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SAE-AISI D7 Steel vs. R30012 Cobalt

SAE-AISI D7 steel belongs to the iron alloys classification, while R30012 cobalt belongs to the cobalt alloys. 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 D7 steel and the bottom bar is R30012 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 73
86
Tensile Strength: Ultimate (UTS), MPa 800 to 2120
830

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1440
1470
Melting Onset (Solidus), °C 1400
1280
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 27
15
Thermal Expansion, µm/m-K 11
12

Otherwise Unclassified Properties

Density, g/cm3 7.6
8.8
Embodied Carbon, kg CO2/kg material 11
8.3
Embodied Energy, MJ/kg 180
120
Embodied Water, L/kg 130
480

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 29 to 78
26
Strength to Weight: Bending, points 25 to 48
22
Thermal Diffusivity, mm2/s 7.4
3.8
Thermal Shock Resistance, points 27 to 72
23

Alloy Composition

Carbon (C), % 2.2 to 2.5
1.4 to 2.0
Chromium (Cr), % 11.5 to 13.5
27 to 32
Cobalt (Co), % 0
47.5 to 64.1
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.6 to 81.9
0 to 3.0
Manganese (Mn), % 0 to 0.6
0
Molybdenum (Mo), % 0.7 to 1.2
0 to 1.0
Nickel (Ni), % 0 to 0.3
0 to 3.0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.6
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
7.5 to 9.5
Vanadium (V), % 3.8 to 4.4
0