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R30008 Cobalt vs. AISI 420 Stainless Steel

R30008 cobalt belongs to the cobalt alloys classification, while AISI 420 stainless steel belongs to the iron alloys. They have a modest 29% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is R30008 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, % 1.1 to 73
8.0 to 15
Fatigue Strength, MPa 320 to 530
220 to 670
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 83
76
Tensile Strength: Ultimate (UTS), MPa 950 to 1700
690 to 1720
Tensile Strength: Yield (Proof), MPa 500 to 1080
380 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1400
1510
Melting Onset (Solidus), °C 1330
1450
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 13
10

Otherwise Unclassified Properties

Base Metal Price, % relative 95
7.5
Density, g/cm3 8.4
7.7
Embodied Carbon, kg CO2/kg material 8.1
2.0
Embodied Energy, MJ/kg 110
28
Embodied Water, L/kg 400
100

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 590 to 2720
380 to 4410
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 31 to 56
25 to 62
Strength to Weight: Bending, points 25 to 37
22 to 41
Thermal Shock Resistance, points 25 to 44
25 to 62

Alloy Composition

Boron (B), % 0 to 0.0010
0
Carbon (C), % 0 to 0.15
0.15 to 0.4
Chromium (Cr), % 18.5 to 21.5
12 to 14
Cobalt (Co), % 39 to 42
0
Iron (Fe), % 7.6 to 20
82.3 to 87.9
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 6.5 to 7.5
0 to 0.5
Nickel (Ni), % 15 to 18
0 to 0.75
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 1.2
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.030

Comparable Variants