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S17400 Stainless Steel vs. EN 2.4964 Cobalt

S17400 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 S17400 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, % 11 to 21
40
Fatigue Strength, MPa 380 to 670
220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 75
86
Tensile Strength: Ultimate (UTS), MPa 910 to 1390
960
Tensile Strength: Yield (Proof), MPa 580 to 1250
390

Thermal Properties

Latent Heat of Fusion, J/g 280
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 17
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 2.6
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 140 to 160
310
Resilience: Unit (Modulus of Resilience), kJ/m3 880 to 4060
340
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
21
Strength to Weight: Axial, points 32 to 49
28
Strength to Weight: Bending, points 27 to 35
23
Thermal Diffusivity, mm2/s 4.5
3.9
Thermal Shock Resistance, points 30 to 46
25

Alloy Composition

Carbon (C), % 0 to 0.070
0.050 to 0.15
Chromium (Cr), % 15 to 17
19 to 21
Cobalt (Co), % 0
46.4 to 58
Copper (Cu), % 3.0 to 5.0
0
Iron (Fe), % 70.4 to 78.9
0 to 3.0
Manganese (Mn), % 0 to 1.0
0 to 2.0
Nickel (Ni), % 3.0 to 5.0
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