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S15500 Stainless Steel vs. EN 2.4964 Cobalt

S15500 stainless steel belongs to the iron alloys classification, while EN 2.4964 cobalt belongs to the cobalt alloys. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 S15500 stainless steel and the bottom bar is EN 2.4964 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 6.8 to 16
40
Fatigue Strength, MPa 350 to 650
220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
86
Tensile Strength: Ultimate (UTS), MPa 890 to 1490
960
Tensile Strength: Yield (Proof), MPa 590 to 1310
390

Thermal Properties

Latent Heat of Fusion, J/g 280
290
Melting Completion (Liquidus), °C 1430
1630
Melting Onset (Solidus), °C 1380
1550
Specific Heat Capacity, J/kg-K 480
400
Thermal Conductivity, W/m-K 17
15
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.8
9.6
Embodied Carbon, kg CO2/kg material 2.7
9.8
Embodied Energy, MJ/kg 39
140
Embodied Water, L/kg 130
450

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 120
310
Resilience: Unit (Modulus of Resilience), kJ/m3 890 to 4460
340
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
21
Strength to Weight: Axial, points 32 to 53
28
Strength to Weight: Bending, points 26 to 37
23
Thermal Diffusivity, mm2/s 4.6
3.9
Thermal Shock Resistance, points 30 to 50
25

Alloy Composition

Carbon (C), % 0 to 0.070
0.050 to 0.15
Chromium (Cr), % 14 to 15.5
19 to 21
Cobalt (Co), % 0
46.4 to 58
Copper (Cu), % 2.5 to 4.5
0
Iron (Fe), % 71.9 to 79.9
0 to 3.0
Manganese (Mn), % 0 to 1.0
0 to 2.0
Nickel (Ni), % 3.5 to 5.5
9.0 to 11
Niobium (Nb), % 0.15 to 0.45
0
Phosphorus (P), % 0 to 0.040
0 to 0.020
Silicon (Si), % 0 to 1.0
0 to 0.4
Sulfur (S), % 0 to 0.030
0 to 0.015
Tungsten (W), % 0
14 to 16