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SAE-AISI S7 Steel vs. R30035 Cobalt

SAE-AISI S7 steel belongs to the iron alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 23 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 S7 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 0.29
0.29
Shear Modulus, GPa 74
84 to 89
Tensile Strength: Ultimate (UTS), MPa 670 to 2030
900 to 1900

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1460
1440
Melting Onset (Solidus), °C 1420
1320
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 40
11
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.8
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
100
Density, g/cm3 7.8
8.7
Embodied Carbon, kg CO2/kg material 2.3
10
Embodied Energy, MJ/kg 31
140
Embodied Water, L/kg 65
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 24 to 72
29 to 61
Strength to Weight: Bending, points 22 to 46
24 to 39
Thermal Diffusivity, mm2/s 11
3.0
Thermal Shock Resistance, points 22 to 66
23 to 46

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0.45 to 0.55
0 to 0.025
Chromium (Cr), % 3.0 to 3.5
19 to 21
Cobalt (Co), % 0
29.1 to 39
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 91.6 to 94.9
0 to 1.0
Manganese (Mn), % 0.2 to 0.9
0 to 0.15
Molybdenum (Mo), % 1.3 to 1.8
9.0 to 10.5
Nickel (Ni), % 0
33 to 37
Phosphorus (P), % 0 to 0.030
0 to 0.015
Silicon (Si), % 0.2 to 1.0
0 to 0.15
Sulfur (S), % 0 to 0.030
0 to 0.010
Titanium (Ti), % 0
0 to 1.0
Vanadium (V), % 0 to 0.3
0

Comparable Variants