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R30816 Cobalt vs. EN 1.4594 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while EN 1.4594 stainless steel belongs to the iron alloys. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 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 R30816 cobalt and the bottom bar is EN 1.4594 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
11 to 17
Fatigue Strength, MPa 250
490 to 620
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 81
76
Tensile Strength: Ultimate (UTS), MPa 1020
1020 to 1170
Tensile Strength: Yield (Proof), MPa 460
810 to 1140

Thermal Properties

Latent Heat of Fusion, J/g 300
280
Melting Completion (Liquidus), °C 1540
1450
Melting Onset (Solidus), °C 1460
1410
Specific Heat Capacity, J/kg-K 420
470
Thermal Conductivity, W/m-K 13
16
Thermal Expansion, µm/m-K 12
11

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.9
Embodied Carbon, kg CO2/kg material 20
3.2
Embodied Energy, MJ/kg 320
45
Embodied Water, L/kg 440
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
110 to 190
Resilience: Unit (Modulus of Resilience), kJ/m3 510
1660 to 3320
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
36 to 41
Strength to Weight: Bending, points 25
29 to 31
Thermal Diffusivity, mm2/s 3.3
4.4
Thermal Shock Resistance, points 28
34 to 39

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.070
Chromium (Cr), % 19 to 21
13 to 15
Cobalt (Co), % 40 to 49.8
0
Copper (Cu), % 0
1.2 to 2.0
Iron (Fe), % 0 to 5.0
72.6 to 79.5
Manganese (Mn), % 1.0 to 2.0
0 to 1.0
Molybdenum (Mo), % 3.5 to 4.5
1.2 to 2.0
Nickel (Ni), % 19 to 21
5.0 to 6.0
Niobium (Nb), % 3.5 to 4.5
0.15 to 0.6
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 0.7
Sulfur (S), % 0 to 0.030
0 to 0.015
Tantalum (Ta), % 3.5 to 4.5
0
Tungsten (W), % 3.5 to 4.5
0