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SAE-AISI D7 Steel vs. G-CoCr28 Cobalt

SAE-AISI D7 steel belongs to the iron alloys classification, while G-CoCr28 cobalt belongs to the cobalt alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 21 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 D7 steel and the bottom bar is G-CoCr28 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 73
83
Tensile Strength: Ultimate (UTS), MPa 800 to 2120
560

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1440
1330
Melting Onset (Solidus), °C 1400
1270
Specific Heat Capacity, J/kg-K 480
470
Thermal Conductivity, W/m-K 27
8.5
Thermal Expansion, µm/m-K 11
14

Otherwise Unclassified Properties

Base Metal Price, % relative 10
100
Density, g/cm3 7.6
8.1
Embodied Carbon, kg CO2/kg material 11
6.2
Embodied Energy, MJ/kg 180
84
Embodied Water, L/kg 130
440

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 29 to 78
19
Strength to Weight: Bending, points 25 to 48
19
Thermal Diffusivity, mm2/s 7.4
2.2
Thermal Shock Resistance, points 27 to 72
14

Alloy Composition

Carbon (C), % 2.2 to 2.5
0.050 to 0.25
Chromium (Cr), % 11.5 to 13.5
27 to 30
Cobalt (Co), % 0
48 to 52
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.6 to 81.9
9.7 to 24.5
Manganese (Mn), % 0 to 0.6
0 to 1.5
Molybdenum (Mo), % 0.7 to 1.2
0 to 0.5
Nickel (Ni), % 0 to 0.3
0 to 4.0
Niobium (Nb), % 0
0 to 0.5
Phosphorus (P), % 0 to 0.030
0 to 0.040
Silicon (Si), % 0 to 0.6
0.5 to 1.5
Sulfur (S), % 0 to 0.030
0 to 0.030
Vanadium (V), % 3.8 to 4.4
0