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EN 1.7390 Steel vs. R31538 Cobalt

EN 1.7390 steel belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

For each property being compared, the top bar is EN 1.7390 steel and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
220
Elongation at Break, % 16
13 to 23
Fatigue Strength, MPa 310
310 to 480
Poisson's Ratio 0.29
0.29
Reduction in Area, % 50
13 to 22
Shear Modulus, GPa 74
86
Tensile Strength: Ultimate (UTS), MPa 710
1020 to 1360
Tensile Strength: Yield (Proof), MPa 480
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 260
320
Melting Completion (Liquidus), °C 1460
1360
Melting Onset (Solidus), °C 1420
1290
Specific Heat Capacity, J/kg-K 470
450
Thermal Conductivity, W/m-K 40
13
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.1
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 9.3
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 1.7
8.1
Embodied Energy, MJ/kg 23
110
Embodied Water, L/kg 69
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 600
750 to 1920
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 25
34 to 45
Strength to Weight: Bending, points 23
27 to 32
Thermal Diffusivity, mm2/s 11
3.5
Thermal Shock Resistance, points 20
25 to 33

Alloy Composition

Carbon (C), % 0 to 0.18
0.15 to 0.35
Chromium (Cr), % 4.0 to 6.0
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Iron (Fe), % 91.9 to 95.3
0 to 0.75
Manganese (Mn), % 0.3 to 0.8
0 to 1.0
Molybdenum (Mo), % 0.45 to 0.65
5.0 to 7.0
Nickel (Ni), % 0
0 to 1.0
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0 to 0.015
0