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SAE-AISI T15 Steel vs. R31233 Cobalt

SAE-AISI T15 steel belongs to the iron alloys classification, while R31233 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI T15 steel and the bottom bar is R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 76
85
Tensile Strength: Ultimate (UTS), MPa 830 to 2240
1020

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1690
1350
Melting Onset (Solidus), °C 1640
1330
Specific Heat Capacity, J/kg-K 430
440
Thermal Conductivity, W/m-K 21
12
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 8.7
8.6
Embodied Carbon, kg CO2/kg material 16
8.4
Embodied Energy, MJ/kg 250
110
Embodied Water, L/kg 140
480

Common Calculations

Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
23
Strength to Weight: Axial, points 26 to 71
33
Strength to Weight: Bending, points 22 to 43
26
Thermal Diffusivity, mm2/s 5.6
3.2
Thermal Shock Resistance, points 26 to 70
25

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 1.5 to 1.6
0.020 to 0.1
Chromium (Cr), % 3.8 to 5.0
23.5 to 27.5
Cobalt (Co), % 4.8 to 5.3
44.7 to 63.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 67.5 to 73.5
1.0 to 5.0
Manganese (Mn), % 0.15 to 0.4
0.1 to 1.5
Molybdenum (Mo), % 0 to 1.0
4.0 to 6.0
Nickel (Ni), % 0 to 0.3
7.0 to 11
Nitrogen (N), % 0
0.030 to 0.12
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0.15 to 0.4
0.050 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.020
Tungsten (W), % 11.8 to 13
1.0 to 3.0
Vanadium (V), % 4.5 to 5.3
0