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R31233 Cobalt vs. EN 1.4903 Stainless Steel

R31233 cobalt belongs to the cobalt alloys classification, while EN 1.4903 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is R31233 cobalt and the bottom bar is EN 1.4903 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
190
Elongation at Break, % 17
20 to 21
Fatigue Strength, MPa 220
320 to 330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 85
75
Tensile Strength: Ultimate (UTS), MPa 1020
670 to 680
Tensile Strength: Yield (Proof), MPa 420
500

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Melting Completion (Liquidus), °C 1350
1460
Melting Onset (Solidus), °C 1330
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 12
26
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
3.4
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
4.0

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.8
Embodied Carbon, kg CO2/kg material 8.4
2.6
Embodied Energy, MJ/kg 110
36
Embodied Water, L/kg 480
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
120 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 410
650
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 33
24
Strength to Weight: Bending, points 26
22
Thermal Diffusivity, mm2/s 3.2
7.0
Thermal Shock Resistance, points 25
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.040
Boron (B), % 0 to 0.015
0
Carbon (C), % 0.020 to 0.1
0.080 to 0.12
Chromium (Cr), % 23.5 to 27.5
8.0 to 9.5
Cobalt (Co), % 44.7 to 63.3
0
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 1.0 to 5.0
87.1 to 90.5
Manganese (Mn), % 0.1 to 1.5
0.3 to 0.6
Molybdenum (Mo), % 4.0 to 6.0
0.85 to 1.1
Nickel (Ni), % 7.0 to 11
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0.030 to 0.12
0.030 to 0.070
Phosphorus (P), % 0 to 0.030
0 to 0.025
Silicon (Si), % 0.050 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.015
Tungsten (W), % 1.0 to 3.0
0
Vanadium (V), % 0
0.18 to 0.25