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R31538 Cobalt vs. SAE-AISI A7 Steel

R31538 cobalt belongs to the cobalt alloys classification, while SAE-AISI A7 steel belongs to the iron alloys. There are 20 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is SAE-AISI A7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
72
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
800 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 320
260
Melting Completion (Liquidus), °C 1360
1470
Melting Onset (Solidus), °C 1290
1430
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
37
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.1
13
Embodied Energy, MJ/kg 110
200
Embodied Water, L/kg 530
100

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
29 to 77
Strength to Weight: Bending, points 27 to 32
25 to 48
Thermal Diffusivity, mm2/s 3.5
10
Thermal Shock Resistance, points 25 to 33
27 to 72

Alloy Composition

Carbon (C), % 0.15 to 0.35
2.0 to 2.9
Chromium (Cr), % 26 to 30
5.0 to 5.8
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
81.4 to 87.7
Manganese (Mn), % 0 to 1.0
0 to 0.8
Molybdenum (Mo), % 5.0 to 7.0
0.9 to 1.4
Nickel (Ni), % 0 to 1.0
0 to 0.3
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
0.5 to 1.5
Vanadium (V), % 0
3.9 to 5.2

Comparable Variants