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R31538 Cobalt vs. EN 1.4874 Stainless Steel

R31538 cobalt belongs to the cobalt alloys classification, while EN 1.4874 stainless steel belongs to the iron alloys. They have 46% 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 R31538 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, % 13 to 23
6.7
Fatigue Strength, MPa 310 to 480
180
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
80
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
480
Tensile Strength: Yield (Proof), MPa 580 to 930
360

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1450
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
450
Thermal Conductivity, W/m-K 13
13
Thermal Expansion, µm/m-K 13
15

Otherwise Unclassified Properties

Density, g/cm3 8.4
8.4
Embodied Carbon, kg CO2/kg material 8.1
7.6
Embodied Energy, MJ/kg 110
110
Embodied Water, L/kg 530
290

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
29
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
310
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
16
Strength to Weight: Bending, points 27 to 32
16
Thermal Diffusivity, mm2/s 3.5
3.3
Thermal Shock Resistance, points 25 to 33
11

Alloy Composition

Carbon (C), % 0.15 to 0.35
0.35 to 0.65
Chromium (Cr), % 26 to 30
19 to 22
Cobalt (Co), % 58.7 to 68.9
18.5 to 22
Iron (Fe), % 0 to 0.75
23 to 38.9
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
2.5 to 3.0
Nickel (Ni), % 0 to 1.0
18 to 22
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
2.0 to 3.0