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R31538 Cobalt vs. SAE-AISI T5 Steel

R31538 cobalt belongs to the cobalt alloys classification, while SAE-AISI T5 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 T5 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
860 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1360
1810
Melting Onset (Solidus), °C 1290
1750
Specific Heat Capacity, J/kg-K 450
410
Thermal Conductivity, W/m-K 13
21
Thermal Expansion, µm/m-K 13
11

Otherwise Unclassified Properties

Density, g/cm3 8.4
9.4
Embodied Carbon, kg CO2/kg material 8.1
11
Embodied Energy, MJ/kg 110
170
Embodied Water, L/kg 530
140

Common Calculations

Stiffness to Weight: Axial, points 15
12
Stiffness to Weight: Bending, points 24
21
Strength to Weight: Axial, points 34 to 45
25 to 63
Strength to Weight: Bending, points 27 to 32
21 to 39
Thermal Diffusivity, mm2/s 3.5
5.5
Thermal Shock Resistance, points 25 to 33
26 to 66

Alloy Composition

Carbon (C), % 0.15 to 0.35
0.75 to 0.85
Chromium (Cr), % 26 to 30
3.8 to 5.0
Cobalt (Co), % 58.7 to 68.9
7.0 to 9.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
60.6 to 68.3
Manganese (Mn), % 0 to 1.0
0.2 to 0.4
Molybdenum (Mo), % 5.0 to 7.0
0.5 to 1.3
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 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
17.5 to 19
Vanadium (V), % 0
1.8 to 2.4

Comparable Variants