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Grade CY40 Nickel vs. SAE-AISI 8640 Steel

Grade CY40 nickel belongs to the nickel alloys classification, while SAE-AISI 8640 steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.

For each property being compared, the top bar is grade CY40 nickel and the bottom bar is SAE-AISI 8640 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 34
23
Fatigue Strength, MPa 160
270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 74
73
Tensile Strength: Ultimate (UTS), MPa 540
570
Tensile Strength: Yield (Proof), MPa 220
380

Thermal Properties

Latent Heat of Fusion, J/g 330
250
Maximum Temperature: Mechanical, °C 960
410
Melting Completion (Liquidus), °C 1350
1460
Melting Onset (Solidus), °C 1300
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 14
39
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.8
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 55
2.6
Density, g/cm3 8.4
7.8
Embodied Carbon, kg CO2/kg material 9.1
1.5
Embodied Energy, MJ/kg 130
20
Embodied Water, L/kg 260
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
120
Resilience: Unit (Modulus of Resilience), kJ/m3 130
380
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 18
20
Strength to Weight: Bending, points 18
20
Thermal Diffusivity, mm2/s 3.7
10
Thermal Shock Resistance, points 16
17

Alloy Composition

Carbon (C), % 0 to 0.4
0.38 to 0.43
Chromium (Cr), % 14 to 17
0.4 to 0.6
Iron (Fe), % 0 to 11
96.6 to 97.8
Manganese (Mn), % 0 to 1.5
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 67 to 86
0.4 to 0.7
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0 to 3.0
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040