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SAE-AISI D2 Steel vs. R31539 Cobalt

SAE-AISI D2 steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI D2 steel and the bottom bar is R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 5.0 to 16
13 to 22
Fatigue Strength, MPa 310 to 860
310 to 480
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
86
Tensile Strength: Ultimate (UTS), MPa 760 to 2000
1000 to 1340
Tensile Strength: Yield (Proof), MPa 470 to 1510
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1440
1360
Melting Onset (Solidus), °C 1390
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 31
13
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 4.3
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 5.1
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 3.4
8.2
Embodied Energy, MJ/kg 50
110
Embodied Water, L/kg 100
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 92 to 100
140 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 570 to 5940
780 to 2000
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 27 to 72
33 to 44
Strength to Weight: Bending, points 24 to 46
27 to 32
Thermal Diffusivity, mm2/s 8.3
3.5
Thermal Shock Resistance, points 25 to 67
24 to 32

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 1.4 to 1.6
0 to 0.14
Chromium (Cr), % 11 to 13
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 81.3 to 86.9
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0 to 0.6
0 to 1.0
Molybdenum (Mo), % 0.7 to 1.2
5.0 to 7.0
Nickel (Ni), % 0 to 0.3
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.6
0 to 1.0
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 0 to 1.1
0

Comparable Variants