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R30605 Cobalt vs. AISI 420 Stainless Steel

R30605 cobalt belongs to the cobalt alloys classification, while AISI 420 stainless steel belongs to the iron alloys. There are 25 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 R30605 cobalt and the bottom bar is AISI 420 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
190
Elongation at Break, % 34
8.0 to 15
Fatigue Strength, MPa 260 to 590
220 to 670
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 81
76
Tensile Strength: Ultimate (UTS), MPa 1130 to 1900
690 to 1720
Tensile Strength: Yield (Proof), MPa 470 to 1600
380 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 290
280
Melting Completion (Liquidus), °C 1410
1510
Melting Onset (Solidus), °C 1330
1450
Specific Heat Capacity, J/kg-K 410
480
Thermal Conductivity, W/m-K 9.6
27
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
3.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
3.5

Otherwise Unclassified Properties

Density, g/cm3 9.6
7.7
Embodied Carbon, kg CO2/kg material 9.8
2.0
Embodied Energy, MJ/kg 140
28
Embodied Water, L/kg 450
100

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 33 to 55
25 to 62
Strength to Weight: Bending, points 25 to 36
22 to 41
Thermal Diffusivity, mm2/s 2.5
7.3
Thermal Shock Resistance, points 31 to 52
25 to 62

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.15 to 0.4
Chromium (Cr), % 19 to 21
12 to 14
Cobalt (Co), % 46.4 to 57
0
Iron (Fe), % 0 to 3.0
82.3 to 87.9
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 9.0 to 11
0 to 0.75
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 14 to 16
0

Comparable Variants