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EN 1.4646 Stainless Steel vs. R30021 Cobalt

EN 1.4646 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 23% 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 R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 34
9.0
Fatigue Strength, MPa 340
250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 750
700
Tensile Strength: Yield (Proof), MPa 430
500

Thermal Properties

Latent Heat of Fusion, J/g 290
330
Melting Completion (Liquidus), °C 1390
1350
Melting Onset (Solidus), °C 1340
1190
Specific Heat Capacity, J/kg-K 480
450
Thermal Expansion, µm/m-K 17
11

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 2.8
8.0
Embodied Energy, MJ/kg 41
110
Embodied Water, L/kg 160
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
57
Resilience: Unit (Modulus of Resilience), kJ/m3 460
570
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 27
23
Strength to Weight: Bending, points 24
21
Thermal Shock Resistance, points 16
21

Alloy Composition

Carbon (C), % 0.020 to 0.1
0.2 to 0.35
Chromium (Cr), % 17 to 19
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 1.5 to 3.0
0
Iron (Fe), % 59 to 67.3
0 to 3.0
Manganese (Mn), % 10.5 to 12.5
0
Molybdenum (Mo), % 0 to 0.5
4.5 to 6.0
Nickel (Ni), % 3.5 to 4.5
2.0 to 3.0
Nitrogen (N), % 0.2 to 0.3
0
Phosphorus (P), % 0 to 0.050
0
Silicon (Si), % 0 to 1.0
0 to 1.5
Sulfur (S), % 0 to 0.015
0