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SAE-AISI T4 Steel vs. R30155 Cobalt

Both SAE-AISI T4 steel and R30155 cobalt are iron alloys. They have 44% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI T4 steel and the bottom bar is R30155 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
210
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 80
81
Tensile Strength: Ultimate (UTS), MPa 800 to 2140
850

Thermal Properties

Latent Heat of Fusion, J/g 250
300
Melting Completion (Liquidus), °C 1810
1470
Melting Onset (Solidus), °C 1750
1420
Specific Heat Capacity, J/kg-K 410
450
Thermal Conductivity, W/m-K 21
12
Thermal Expansion, µm/m-K 12
14

Otherwise Unclassified Properties

Base Metal Price, % relative 55
80
Density, g/cm3 9.4
8.5
Embodied Carbon, kg CO2/kg material 8.5
9.7
Embodied Energy, MJ/kg 130
150
Embodied Water, L/kg 120
300

Common Calculations

PREN (Pitting Resistance) 37
37
Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
23
Strength to Weight: Axial, points 24 to 64
28
Strength to Weight: Bending, points 20 to 39
24
Thermal Diffusivity, mm2/s 5.4
3.2
Thermal Shock Resistance, points 24 to 64
21

Alloy Composition

Carbon (C), % 0.7 to 0.8
0.080 to 0.16
Chromium (Cr), % 3.8 to 4.5
20 to 22.5
Cobalt (Co), % 4.3 to 5.8
18.5 to 21
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 66.3 to 72.3
24.3 to 36.2
Manganese (Mn), % 0.1 to 0.4
1.0 to 2.0
Molybdenum (Mo), % 0.4 to 1.0
2.5 to 3.5
Nickel (Ni), % 0 to 0.3
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0
0 to 0.2
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 0
0.75 to 1.3
Tungsten (W), % 17.5 to 19
2.0 to 3.0
Vanadium (V), % 0.8 to 1.2
0