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SAE-AISI T5 Steel vs. R31538 Cobalt

SAE-AISI T5 steel belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt 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 SAE-AISI T5 steel and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

Carbon (C), % 0.75 to 0.85
0.15 to 0.35
Chromium (Cr), % 3.8 to 5.0
26 to 30
Cobalt (Co), % 7.0 to 9.5
58.7 to 68.9
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 60.6 to 68.3
0 to 0.75
Manganese (Mn), % 0.2 to 0.4
0 to 1.0
Molybdenum (Mo), % 0.5 to 1.3
5.0 to 7.0
Nickel (Ni), % 0 to 0.3
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 17.5 to 19
0
Vanadium (V), % 1.8 to 2.4
0

Comparable Variants