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R30021 Cobalt vs. EN 1.4421 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while EN 1.4421 stainless steel belongs to the iron alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is R30021 cobalt and the bottom bar is EN 1.4421 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
11 to 17
Fatigue Strength, MPa 250
380 to 520
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 700
880 to 1100
Tensile Strength: Yield (Proof), MPa 500
620 to 950

Thermal Properties

Latent Heat of Fusion, J/g 330
280
Melting Completion (Liquidus), °C 1350
1440
Melting Onset (Solidus), °C 1190
1400
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.0
2.6
Embodied Energy, MJ/kg 110
36
Embodied Water, L/kg 520
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
120 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 570
960 to 2270
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 23
31 to 39
Strength to Weight: Bending, points 21
26 to 30
Thermal Diffusivity, mm2/s 3.8
4.4
Thermal Shock Resistance, points 21
31 to 39

Alloy Composition

Carbon (C), % 0.2 to 0.35
0 to 0.060
Chromium (Cr), % 26 to 29
15.5 to 17.5
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
74.4 to 80.5
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 4.5 to 6.0
0 to 0.7
Nickel (Ni), % 2.0 to 3.0
4.0 to 5.5
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 1.5
0 to 0.8
Sulfur (S), % 0
0 to 0.020