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R31538 Cobalt vs. SAE-AISI D2 Steel

R31538 cobalt belongs to the cobalt alloys classification, while SAE-AISI D2 steel belongs to the iron 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 R31538 cobalt and the bottom bar is SAE-AISI D2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 13 to 23
5.0 to 16
Fatigue Strength, MPa 310 to 480
310 to 860
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
75
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
760 to 2000
Tensile Strength: Yield (Proof), MPa 580 to 930
470 to 1510

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.1
3.4
Embodied Energy, MJ/kg 110
50
Embodied Water, L/kg 530
100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
92 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
570 to 5940
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 34 to 45
27 to 72
Strength to Weight: Bending, points 27 to 32
24 to 46
Thermal Diffusivity, mm2/s 3.5
8.3
Thermal Shock Resistance, points 25 to 33
25 to 67

Alloy Composition

Carbon (C), % 0.15 to 0.35
1.4 to 1.6
Chromium (Cr), % 26 to 30
11 to 13
Cobalt (Co), % 58.7 to 68.9
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0 to 0.75
81.3 to 86.9
Manganese (Mn), % 0 to 1.0
0 to 0.6
Molybdenum (Mo), % 5.0 to 7.0
0.7 to 1.2
Nickel (Ni), % 0 to 1.0
0 to 0.3
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.6
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0 to 1.1

Comparable Variants