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Nickel 22 vs. AISI 418 Stainless Steel

Nickel 22 belongs to the nickel alloys classification, while AISI 418 stainless steel belongs to the iron alloys. They have a modest 22% 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 (4, in this case) are not shown.

For each property being compared, the top bar is nickel 22 and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 49
17
Fatigue Strength, MPa 330
520
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 84
77
Shear Strength, MPa 560
680
Tensile Strength: Ultimate (UTS), MPa 790
1100
Tensile Strength: Yield (Proof), MPa 360
850

Thermal Properties

Latent Heat of Fusion, J/g 320
270
Maximum Temperature: Mechanical, °C 990
770
Melting Completion (Liquidus), °C 1390
1500
Melting Onset (Solidus), °C 1360
1460
Specific Heat Capacity, J/kg-K 430
470
Thermal Conductivity, W/m-K 10
25
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.5
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 1.5
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 70
15
Density, g/cm3 8.9
8.0
Embodied Carbon, kg CO2/kg material 12
2.9
Embodied Energy, MJ/kg 170
41
Embodied Water, L/kg 300
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 320
170
Resilience: Unit (Modulus of Resilience), kJ/m3 300
1830
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 25
38
Strength to Weight: Bending, points 21
29
Thermal Diffusivity, mm2/s 2.7
6.7
Thermal Shock Resistance, points 24
40

Alloy Composition

Carbon (C), % 0 to 0.015
0.15 to 0.2
Chromium (Cr), % 20 to 22.5
12 to 14
Cobalt (Co), % 0 to 2.5
0
Iron (Fe), % 2.0 to 6.0
78.5 to 83.6
Manganese (Mn), % 0 to 0.015
0 to 0.5
Molybdenum (Mo), % 12.5 to 14.5
0 to 0.5
Nickel (Ni), % 50.8 to 63
1.8 to 2.2
Phosphorus (P), % 0 to 0.020
0 to 0.040
Silicon (Si), % 0 to 0.080
0 to 0.5
Sulfur (S), % 0 to 0.020
0 to 0.030
Tungsten (W), % 2.5 to 3.5
2.5 to 3.5
Vanadium (V), % 0 to 0.35
0