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EN 1.4911 Stainless Steel vs. R30016 Cobalt

EN 1.4911 stainless steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt 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 (10, in this case) are not shown.

For each property being compared, the top bar is EN 1.4911 stainless steel and the bottom bar is R30016 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 11
8.4
Fatigue Strength, MPa 530
290
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 76
85
Tensile Strength: Ultimate (UTS), MPa 1070
1010
Tensile Strength: Yield (Proof), MPa 970
580

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Melting Completion (Liquidus), °C 1450
1360
Melting Onset (Solidus), °C 1410
1270
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 20
15
Thermal Expansion, µm/m-K 11
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.7
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.9
8.5
Embodied Carbon, kg CO2/kg material 3.4
7.7
Embodied Energy, MJ/kg 49
110
Embodied Water, L/kg 130
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
72
Resilience: Unit (Modulus of Resilience), kJ/m3 2410
770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 38
33
Strength to Weight: Bending, points 30
26
Thermal Diffusivity, mm2/s 5.4
3.9
Thermal Shock Resistance, points 37
24

Alloy Composition

Boron (B), % 0.0050 to 0.015
0
Carbon (C), % 0.050 to 0.12
0.9 to 1.4
Chromium (Cr), % 9.8 to 11.2
28 to 32
Cobalt (Co), % 5.0 to 7.0
49.6 to 66.9
Iron (Fe), % 75.7 to 83.8
0 to 3.0
Manganese (Mn), % 0.3 to 1.3
0.5 to 2.0
Molybdenum (Mo), % 0.5 to 1.0
0 to 1.5
Nickel (Ni), % 0.2 to 1.2
0 to 3.0
Niobium (Nb), % 0.2 to 0.5
0
Nitrogen (N), % 0 to 0.035
0
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0.1 to 0.8
0.2 to 2.0
Sulfur (S), % 0 to 0.015
0
Tungsten (W), % 0 to 0.7
3.5 to 5.5
Vanadium (V), % 0.1 to 0.4
0