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R30021 Cobalt vs. EN 1.4849 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while EN 1.4849 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 R30021 cobalt and the bottom bar is EN 1.4849 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 9.0
4.5
Fatigue Strength, MPa 250
120
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 86
75
Tensile Strength: Ultimate (UTS), MPa 700
480
Tensile Strength: Yield (Proof), MPa 500
250

Thermal Properties

Latent Heat of Fusion, J/g 330
320
Melting Completion (Liquidus), °C 1350
1390
Melting Onset (Solidus), °C 1190
1340
Specific Heat Capacity, J/kg-K 450
480
Thermal Conductivity, W/m-K 15
12
Thermal Expansion, µm/m-K 11
15

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.0
Embodied Carbon, kg CO2/kg material 8.0
7.1
Embodied Energy, MJ/kg 110
100
Embodied Water, L/kg 520
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
18
Resilience: Unit (Modulus of Resilience), kJ/m3 570
160
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
17
Strength to Weight: Bending, points 21
17
Thermal Diffusivity, mm2/s 3.8
3.2
Thermal Shock Resistance, points 21
11

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.3 to 0.5
Chromium (Cr), % 26 to 29
18 to 21
Cobalt (Co), % 61.7 to 67.3
0
Iron (Fe), % 0 to 3.0
32.6 to 43.5
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 4.5 to 6.0
0 to 0.5
Nickel (Ni), % 2.0 to 3.0
36 to 39
Niobium (Nb), % 0
1.2 to 1.8
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
1.0 to 2.5
Sulfur (S), % 0
0 to 0.030