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SAE-AISI T5 Steel vs. R30012 Cobalt

SAE-AISI T5 steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. 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 R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 80
86
Tensile Strength: Ultimate (UTS), MPa 860 to 2140
830

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1810
1470
Melting Onset (Solidus), °C 1750
1280
Specific Heat Capacity, J/kg-K 410
440
Thermal Conductivity, W/m-K 21
15
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 9.4
8.8
Embodied Carbon, kg CO2/kg material 11
8.3
Embodied Energy, MJ/kg 170
120
Embodied Water, L/kg 140
480

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
23
Strength to Weight: Axial, points 25 to 63
26
Strength to Weight: Bending, points 21 to 39
22
Thermal Diffusivity, mm2/s 5.5
3.8
Thermal Shock Resistance, points 26 to 66
23

Alloy Composition

Carbon (C), % 0.75 to 0.85
1.4 to 2.0
Chromium (Cr), % 3.8 to 5.0
27 to 32
Cobalt (Co), % 7.0 to 9.5
47.5 to 64.1
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 60.6 to 68.3
0 to 3.0
Manganese (Mn), % 0.2 to 0.4
0
Molybdenum (Mo), % 0.5 to 1.3
0 to 1.0
Nickel (Ni), % 0 to 0.3
0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.4
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 17.5 to 19
7.5 to 9.5
Vanadium (V), % 1.8 to 2.4
0