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Monel 400 vs. AISI 321 Stainless Steel

Monel 400 belongs to the nickel alloys classification, while AISI 321 stainless steel belongs to the iron alloys. 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 AISI 321 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 160
200
Elongation at Break, % 20 to 40
34 to 50
Fatigue Strength, MPa 230 to 290
220 to 270
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 62
77
Shear Strength, MPa 370 to 490
420 to 460
Tensile Strength: Ultimate (UTS), MPa 540 to 780
590 to 690
Tensile Strength: Yield (Proof), MPa 210 to 590
220 to 350

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Mechanical, °C 1000
870
Melting Completion (Liquidus), °C 1350
1430
Melting Onset (Solidus), °C 1300
1400
Specific Heat Capacity, J/kg-K 430
480
Thermal Conductivity, W/m-K 23
16
Thermal Expansion, µm/m-K 14
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 3.3
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 3.4
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 50
16
Density, g/cm3 8.9
7.8
Embodied Carbon, kg CO2/kg material 7.9
3.2
Embodied Energy, MJ/kg 110
45
Embodied Water, L/kg 250
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 180
190 to 230
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 1080
130 to 310
Stiffness to Weight: Axial, points 10
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 17 to 25
21 to 25
Strength to Weight: Bending, points 17 to 21
20 to 22
Thermal Diffusivity, mm2/s 6.1
4.1
Thermal Shock Resistance, points 17 to 25
13 to 15

Alloy Composition

Carbon (C), % 0 to 0.3
0 to 0.080
Chromium (Cr), % 0
17 to 19
Copper (Cu), % 28 to 34
0
Iron (Fe), % 0 to 2.5
65.3 to 74
Manganese (Mn), % 0 to 2.0
0 to 2.0
Nickel (Ni), % 63 to 72
9.0 to 12
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.5
0 to 0.75
Sulfur (S), % 0 to 0.024
0 to 0.030
Titanium (Ti), % 0
0 to 0.7

Comparable Variants