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AISI 420 Stainless Steel vs. R30001 Cobalt

AISI 420 stainless steel belongs to the iron alloys classification, while R30001 cobalt belongs to the cobalt alloys. There are 23 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is AISI 420 stainless steel and the bottom bar is R30001 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 8.0 to 15
1.0
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
86
Tensile Strength: Ultimate (UTS), MPa 690 to 1720
620

Thermal Properties

Latent Heat of Fusion, J/g 280
310
Melting Completion (Liquidus), °C 1510
1530
Melting Onset (Solidus), °C 1450
1260
Specific Heat Capacity, J/kg-K 480
430
Thermal Conductivity, W/m-K 27
15
Thermal Expansion, µm/m-K 10
11

Electrical Properties

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

Otherwise Unclassified Properties

Density, g/cm3 7.7
9.0
Embodied Carbon, kg CO2/kg material 2.0
8.9
Embodied Energy, MJ/kg 28
130
Embodied Water, L/kg 100
460

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
22
Strength to Weight: Axial, points 25 to 62
19
Strength to Weight: Bending, points 22 to 41
18
Thermal Diffusivity, mm2/s 7.3
3.7
Thermal Shock Resistance, points 25 to 62
19

Alloy Composition

Carbon (C), % 0.15 to 0.4
2.0 to 3.0
Chromium (Cr), % 12 to 14
28 to 32
Cobalt (Co), % 0
43 to 59
Iron (Fe), % 82.3 to 87.9
0 to 3.0
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 0 to 0.5
0 to 1.0
Nickel (Ni), % 0 to 0.75
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
11 to 13