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R31537 Cobalt vs. SAE-AISI D7 Steel

R31537 cobalt belongs to the cobalt alloys classification, while SAE-AISI D7 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 R31537 cobalt and the bottom bar is SAE-AISI D7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 87
73
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
800 to 2120

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1360
1440
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 13
27
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.6
Embodied Carbon, kg CO2/kg material 8.1
11
Embodied Energy, MJ/kg 110
180
Embodied Water, L/kg 530
130

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
29 to 78
Strength to Weight: Bending, points 26 to 32
25 to 48
Thermal Diffusivity, mm2/s 3.4
7.4
Thermal Shock Resistance, points 24 to 32
27 to 72

Alloy Composition

Carbon (C), % 0 to 0.14
2.2 to 2.5
Chromium (Cr), % 26 to 30
11.5 to 13.5
Cobalt (Co), % 58.9 to 69
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
76.6 to 81.9
Manganese (Mn), % 0 to 1.0
0 to 0.6
Molybdenum (Mo), % 5.0 to 7.0
0.7 to 1.2
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 0.6
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
3.8 to 4.4

Comparable Variants