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R30016 Cobalt vs. ASTM A227 Spring Steel

R30016 cobalt belongs to the cobalt alloys classification, while ASTM A227 spring steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30016 cobalt and the bottom bar is ASTM A227 spring steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 8.4
12
Fatigue Strength, MPa 290
900 to 1160
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 85
72
Tensile Strength: Ultimate (UTS), MPa 1010
1720 to 2220
Tensile Strength: Yield (Proof), MPa 580
1430 to 1850

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1270
1410
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
52
Thermal Expansion, µm/m-K 14
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
8.3

Otherwise Unclassified Properties

Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 7.7
1.4
Embodied Energy, MJ/kg 110
19
Embodied Water, L/kg 500
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 72
200 to 260
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 33
61 to 79
Strength to Weight: Bending, points 26
41 to 48
Thermal Diffusivity, mm2/s 3.9
14
Thermal Shock Resistance, points 24
55 to 71

Alloy Composition

Carbon (C), % 0.9 to 1.4
0.45 to 0.85
Chromium (Cr), % 28 to 32
0
Cobalt (Co), % 49.6 to 66.9
0
Iron (Fe), % 0 to 3.0
97.4 to 99.1
Manganese (Mn), % 0.5 to 2.0
0.3 to 1.3
Molybdenum (Mo), % 0 to 1.5
0
Nickel (Ni), % 0 to 3.0
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.2 to 2.0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.050
Tungsten (W), % 3.5 to 5.5
0