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SAE-AISI T4 Steel vs. R30006 Cobalt

SAE-AISI T4 steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. There are 20 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI T4 steel and the bottom bar is R30006 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
85
Tensile Strength: Ultimate (UTS), MPa 800 to 2140
900

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1810
1400
Melting Onset (Solidus), °C 1750
1290
Specific Heat Capacity, J/kg-K 410
450
Thermal Conductivity, W/m-K 21
15
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 9.4
8.6
Embodied Carbon, kg CO2/kg material 8.5
7.8
Embodied Energy, MJ/kg 130
110
Embodied Water, L/kg 120
500

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
23
Strength to Weight: Axial, points 24 to 64
29
Strength to Weight: Bending, points 20 to 39
24
Thermal Diffusivity, mm2/s 5.4
3.9
Thermal Shock Resistance, points 24 to 64
26

Alloy Composition

Carbon (C), % 0.7 to 0.8
0.9 to 1.4
Chromium (Cr), % 3.8 to 4.5
27 to 32
Cobalt (Co), % 4.3 to 5.8
48.6 to 68.1
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 66.3 to 72.3
0 to 3.0
Manganese (Mn), % 0.1 to 0.4
0
Molybdenum (Mo), % 0.4 to 1.0
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
4.0 to 6.0
Vanadium (V), % 0.8 to 1.2
0