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R30016 Cobalt vs. EN 1.4305 Stainless Steel

R30016 cobalt belongs to the cobalt alloys classification, while EN 1.4305 stainless steel belongs to the iron alloys. They have a modest 23% 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 (11, in this case) are not shown.

For each property being compared, the top bar is R30016 cobalt and the bottom bar is EN 1.4305 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 8.4
14 to 40
Fatigue Strength, MPa 290
190 to 330
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 1010
610 to 900
Tensile Strength: Yield (Proof), MPa 580
220 to 570

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1360
1420
Melting Onset (Solidus), °C 1270
1380
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
15
Thermal Expansion, µm/m-K 14
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
2.7

Otherwise Unclassified Properties

Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 7.7
3.0
Embodied Energy, MJ/kg 110
42
Embodied Water, L/kg 500
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 72
110 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 770
120 to 830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 33
22 to 32
Strength to Weight: Bending, points 26
20 to 27
Thermal Diffusivity, mm2/s 3.9
4.0
Thermal Shock Resistance, points 24
14 to 20

Alloy Composition

Carbon (C), % 0.9 to 1.4
0 to 0.1
Chromium (Cr), % 28 to 32
17 to 19
Cobalt (Co), % 49.6 to 66.9
0
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 0 to 3.0
66.4 to 74.9
Manganese (Mn), % 0.5 to 2.0
0 to 2.0
Molybdenum (Mo), % 0 to 1.5
0
Nickel (Ni), % 0 to 3.0
8.0 to 10
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0.2 to 2.0
0 to 1.0
Sulfur (S), % 0
0.15 to 0.35
Tungsten (W), % 3.5 to 5.5
0