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Monel 400 vs. S81921 Stainless Steel

Monel 400 belongs to the nickel alloys classification, while S81921 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is Monel 400 and the bottom bar is S81921 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 160
200
Elongation at Break, % 20 to 40
29
Fatigue Strength, MPa 230 to 290
370
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 62
79
Shear Strength, MPa 370 to 490
460
Tensile Strength: Ultimate (UTS), MPa 540 to 780
710
Tensile Strength: Yield (Proof), MPa 210 to 590
500

Thermal Properties

Latent Heat of Fusion, J/g 270
290
Maximum Temperature: Mechanical, °C 1000
990
Melting Completion (Liquidus), °C 1350
1430
Melting Onset (Solidus), °C 1300
1390
Specific Heat Capacity, J/kg-K 430
480
Thermal Conductivity, W/m-K 23
15
Thermal Expansion, µm/m-K 14
13

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
14
Density, g/cm3 8.9
7.7
Embodied Carbon, kg CO2/kg material 7.9
2.9
Embodied Energy, MJ/kg 110
41
Embodied Water, L/kg 250
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140 to 180
180
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 1080
630
Stiffness to Weight: Axial, points 10
14
Stiffness to Weight: Bending, points 21
25
Strength to Weight: Axial, points 17 to 25
25
Strength to Weight: Bending, points 17 to 21
23
Thermal Diffusivity, mm2/s 6.1
4.0
Thermal Shock Resistance, points 17 to 25
20

Alloy Composition

Carbon (C), % 0 to 0.3
0 to 0.030
Chromium (Cr), % 0
19 to 22
Copper (Cu), % 28 to 34
0
Iron (Fe), % 0 to 2.5
66.7 to 75.9
Manganese (Mn), % 0 to 2.0
2.0 to 4.0
Molybdenum (Mo), % 0
1.0 to 2.0
Nickel (Ni), % 63 to 72
2.0 to 4.0
Nitrogen (N), % 0
0.14 to 0.2
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.024
0 to 0.030