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R30016 Cobalt vs. EN 1.4438 Stainless Steel

R30016 cobalt belongs to the cobalt alloys classification, while EN 1.4438 stainless steel belongs to the iron alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is R30016 cobalt and the bottom bar is EN 1.4438 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 8.4
41
Fatigue Strength, MPa 290
220
Impact Strength: V-Notched Charpy, J 8.0
90
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
79
Tensile Strength: Ultimate (UTS), MPa 1010
620
Tensile Strength: Yield (Proof), MPa 580
250

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1270
1400
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
14
Thermal Expansion, µm/m-K 14
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
2.3

Otherwise Unclassified Properties

Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 7.7
4.4
Embodied Energy, MJ/kg 110
60
Embodied Water, L/kg 500
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 72
200
Resilience: Unit (Modulus of Resilience), kJ/m3 770
150
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33
22
Strength to Weight: Bending, points 26
20
Thermal Diffusivity, mm2/s 3.9
3.7
Thermal Shock Resistance, points 24
14

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.030
Chromium (Cr), % 28 to 32
17.5 to 19.5
Cobalt (Co), % 49.6 to 66.9
0
Iron (Fe), % 0 to 3.0
57.3 to 66.5
Manganese (Mn), % 0.5 to 2.0
0 to 2.0
Molybdenum (Mo), % 0 to 1.5
3.0 to 4.0
Nickel (Ni), % 0 to 3.0
13 to 16
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0.2 to 2.0
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Tungsten (W), % 3.5 to 5.5
0