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EN 1.1221 Steel vs. R31233 Cobalt

EN 1.1221 steel belongs to the iron alloys classification, while R31233 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is EN 1.1221 steel and the bottom bar is R31233 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 10 to 21
17
Fatigue Strength, MPa 240 to 340
220
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
85
Tensile Strength: Ultimate (UTS), MPa 730 to 870
1020
Tensile Strength: Yield (Proof), MPa 390 to 550
420

Thermal Properties

Latent Heat of Fusion, J/g 250
320
Melting Completion (Liquidus), °C 1460
1350
Melting Onset (Solidus), °C 1410
1330
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 48
12
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.6
Embodied Carbon, kg CO2/kg material 1.5
8.4
Embodied Energy, MJ/kg 19
110
Embodied Water, L/kg 47
480

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 67 to 130
140
Resilience: Unit (Modulus of Resilience), kJ/m3 410 to 800
410
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 26 to 31
33
Strength to Weight: Bending, points 23 to 26
26
Thermal Diffusivity, mm2/s 13
3.2
Thermal Shock Resistance, points 23 to 28
25

Alloy Composition

Boron (B), % 0
0 to 0.015
Carbon (C), % 0.57 to 0.65
0.020 to 0.1
Chromium (Cr), % 0 to 0.4
23.5 to 27.5
Cobalt (Co), % 0
44.7 to 63.3
Iron (Fe), % 97.1 to 98.8
1.0 to 5.0
Manganese (Mn), % 0.6 to 0.9
0.1 to 1.5
Molybdenum (Mo), % 0 to 0.1
4.0 to 6.0
Nickel (Ni), % 0 to 0.4
7.0 to 11
Nitrogen (N), % 0
0.030 to 0.12
Phosphorus (P), % 0 to 0.035
0 to 0.030
Silicon (Si), % 0 to 0.4
0.050 to 1.0
Sulfur (S), % 0 to 0.035
0 to 0.020
Tungsten (W), % 0
1.0 to 3.0