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EN 1.4310 Stainless Steel vs. R31538 Cobalt

EN 1.4310 stainless steel belongs to the iron alloys classification, while R31538 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 1.4310 stainless steel and the bottom bar is R31538 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
220
Elongation at Break, % 14 to 45
13 to 23
Fatigue Strength, MPa 240 to 330
310 to 480
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
86
Tensile Strength: Ultimate (UTS), MPa 730 to 900
1020 to 1360
Tensile Strength: Yield (Proof), MPa 260 to 570
580 to 930

Thermal Properties

Latent Heat of Fusion, J/g 290
320
Melting Completion (Liquidus), °C 1420
1360
Melting Onset (Solidus), °C 1380
1290
Specific Heat Capacity, J/kg-K 480
450
Thermal Conductivity, W/m-K 15
13
Thermal Expansion, µm/m-K 18
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
2.1

Otherwise Unclassified Properties

Density, g/cm3 7.8
8.4
Embodied Carbon, kg CO2/kg material 2.9
8.1
Embodied Energy, MJ/kg 42
110
Embodied Water, L/kg 140
530

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 260
140 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 170 to 830
750 to 1920
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
24
Strength to Weight: Axial, points 26 to 32
34 to 45
Strength to Weight: Bending, points 23 to 27
27 to 32
Thermal Diffusivity, mm2/s 4.0
3.5
Thermal Shock Resistance, points 15 to 18
25 to 33

Alloy Composition

Carbon (C), % 0.050 to 0.15
0.15 to 0.35
Chromium (Cr), % 16 to 19
26 to 30
Cobalt (Co), % 0
58.7 to 68.9
Iron (Fe), % 66.4 to 78
0 to 0.75
Manganese (Mn), % 0 to 2.0
0 to 1.0
Molybdenum (Mo), % 0 to 0.8
5.0 to 7.0
Nickel (Ni), % 6.0 to 9.5
0 to 1.0
Nitrogen (N), % 0 to 0.1
0 to 0.25
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 2.0
0 to 1.0
Sulfur (S), % 0 to 0.015
0