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EN 1.4424 Stainless Steel vs. R30021 Cobalt

EN 1.4424 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 26% 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 (9, in this case) are not shown.

For each property being compared, the top bar is EN 1.4424 stainless steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 28
9.0
Fatigue Strength, MPa 350 to 370
250
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
86
Tensile Strength: Ultimate (UTS), MPa 800
700
Tensile Strength: Yield (Proof), MPa 480 to 500
500

Thermal Properties

Latent Heat of Fusion, J/g 310
330
Melting Completion (Liquidus), °C 1430
1350
Melting Onset (Solidus), °C 1390
1190
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 12
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.7
8.4
Embodied Carbon, kg CO2/kg material 3.4
8.0
Embodied Energy, MJ/kg 46
110
Embodied Water, L/kg 140
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190 to 200
57
Resilience: Unit (Modulus of Resilience), kJ/m3 580 to 640
570
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 29
23
Strength to Weight: Bending, points 25
21
Thermal Diffusivity, mm2/s 3.5
3.8
Thermal Shock Resistance, points 23
21

Alloy Composition

Carbon (C), % 0 to 0.030
0.2 to 0.35
Chromium (Cr), % 18 to 19
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Iron (Fe), % 68.6 to 72.4
0 to 3.0
Manganese (Mn), % 1.2 to 2.0
0
Molybdenum (Mo), % 2.5 to 3.0
4.5 to 6.0
Nickel (Ni), % 4.5 to 5.2
2.0 to 3.0
Nitrogen (N), % 0.050 to 0.1
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 1.4 to 2.0
0 to 1.5
Sulfur (S), % 0 to 0.015
0