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R31538 Cobalt vs. EN 1.4971 Stainless Steel

R31538 cobalt belongs to the cobalt alloys classification, while EN 1.4971 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 (10, in this case) are not shown.

For each property being compared, the top bar is R31538 cobalt and the bottom bar is EN 1.4971 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
210
Elongation at Break, % 13 to 23
34
Fatigue Strength, MPa 310 to 480
270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 86
81
Tensile Strength: Ultimate (UTS), MPa 1020 to 1360
800
Tensile Strength: Yield (Proof), MPa 580 to 930
340

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Melting Completion (Liquidus), °C 1360
1460
Melting Onset (Solidus), °C 1290
1410
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
300

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 200
220
Resilience: Unit (Modulus of Resilience), kJ/m3 750 to 1920
280
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 34 to 45
26
Strength to Weight: Bending, points 27 to 32
23
Thermal Diffusivity, mm2/s 3.5
3.4
Thermal Shock Resistance, points 25 to 33
19

Alloy Composition

Carbon (C), % 0.15 to 0.35
0.080 to 0.16
Chromium (Cr), % 26 to 30
20 to 22.5
Cobalt (Co), % 58.7 to 68.9
18.5 to 21
Iron (Fe), % 0 to 0.75
24.3 to 37.1
Manganese (Mn), % 0 to 1.0
0 to 2.0
Molybdenum (Mo), % 5.0 to 7.0
2.5 to 3.5
Nickel (Ni), % 0 to 1.0
19 to 21
Niobium (Nb), % 0
0.75 to 1.3
Nitrogen (N), % 0 to 0.25
0.1 to 0.2
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 1.0
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Tungsten (W), % 0
2.0 to 3.0