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R30075 Cobalt vs. EN 1.4547 Stainless Steel

R30075 cobalt belongs to the cobalt alloys classification, while EN 1.4547 stainless steel belongs to the iron alloys. They have a modest 28% 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 (8, in this case) are not shown.

For each property being compared, the top bar is R30075 cobalt and the bottom bar is EN 1.4547 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210 to 250
200
Elongation at Break, % 12
39
Fatigue Strength, MPa 250 to 840
290
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 82 to 98
80
Tensile Strength: Ultimate (UTS), MPa 780 to 1280
750
Tensile Strength: Yield (Proof), MPa 480 to 840
340

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1470
Melting Onset (Solidus), °C 1290
1420
Specific Heat Capacity, J/kg-K 450
460
Thermal Conductivity, W/m-K 13
14
Thermal Expansion, µm/m-K 12
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.3

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.0
Embodied Carbon, kg CO2/kg material 8.1
5.6
Embodied Energy, MJ/kg 110
75
Embodied Water, L/kg 530
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 84 to 140
240
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 1410
290
Stiffness to Weight: Axial, points 14 to 17
14
Stiffness to Weight: Bending, points 24 to 25
24
Strength to Weight: Axial, points 26 to 42
26
Strength to Weight: Bending, points 22 to 31
23
Thermal Diffusivity, mm2/s 3.5
3.8
Thermal Shock Resistance, points 21 to 29
16

Alloy Composition

Aluminum (Al), % 0 to 0.1
0
Boron (B), % 0 to 0.010
0
Carbon (C), % 0 to 0.35
0 to 0.020
Chromium (Cr), % 27 to 30
19.5 to 20.5
Cobalt (Co), % 58.7 to 68
0
Copper (Cu), % 0
0.5 to 1.0
Iron (Fe), % 0 to 0.75
51 to 56.3
Manganese (Mn), % 0 to 1.0
0 to 1.0
Molybdenum (Mo), % 5.0 to 7.0
6.0 to 7.0
Nickel (Ni), % 0 to 0.5
17.5 to 18.5
Nitrogen (N), % 0 to 0.25
0.18 to 0.25
Phosphorus (P), % 0 to 0.020
0 to 0.030
Silicon (Si), % 0 to 1.0
0 to 0.7
Sulfur (S), % 0 to 0.010
0 to 0.010
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0 to 0.2
0