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SAE-AISI A9 Steel vs. R31537 Cobalt

SAE-AISI A9 steel belongs to the iron alloys classification, while R31537 cobalt belongs to the cobalt alloys. There are 22 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 A9 steel and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
87
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
1000 to 1340

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1410
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 35
13
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 4.7
8.1
Embodied Energy, MJ/kg 70
110
Embodied Water, L/kg 82
530

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 28 to 73
33 to 44
Strength to Weight: Bending, points 24 to 46
26 to 32
Thermal Diffusivity, mm2/s 9.6
3.4
Thermal Shock Resistance, points 25 to 66
24 to 32

Alloy Composition

Carbon (C), % 0.45 to 0.55
0 to 0.14
Chromium (Cr), % 4.8 to 5.5
26 to 30
Cobalt (Co), % 0
58.9 to 69
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 87 to 90.5
0 to 0.75
Manganese (Mn), % 0 to 0.5
0 to 1.0
Molybdenum (Mo), % 1.3 to 1.8
5.0 to 7.0
Nickel (Ni), % 1.3 to 1.8
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 1.0 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 0.8 to 1.4
0

Comparable Variants