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EN 1.4938 +A Steel vs. Annealed R31539 Cobalt

EN 1.4938 +A steel belongs to the iron alloys classification, while annealed R31539 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is EN 1.4938 +A steel and the bottom bar is annealed R31539 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 17
22
Fatigue Strength, MPa 390
310
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
86
Tensile Strength: Ultimate (UTS), MPa 870
1000
Tensile Strength: Yield (Proof), MPa 640
590

Thermal Properties

Latent Heat of Fusion, J/g 270
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 30
13
Thermal Expansion, µm/m-K 11
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 3.3
8.2
Embodied Energy, MJ/kg 47
110
Embodied Water, L/kg 110
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
190
Resilience: Unit (Modulus of Resilience), kJ/m3 1050
780
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 31
33
Strength to Weight: Bending, points 26
27
Thermal Diffusivity, mm2/s 8.1
3.5
Thermal Shock Resistance, points 30
24

Alloy Composition

Aluminum (Al), % 0
0.3 to 1.0
Carbon (C), % 0.080 to 0.15
0 to 0.14
Chromium (Cr), % 11 to 12.5
26 to 30
Cobalt (Co), % 0
57.7 to 68.7
Iron (Fe), % 80.5 to 84.8
0 to 0.75
Lanthanum (La), % 0
0.030 to 0.2
Manganese (Mn), % 0.4 to 0.9
0 to 1.0
Molybdenum (Mo), % 1.5 to 2.0
5.0 to 7.0
Nickel (Ni), % 2.0 to 3.0
0 to 1.0
Nitrogen (N), % 0.020 to 0.040
0 to 0.25
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.015
0
Vanadium (V), % 0.25 to 0.4
0