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Monel 400 vs. AISI 384 Stainless Steel

Monel 400 belongs to the nickel alloys classification, while AISI 384 stainless steel belongs to the iron alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is Monel 400 and the bottom bar is AISI 384 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 160
200
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 62
76
Tensile Strength: Ultimate (UTS), MPa 540 to 780
480

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Mechanical, °C 1000
910
Melting Completion (Liquidus), °C 1350
1420
Melting Onset (Solidus), °C 1300
1380
Specific Heat Capacity, J/kg-K 430
480
Thermal Conductivity, W/m-K 23
16
Thermal Expansion, µm/m-K 14
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.3
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 50
20
Density, g/cm3 8.9
7.9
Embodied Carbon, kg CO2/kg material 7.9
3.7
Embodied Energy, MJ/kg 110
52
Embodied Water, L/kg 250
150

Common Calculations

Stiffness to Weight: Axial, points 10
14
Stiffness to Weight: Bending, points 21
24
Strength to Weight: Axial, points 17 to 25
17
Strength to Weight: Bending, points 17 to 21
17
Thermal Diffusivity, mm2/s 6.1
4.3
Thermal Shock Resistance, points 17 to 25
11

Alloy Composition

Carbon (C), % 0 to 0.3
0 to 0.040
Chromium (Cr), % 0
15 to 17
Copper (Cu), % 28 to 34
0
Iron (Fe), % 0 to 2.5
60.9 to 68
Manganese (Mn), % 0 to 2.0
0 to 2.0
Nickel (Ni), % 63 to 72
17 to 19
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.024
0 to 0.030