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R31539 Cobalt vs. EN 1.3956 Stainless Steel

R31539 cobalt belongs to the cobalt alloys classification, while EN 1.3956 stainless steel belongs to the iron alloys. They have a modest 26% 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 (10, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is EN 1.3956 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 13 to 22
27
Fatigue Strength, MPa 310 to 480
240
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
79
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
650
Tensile Strength: Yield (Proof), MPa 590 to 940
330

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1420
Melting Onset (Solidus), °C 1290
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Expansion, µm/m-K 13
13

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 8.2
4.8
Embodied Energy, MJ/kg 110
68
Embodied Water, L/kg 530
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 190
150
Resilience: Unit (Modulus of Resilience), kJ/m3 780 to 2000
270
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33 to 44
23
Strength to Weight: Bending, points 27 to 32
21
Thermal Shock Resistance, points 24 to 32
18

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0
Carbon (C), % 0 to 0.14
0 to 0.060
Chromium (Cr), % 26 to 30
20.5 to 23.5
Cobalt (Co), % 57.7 to 68.7
0
Iron (Fe), % 0 to 0.75
51.9 to 62.1
Lanthanum (La), % 0.030 to 0.2
0
Manganese (Mn), % 0 to 1.0
4.0 to 6.0
Molybdenum (Mo), % 5.0 to 7.0
1.5 to 3.0
Nickel (Ni), % 0 to 1.0
11.5 to 13.5
Niobium (Nb), % 0
0.1 to 0.3
Nitrogen (N), % 0 to 0.25
0.2 to 0.4
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0.1 to 0.3