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SAE-AISI D7 Steel vs. R30035 Cobalt

SAE-AISI D7 steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 21 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI D7 steel and the bottom bar is R30035 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220 to 230
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 73
84 to 89
Tensile Strength: Ultimate (UTS), MPa 800 to 2120
900 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1440
1440
Melting Onset (Solidus), °C 1400
1320
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 27
11
Thermal Expansion, µm/m-K 11
13

Otherwise Unclassified Properties

Base Metal Price, % relative 10
100
Density, g/cm3 7.6
8.7
Embodied Carbon, kg CO2/kg material 11
10
Embodied Energy, MJ/kg 180
140
Embodied Water, L/kg 130
410

Common Calculations

Stiffness to Weight: Axial, points 14
14 to 15
Stiffness to Weight: Bending, points 25
23 to 24
Strength to Weight: Axial, points 29 to 78
29 to 61
Strength to Weight: Bending, points 25 to 48
24 to 39
Thermal Diffusivity, mm2/s 7.4
3.0
Thermal Shock Resistance, points 27 to 72
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 2.2 to 2.5
0 to 0.025
Chromium (Cr), % 11.5 to 13.5
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 76.6 to 81.9
0 to 1.0
Manganese (Mn), % 0 to 0.6
0 to 0.15
Molybdenum (Mo), % 0.7 to 1.2
9.0 to 10.5
Nickel (Ni), % 0 to 0.3
33 to 37
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0 to 0.6
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0
Vanadium (V), % 3.8 to 4.4
0

Comparable Variants