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R31538 Cobalt vs. SAE-AISI M48 Steel

R31538 cobalt belongs to the cobalt alloys classification, while SAE-AISI M48 steel belongs to the iron alloys. There are 18 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is SAE-AISI M48 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 86
78
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
890 to 2390

Thermal Properties

Latent Heat of Fusion, J/g 320
260
Melting Completion (Liquidus), °C 1360
1670
Melting Onset (Solidus), °C 1290
1620
Specific Heat Capacity, J/kg-K 450
420
Thermal Expansion, µm/m-K 13
12

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.7
Embodied Carbon, kg CO2/kg material 8.1
13
Embodied Energy, MJ/kg 110
190
Embodied Water, L/kg 530
160

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
22
Strength to Weight: Axial, points 34 to 45
28 to 76
Strength to Weight: Bending, points 27 to 32
23 to 45
Thermal Shock Resistance, points 25 to 33
26 to 71

Alloy Composition

Carbon (C), % 0.15 to 0.35
1.4 to 1.5
Chromium (Cr), % 26 to 30
3.5 to 4.0
Cobalt (Co), % 58.7 to 68.9
8.0 to 10
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
63.8 to 69.8
Manganese (Mn), % 0 to 1.0
0.15 to 0.4
Molybdenum (Mo), % 5.0 to 7.0
4.8 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
0.15 to 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
9.5 to 10.5
Vanadium (V), % 0
2.8 to 3.3

Comparable Variants