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EN 1.4655 Stainless Steel vs. R30016 Cobalt

EN 1.4655 stainless steel belongs to the iron alloys classification, while R30016 cobalt belongs to the cobalt alloys. They have a modest 28% 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 1.4655 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, % 23 to 25
8.4
Fatigue Strength, MPa 320
290
Poisson's Ratio 0.27
0.28
Shear Modulus, GPa 78
85
Tensile Strength: Ultimate (UTS), MPa 720 to 730
1010
Tensile Strength: Yield (Proof), MPa 450 to 480
580

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1420
1360
Melting Onset (Solidus), °C 1370
1270
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 13
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.0

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.5
Embodied Carbon, kg CO2/kg material 2.9
7.7
Embodied Energy, MJ/kg 41
110
Embodied Water, L/kg 160
500

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150 to 160
72
Resilience: Unit (Modulus of Resilience), kJ/m3 510 to 580
770
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 26
33
Strength to Weight: Bending, points 23
26
Thermal Diffusivity, mm2/s 4.0
3.9
Thermal Shock Resistance, points 20
24

Alloy Composition

Carbon (C), % 0 to 0.030
0.9 to 1.4
Chromium (Cr), % 22 to 24
28 to 32
Cobalt (Co), % 0
49.6 to 66.9
Copper (Cu), % 1.0 to 3.0
0
Iron (Fe), % 63.6 to 73.4
0 to 3.0
Manganese (Mn), % 0 to 2.0
0.5 to 2.0
Molybdenum (Mo), % 0.1 to 0.6
0 to 1.5
Nickel (Ni), % 3.5 to 5.5
0 to 3.0
Nitrogen (N), % 0.050 to 0.2
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0 to 1.0
0.2 to 2.0
Sulfur (S), % 0 to 0.015
0
Tungsten (W), % 0
3.5 to 5.5