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R30006 Cobalt vs. SAE-AISI 81B45 Steel

R30006 cobalt belongs to the cobalt alloys classification, while SAE-AISI 81B45 steel belongs to the iron alloys. There are 27 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 R30006 cobalt and the bottom bar is SAE-AISI 81B45 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 1.0
12 to 24
Fatigue Strength, MPa 260
250 to 350
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 85
73
Tensile Strength: Ultimate (UTS), MPa 900
540 to 670
Tensile Strength: Yield (Proof), MPa 540
350 to 560

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1400
1460
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
40
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
8.3

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 7.8
1.5
Embodied Energy, MJ/kg 110
20
Embodied Water, L/kg 500
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
77 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 670
320 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 29
19 to 24
Strength to Weight: Bending, points 24
19 to 22
Thermal Diffusivity, mm2/s 3.9
11
Thermal Shock Resistance, points 26
17 to 21

Alloy Composition

Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0.9 to 1.4
0.43 to 0.48
Chromium (Cr), % 27 to 32
0.35 to 0.55
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
97 to 98
Manganese (Mn), % 0
0.75 to 1.0
Molybdenum (Mo), % 0 to 1.0
0.080 to 0.15
Nickel (Ni), % 0 to 3.0
0.2 to 0.4
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 2.0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Tungsten (W), % 4.0 to 6.0
0