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R30816 Cobalt vs. EN 1.4424 Stainless Steel

R30816 cobalt belongs to the cobalt alloys classification, while EN 1.4424 stainless steel belongs to the iron alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 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 1.4424 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
230
Elastic (Young's, Tensile) Modulus, GPa 210
200
Elongation at Break, % 23
28
Fatigue Strength, MPa 250
350 to 370
Poisson's Ratio 0.3
0.28
Shear Modulus, GPa 81
78
Tensile Strength: Ultimate (UTS), MPa 1020
800
Tensile Strength: Yield (Proof), MPa 460
480 to 500

Thermal Properties

Latent Heat of Fusion, J/g 300
310
Melting Completion (Liquidus), °C 1540
1430
Melting Onset (Solidus), °C 1460
1390
Specific Heat Capacity, J/kg-K 420
480
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Density, g/cm3 9.1
7.7
Embodied Carbon, kg CO2/kg material 20
3.4
Embodied Energy, MJ/kg 320
46
Embodied Water, L/kg 440
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
190 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 510
580 to 640
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 22
25
Strength to Weight: Axial, points 31
29
Strength to Weight: Bending, points 25
25
Thermal Diffusivity, mm2/s 3.3
3.5
Thermal Shock Resistance, points 28
23

Alloy Composition

Carbon (C), % 0.32 to 0.42
0 to 0.030
Chromium (Cr), % 19 to 21
18 to 19
Cobalt (Co), % 40 to 49.8
0
Iron (Fe), % 0 to 5.0
68.6 to 72.4
Manganese (Mn), % 1.0 to 2.0
1.2 to 2.0
Molybdenum (Mo), % 3.5 to 4.5
2.5 to 3.0
Nickel (Ni), % 19 to 21
4.5 to 5.2
Niobium (Nb), % 3.5 to 4.5
0
Nitrogen (N), % 0
0.050 to 0.1
Phosphorus (P), % 0 to 0.040
0 to 0.035
Silicon (Si), % 0 to 1.0
1.4 to 2.0
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