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R30075 Cobalt vs. AISI 418 Stainless Steel

R30075 cobalt belongs to the cobalt alloys classification, while AISI 418 stainless steel belongs to the iron alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R30075 cobalt and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
200
Elongation at Break, % 12
17
Fatigue Strength, MPa 250 to 840
520
Poisson's Ratio 0.29
0.28
Reduction in Area, % 20
50
Shear Modulus, GPa 82 to 98
77
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
1100
Tensile Strength: Yield (Proof), MPa 480 to 840
850

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1360
1500
Melting Onset (Solidus), °C 1290
1460
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 13
25
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
3.1

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.0
Embodied Carbon, kg CO2/kg material 8.1
2.9
Embodied Energy, MJ/kg 110
41
Embodied Water, L/kg 530
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
170
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
1830
Stiffness to Weight: Axial, points 14 to 17
14
Stiffness to Weight: Bending, points 24 to 25
24
Strength to Weight: Axial, points 26 to 42
38
Strength to Weight: Bending, points 22 to 31
29
Thermal Diffusivity, mm2/s 3.5
6.7
Thermal Shock Resistance, points 21 to 29
40

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0.15 to 0.2
Chromium (Cr), % 27 to 30
12 to 14
Cobalt (Co), % 58.7 to 68
0
Iron (Fe), % 0 to 0.75
78.5 to 83.6
Manganese (Mn), % 0 to 1.0
0 to 0.5
Molybdenum (Mo), % 5.0 to 7.0
0 to 0.5
Nickel (Ni), % 0 to 0.5
1.8 to 2.2
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
2.5 to 3.5