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SAE-AISI D7 Steel vs. R30003 Cobalt

SAE-AISI D7 steel belongs to the iron alloys classification, while R30003 cobalt belongs to the cobalt alloys. They have a modest 30% 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 R30003 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 73
83
Tensile Strength: Ultimate (UTS), MPa 800 to 2120
970 to 1720

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Melting Completion (Liquidus), °C 1440
1400
Melting Onset (Solidus), °C 1400
1440
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 27
13
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 10
95
Density, g/cm3 7.6
8.4
Embodied Carbon, kg CO2/kg material 11
8.0
Embodied Energy, MJ/kg 180
110
Embodied Water, L/kg 130
400

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 29 to 78
32 to 57
Strength to Weight: Bending, points 25 to 48
26 to 38
Thermal Diffusivity, mm2/s 7.4
3.3
Thermal Shock Resistance, points 27 to 72
26 to 45

Alloy Composition

Boron (B), % 0
0 to 0.1
Carbon (C), % 2.2 to 2.5
0 to 0.15
Chromium (Cr), % 11.5 to 13.5
19 to 21
Cobalt (Co), % 0
39 to 41
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.6 to 81.9
10 to 20.5
Manganese (Mn), % 0 to 0.6
1.5 to 2.5
Molybdenum (Mo), % 0.7 to 1.2
6.0 to 8.0
Nickel (Ni), % 0 to 0.3
14 to 16
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0 to 0.6
0 to 1.2
Sulfur (S), % 0 to 0.030
0 to 0.015
Vanadium (V), % 3.8 to 4.4
0

Comparable Variants