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SAE-AISI D7 Steel vs. R30008 Cobalt

SAE-AISI D7 steel belongs to the iron alloys classification, while R30008 cobalt belongs to the cobalt alloys. They have a modest 28% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 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 R30008 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
950 to 1700

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1440
1400
Melting Onset (Solidus), °C 1400
1330
Specific Heat Capacity, J/kg-K 480
450
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
8.1
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
31 to 56
Strength to Weight: Bending, points 25 to 48
25 to 37
Thermal Shock Resistance, points 27 to 72
25 to 44

Alloy Composition

Boron (B), % 0
0 to 0.0010
Carbon (C), % 2.2 to 2.5
0 to 0.15
Chromium (Cr), % 11.5 to 13.5
18.5 to 21.5
Cobalt (Co), % 0
39 to 42
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.6 to 81.9
7.6 to 20
Manganese (Mn), % 0 to 0.6
1.0 to 2.0
Molybdenum (Mo), % 0.7 to 1.2
6.5 to 7.5
Nickel (Ni), % 0 to 0.3
15 to 18
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