO2/kg material 8.3
1.4
Embodied Energy, MJ/kg 120
19
Embodied Water, L/kg 480
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
280
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26
87
Strength to Weight: Bending, points 22
52
Thermal Diffusivity, mm2/s 3.8
13
Thermal Shock Resistance, points 23
79

Alloy Composition

Carbon (C), % 1.4 to 2.0
0.7 to 1.0
Chromium (Cr), % 27 to 32
0
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
98 to 99
Manganese (Mn), % 0
0.2 to 0.6
Molybdenum (Mo), % 0 to 1.0
0
Nickel (Ni), % 0 to 3.0
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 2.0
0.1 to 0.3
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 7.5 to 9.5
0