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R31537 Cobalt vs. SAE-AISI M4 Steel

R31537 cobalt belongs to the cobalt alloys classification, while SAE-AISI M4 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 M4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 87
76
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
770 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 320
260
Melting Completion (Liquidus), °C 1360
1610
Melting Onset (Solidus), °C 1290
1560
Specific Heat Capacity, J/kg-K 450
440
Thermal Conductivity, W/m-K 13
25
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.3
Embodied Carbon, kg CO2/kg material 8.1
14
Embodied Energy, MJ/kg 110
210
Embodied Water, L/kg 530
110

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 33 to 44
26 to 72
Strength to Weight: Bending, points 26 to 32
23 to 45
Thermal Diffusivity, mm2/s 3.4
6.9
Thermal Shock Resistance, points 24 to 32
24 to 68

Alloy Composition

Carbon (C), % 0 to 0.14
1.3 to 1.4
Chromium (Cr), % 26 to 30
3.8 to 4.8
Cobalt (Co), % 58.9 to 69
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
75.9 to 81.4
Manganese (Mn), % 0 to 1.0
0.15 to 0.4
Molybdenum (Mo), % 5.0 to 7.0
4.3 to 5.5
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
0.2 to 0.45
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
5.3 to 6.5
Vanadium (V), % 0
3.8 to 4.5

Comparable Variants