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S20910 Stainless Steel vs. EN 2.4964 Cobalt

S20910 stainless steel belongs to the iron alloys classification, while EN 2.4964 cobalt belongs to the cobalt alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is S20910 stainless steel and the bottom bar is EN 2.4964 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 14 to 39
40
Fatigue Strength, MPa 310 to 460
220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 79
86
Tensile Strength: Ultimate (UTS), MPa 780 to 940
960
Tensile Strength: Yield (Proof), MPa 430 to 810
390

Thermal Properties

Latent Heat of Fusion, J/g 300
290
Melting Completion (Liquidus), °C 1420
1630
Melting Onset (Solidus), °C 1380
1550
Specific Heat Capacity, J/kg-K 480
400
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 16
12

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.6
Embodied Carbon, kg CO2/kg material 4.8
9.8
Embodied Energy, MJ/kg 68
140
Embodied Water, L/kg 180
450

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 260
310
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 1640
340
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
21
Strength to Weight: Axial, points 28 to 33
28
Strength to Weight: Bending, points 24 to 27
23
Thermal Diffusivity, mm2/s 3.6
3.9
Thermal Shock Resistance, points 17 to 21
25

Alloy Composition

Carbon (C), % 0 to 0.060
0.050 to 0.15
Chromium (Cr), % 20.5 to 23.5
19 to 21
Cobalt (Co), % 0
46.4 to 58
Iron (Fe), % 52.1 to 62.1
0 to 3.0
Manganese (Mn), % 4.0 to 6.0
0 to 2.0
Molybdenum (Mo), % 1.5 to 3.0
0
Nickel (Ni), % 11.5 to 13.5
9.0 to 11
Niobium (Nb), % 0.1 to 0.3
0
Nitrogen (N), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 0.75
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 0
14 to 16
Vanadium (V), % 0.1 to 0.3
0