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R30816 Cobalt vs. EN 1.3956 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while EN 1.3956 stainless steel belongs to the iron alloys. They have a modest 40% 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 (8, in this case) are not shown.

For each property being compared, the top bar is R30816 cobalt and the bottom bar is EN 1.3956 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
27
Fatigue Strength, MPa 250
240
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 81
79
Tensile Strength: Ultimate (UTS), MPa 1020
650
Tensile Strength: Yield (Proof), MPa 460
330

Thermal Properties

Latent Heat of Fusion, J/g 300
300
Melting Completion (Liquidus), °C 1540
1420
Melting Onset (Solidus), °C 1460
1380
Specific Heat Capacity, J/kg-K 420
480
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.8
Embodied Carbon, kg CO2/kg material 20
4.8
Embodied Energy, MJ/kg 320
68
Embodied Water, L/kg 440
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
150
Resilience: Unit (Modulus of Resilience), kJ/m3 510
270
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
23
Strength to Weight: Bending, points 25
21
Thermal Shock Resistance, points 28
18

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.060
Chromium (Cr), % 19 to 21
20.5 to 23.5
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
51.9 to 62.1
Manganese (Mn), % 1.0 to 2.0
4.0 to 6.0
Molybdenum (Mo), % 3.5 to 4.5
1.5 to 3.0
Nickel (Ni), % 19 to 21
11.5 to 13.5
Niobium (Nb), % 3.5 to 4.5
0.1 to 0.3
Nitrogen (N), % 0
0.2 to 0.4
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0
Vanadium (V), % 0
0.1 to 0.3