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EN 1.4981 Stainless Steel vs. EN 2.4964 Cobalt

EN 1.4981 stainless steel belongs to the iron alloys classification, while EN 2.4964 cobalt belongs to the cobalt alloys. They have a modest 29% 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 (6, in this case) are not shown.

For each property being compared, the top bar is EN 1.4981 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, % 39
40
Fatigue Strength, MPa 210
220
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 610
960
Tensile Strength: Yield (Proof), MPa 240
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 470
400
Thermal Conductivity, W/m-K 16
15
Thermal Expansion, µm/m-K 16
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 7.9
9.6
Embodied Carbon, kg CO2/kg material 4.8
9.8
Embodied Energy, MJ/kg 67
140
Embodied Water, L/kg 150
450

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
310
Resilience: Unit (Modulus of Resilience), kJ/m3 150
340
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
21
Strength to Weight: Axial, points 21
28
Strength to Weight: Bending, points 20
23
Thermal Diffusivity, mm2/s 4.3
3.9
Thermal Shock Resistance, points 14
25

Alloy Composition

Carbon (C), % 0.040 to 0.1
0.050 to 0.15
Chromium (Cr), % 15.5 to 17.5
19 to 21
Cobalt (Co), % 0
46.4 to 58
Iron (Fe), % 59.6 to 66.7
0 to 3.0
Manganese (Mn), % 0 to 1.5
0 to 2.0
Molybdenum (Mo), % 1.6 to 2.0
0
Nickel (Ni), % 15.5 to 17.5
9.0 to 11
Niobium (Nb), % 0.4 to 1.2
0
Phosphorus (P), % 0 to 0.035
0 to 0.020
Silicon (Si), % 0.3 to 0.6
0 to 0.4
Sulfur (S), % 0 to 0.015
0 to 0.015
Tungsten (W), % 0
14 to 16