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Monel 400 vs. S31266 Stainless Steel

Monel 400 belongs to the nickel alloys classification, while S31266 stainless steel belongs to the iron alloys. They have a modest 27% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is Monel 400 and the bottom bar is S31266 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 160
210
Elongation at Break, % 20 to 40
40
Fatigue Strength, MPa 230 to 290
400
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 62
81
Shear Strength, MPa 370 to 490
590
Tensile Strength: Ultimate (UTS), MPa 540 to 780
860
Tensile Strength: Yield (Proof), MPa 210 to 590
470

Thermal Properties

Latent Heat of Fusion, J/g 270
310
Maximum Temperature: Mechanical, °C 1000
1100
Melting Completion (Liquidus), °C 1350
1470
Melting Onset (Solidus), °C 1300
1420
Specific Heat Capacity, J/kg-K 430
460
Thermal Conductivity, W/m-K 23
12
Thermal Expansion, µm/m-K 14
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.3
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 50
37
Density, g/cm3 8.9
8.2
Embodied Carbon, kg CO2/kg material 7.9
6.5
Embodied Energy, MJ/kg 110
89
Embodied Water, L/kg 250
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 180
290
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 1080
540
Stiffness to Weight: Axial, points 10
14
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 17 to 25
29
Strength to Weight: Bending, points 17 to 21
24
Thermal Diffusivity, mm2/s 6.1
3.1
Thermal Shock Resistance, points 17 to 25
18

Alloy Composition

Carbon (C), % 0 to 0.3
0 to 0.030
Chromium (Cr), % 0
23 to 25
Copper (Cu), % 28 to 34
1.0 to 2.5
Iron (Fe), % 0 to 2.5
34.1 to 46
Manganese (Mn), % 0 to 2.0
2.0 to 4.0
Molybdenum (Mo), % 0
5.2 to 6.2
Nickel (Ni), % 63 to 72
21 to 24
Nitrogen (N), % 0
0.35 to 0.6
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.024
0 to 0.020
Tungsten (W), % 0
1.5 to 2.5