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R30021 Cobalt vs. EN 1.4874 Stainless Steel

R30021 cobalt belongs to the cobalt alloys classification, while EN 1.4874 stainless steel belongs to the iron alloys. They have 48% of their average alloy composition in common. 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 1.4874 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 9.0
6.7
Fatigue Strength, MPa 250
180
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 700
480
Tensile Strength: Yield (Proof), MPa 500
360

Thermal Properties

Latent Heat of Fusion, J/g 330
300
Melting Completion (Liquidus), °C 1350
1450
Melting Onset (Solidus), °C 1190
1400
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 15
13
Thermal Expansion, µm/m-K 11
15

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 8.0
7.6
Embodied Energy, MJ/kg 110
110
Embodied Water, L/kg 520
290

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 57
29
Resilience: Unit (Modulus of Resilience), kJ/m3 570
310
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 23
16
Strength to Weight: Bending, points 21
16
Thermal Diffusivity, mm2/s 3.8
3.3
Thermal Shock Resistance, points 21
11

Alloy Composition

Carbon (C), % 0.2 to 0.35
0.35 to 0.65
Chromium (Cr), % 26 to 29
19 to 22
Cobalt (Co), % 61.7 to 67.3
18.5 to 22
Iron (Fe), % 0 to 3.0
23 to 38.9
Manganese (Mn), % 0
0 to 2.0
Molybdenum (Mo), % 4.5 to 6.0
2.5 to 3.0
Nickel (Ni), % 2.0 to 3.0
18 to 22
Niobium (Nb), % 0
0.75 to 1.3
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
2.0 to 3.0