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R30021 Cobalt vs. EN 1.4749 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while EN 1.4749 stainless steel belongs to the iron alloys. They have a modest 30% 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 R30021 cobalt and the bottom bar is EN 1.4749 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 9.0
16
Fatigue Strength, MPa 250
190
Poisson's Ratio 0.29
0.27
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 700
600
Tensile Strength: Yield (Proof), MPa 500
320

Thermal Properties

Latent Heat of Fusion, J/g 330
300
Melting Completion (Liquidus), °C 1350
1420
Melting Onset (Solidus), °C 1190
1380
Specific Heat Capacity, J/kg-K 450
490
Thermal Conductivity, W/m-K 15
17
Thermal Expansion, µm/m-K 11
9.6

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.9
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
2.9

Otherwise Unclassified Properties

Density, g/cm3 8.4
7.6
Embodied Carbon, kg CO2/kg material 8.0
2.5
Embodied Energy, MJ/kg 110
36
Embodied Water, L/kg 520
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
80
Resilience: Unit (Modulus of Resilience), kJ/m3 570
250
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 24
26
Strength to Weight: Axial, points 23
22
Strength to Weight: Bending, points 21
21
Thermal Diffusivity, mm2/s 3.8
4.6
Thermal Shock Resistance, points 21
22

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.15 to 0.2
Chromium (Cr), % 26 to 29
26 to 29
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
68.5 to 73.7
Manganese (Mn), % 0
0 to 1.0
Molybdenum (Mo), % 4.5 to 6.0
0
Nickel (Ni), % 2.0 to 3.0
0
Nitrogen (N), % 0
0.15 to 0.25
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.015