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SAE-AISI T4 Steel vs. R30605 Cobalt

SAE-AISI T4 steel belongs to the iron alloys classification, while R30605 cobalt belongs to the cobalt alloys. They have a modest 26% 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 (7, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI T4 steel and the bottom bar is R30605 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
1130 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Melting Completion (Liquidus), °C 1810
1410
Melting Onset (Solidus), °C 1750
1330
Specific Heat Capacity, J/kg-K 410
410
Thermal Conductivity, W/m-K 21
9.6
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 9.4
9.6
Embodied Carbon, kg CO2/kg material 8.5
9.8
Embodied Energy, MJ/kg 130
140
Embodied Water, L/kg 120
450

Common Calculations

Stiffness to Weight: Axial, points 12
12
Stiffness to Weight: Bending, points 21
21
Strength to Weight: Axial, points 24 to 64
33 to 55
Strength to Weight: Bending, points 20 to 39
25 to 36
Thermal Diffusivity, mm2/s 5.4
2.5
Thermal Shock Resistance, points 24 to 64
31 to 52

Alloy Composition

Carbon (C), % 0.7 to 0.8
0.050 to 0.15
Chromium (Cr), % 3.8 to 4.5
19 to 21
Cobalt (Co), % 4.3 to 5.8
46.4 to 57
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
1.0 to 2.0
Molybdenum (Mo), % 0.4 to 1.0
0
Nickel (Ni), % 0 to 0.3
9.0 to 11
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0.2 to 0.4
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 17.5 to 19
14 to 16
Vanadium (V), % 0.8 to 1.2
0

Comparable Variants