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EN 1.4646 Stainless Steel vs. R31537 Cobalt

EN 1.4646 stainless steel belongs to the iron alloys classification, while R31537 cobalt belongs to the cobalt alloys. They have a modest 20% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is EN 1.4646 stainless steel and the bottom bar is R31537 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 34
14 to 23
Fatigue Strength, MPa 340
310 to 480
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
87
Tensile Strength: Ultimate (UTS), MPa 750
1000 to 1340
Tensile Strength: Yield (Proof), MPa 430
590 to 940

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1390
1360
Melting Onset (Solidus), °C 1340
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 17
13

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 2.8
8.1
Embodied Energy, MJ/kg 41
110
Embodied Water, L/kg 160
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 460
780 to 1990
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 27
33 to 44
Strength to Weight: Bending, points 24
26 to 32
Thermal Shock Resistance, points 16
24 to 32

Alloy Composition

Carbon (C), % 0.020 to 0.1
0 to 0.14
Chromium (Cr), % 17 to 19
26 to 30
Cobalt (Co), % 0
58.9 to 69
Copper (Cu), % 1.5 to 3.0
0
Iron (Fe), % 59 to 67.3
0 to 0.75
Manganese (Mn), % 10.5 to 12.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
5.0 to 7.0
Nickel (Ni), % 3.5 to 4.5
0 to 1.0
Nitrogen (N), % 0.2 to 0.3
0 to 0.25
Phosphorus (P), % 0 to 0.050
0
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0