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AISI 420 Stainless Steel vs. R30016 Cobalt

AISI 420 stainless steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is AISI 420 stainless steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 8.0 to 15
8.4
Fatigue Strength, MPa 220 to 670
290
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
85
Tensile Strength: Ultimate (UTS), MPa 690 to 1720
1010
Tensile Strength: Yield (Proof), MPa 380 to 1310
580

Thermal Properties

Latent Heat of Fusion, J/g 280
320
Melting Completion (Liquidus), °C 1510
1360
Melting Onset (Solidus), °C 1450
1270
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 27
15
Thermal Expansion, µm/m-K 10
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.0
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.5
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 2.0
7.7
Embodied Energy, MJ/kg 28
110
Embodied Water, L/kg 100
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 88 to 130
72
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 4410
770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25 to 62
33
Strength to Weight: Bending, points 22 to 41
26
Thermal Diffusivity, mm2/s 7.3
3.9
Thermal Shock Resistance, points 25 to 62
24

Alloy Composition

Carbon (C), % 0.15 to 0.4
0.9 to 1.4
Chromium (Cr), % 12 to 14
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Iron (Fe), % 82.3 to 87.9
0 to 3.0
Manganese (Mn), % 0 to 1.0
0.5 to 2.0
Molybdenum (Mo), % 0 to 0.5
0 to 1.5
Nickel (Ni), % 0 to 0.75
0 to 3.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0.2 to 2.0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0
3.5 to 5.5