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S17700 Stainless Steel vs. EN 2.4964 Cobalt

S17700 stainless steel belongs to the iron alloys classification, while EN 2.4964 cobalt belongs to the cobalt alloys. They have a modest 26% 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 (7, in this case) are not shown.

For each property being compared, the top bar is S17700 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, % 1.0 to 23
40
Fatigue Strength, MPa 290 to 560
220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
86
Tensile Strength: Ultimate (UTS), MPa 1180 to 1650
960
Tensile Strength: Yield (Proof), MPa 430 to 1210
390

Thermal Properties

Latent Heat of Fusion, J/g 290
290
Melting Completion (Liquidus), °C 1440
1630
Melting Onset (Solidus), °C 1400
1550
Specific Heat Capacity, J/kg-K 480
400
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 11
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.3
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
1.8

Otherwise Unclassified Properties

Density, g/cm3 7.7
9.6
Embodied Carbon, kg CO2/kg material 2.8
9.8
Embodied Energy, MJ/kg 40
140
Embodied Water, L/kg 150
450

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15 to 210
310
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 3750
340
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
21
Strength to Weight: Axial, points 42 to 59
28
Strength to Weight: Bending, points 32 to 40
23
Thermal Diffusivity, mm2/s 4.1
3.9
Thermal Shock Resistance, points 39 to 54
25

Alloy Composition

Aluminum (Al), % 0.75 to 1.5
0
Carbon (C), % 0 to 0.090
0.050 to 0.15
Chromium (Cr), % 16 to 18
19 to 21
Cobalt (Co), % 0
46.4 to 58
Iron (Fe), % 70.5 to 76.8
0 to 3.0
Manganese (Mn), % 0 to 1.0
0 to 2.0
Nickel (Ni), % 6.5 to 7.8
9.0 to 11
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