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AISI 418 Stainless Steel vs. Grade CW6MC Nickel

AISI 418 stainless steel belongs to the iron alloys classification, while grade CW6MC nickel belongs to the nickel alloys. There are 29 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 AISI 418 stainless steel and the bottom bar is grade CW6MC nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 17
28
Fatigue Strength, MPa 520
210
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
79
Tensile Strength: Ultimate (UTS), MPa 1100
540
Tensile Strength: Yield (Proof), MPa 850
310

Thermal Properties

Latent Heat of Fusion, J/g 270
330
Maximum Temperature: Mechanical, °C 770
980
Melting Completion (Liquidus), °C 1500
1480
Melting Onset (Solidus), °C 1460
1430
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 25
11
Thermal Expansion, µm/m-K 10
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
1.3
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
1.4

Otherwise Unclassified Properties

Base Metal Price, % relative 15
80
Density, g/cm3 8.0
8.6
Embodied Carbon, kg CO2/kg material 2.9
14
Embodied Energy, MJ/kg 41
200
Embodied Water, L/kg 110
290

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
130
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
240
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
23
Strength to Weight: Axial, points 38
18
Strength to Weight: Bending, points 29
17
Thermal Diffusivity, mm2/s 6.7
2.8
Thermal Shock Resistance, points 40
15

Alloy Composition

Carbon (C), % 0.15 to 0.2
0 to 0.060
Chromium (Cr), % 12 to 14
20 to 23
Iron (Fe), % 78.5 to 83.6
0 to 5.0
Manganese (Mn), % 0 to 0.5
0 to 1.0
Molybdenum (Mo), % 0 to 0.5
8.0 to 10
Nickel (Ni), % 1.8 to 2.2
55.4 to 68.9
Niobium (Nb), % 0
3.2 to 4.5
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 2.5 to 3.5
0