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R30012 Cobalt vs. EN 1.4421 Stainless Steel

R30012 cobalt belongs to the cobalt alloys classification, while EN 1.4421 stainless steel belongs to the iron alloys. They have a modest 20% 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 R30012 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, % 1.0
11 to 17
Fatigue Strength, MPa 320
380 to 520
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 86
77
Tensile Strength: Ultimate (UTS), MPa 830
880 to 1100
Tensile Strength: Yield (Proof), MPa 650
620 to 950

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1470
1440
Melting Onset (Solidus), °C 1280
1400
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 12
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.8
7.8
Embodied Carbon, kg CO2/kg material 8.3
2.6
Embodied Energy, MJ/kg 120
36
Embodied Water, L/kg 480
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.7
120 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 960
960 to 2270
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26
31 to 39
Strength to Weight: Bending, points 22
26 to 30
Thermal Diffusivity, mm2/s 3.8
4.4
Thermal Shock Resistance, points 23
31 to 39

Alloy Composition

Carbon (C), % 1.4 to 2.0
0 to 0.060
Chromium (Cr), % 27 to 32
15.5 to 17.5
Cobalt (Co), % 47.5 to 64.1
0
Iron (Fe), % 0 to 3.0
74.4 to 80.5
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 0 to 1.0
0 to 0.7
Nickel (Ni), % 0 to 3.0
4.0 to 5.5
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 2.0
0 to 0.8
Sulfur (S), % 0
0 to 0.020
Tungsten (W), % 7.5 to 9.5
0