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EN 1.4477 Stainless Steel vs. R30021 Cobalt

EN 1.4477 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 34% 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 1.4477 stainless steel and the bottom bar is R30021 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
220
Elongation at Break, % 22 to 23
9.0
Fatigue Strength, MPa 420 to 490
250
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 81
86
Tensile Strength: Ultimate (UTS), MPa 880 to 930
700
Tensile Strength: Yield (Proof), MPa 620 to 730
500

Thermal Properties

Latent Heat of Fusion, J/g 300
330
Melting Completion (Liquidus), °C 1430
1350
Melting Onset (Solidus), °C 1380
1190
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 13
15
Thermal Expansion, µm/m-K 13
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 3.7
8.0
Embodied Energy, MJ/kg 52
110
Embodied Water, L/kg 190
520

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180 to 190
57
Resilience: Unit (Modulus of Resilience), kJ/m3 940 to 1290
570
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 31 to 33
23
Strength to Weight: Bending, points 26 to 27
21
Thermal Diffusivity, mm2/s 3.5
3.8
Thermal Shock Resistance, points 23 to 25
21

Alloy Composition

Carbon (C), % 0 to 0.030
0.2 to 0.35
Chromium (Cr), % 28 to 30
26 to 29
Cobalt (Co), % 0
61.7 to 67.3
Copper (Cu), % 0 to 0.8
0
Iron (Fe), % 56.6 to 63.6
0 to 3.0
Manganese (Mn), % 0.8 to 1.5
0
Molybdenum (Mo), % 1.5 to 2.6
4.5 to 6.0
Nickel (Ni), % 5.8 to 7.5
2.0 to 3.0
Nitrogen (N), % 0.3 to 0.4
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0 to 1.5
Sulfur (S), % 0 to 0.015
0