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Nickel 725 vs. SAE-AISI 4718 Steel

Nickel 725 belongs to the nickel alloys classification, while SAE-AISI 4718 steel belongs to the iron alloys. There are 28 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 725 and the bottom bar is SAE-AISI 4718 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34
24
Fatigue Strength, MPa 260
270
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
73
Shear Strength, MPa 580
330
Tensile Strength: Ultimate (UTS), MPa 860
510
Tensile Strength: Yield (Proof), MPa 350
370

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Maximum Temperature: Mechanical, °C 980
420
Melting Completion (Liquidus), °C 1340
1460
Melting Onset (Solidus), °C 1270
1420
Specific Heat Capacity, J/kg-K 440
470
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.5
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 1.6
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 75
3.0
Density, g/cm3 8.5
7.9
Embodied Carbon, kg CO2/kg material 13
1.6
Embodied Energy, MJ/kg 190
21
Embodied Water, L/kg 270
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
110
Resilience: Unit (Modulus of Resilience), kJ/m3 300
360
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
18
Strength to Weight: Bending, points 24
18
Thermal Shock Resistance, points 23
17

Alloy Composition

Aluminum (Al), % 0 to 0.35
0
Carbon (C), % 0 to 0.030
0.16 to 0.21
Chromium (Cr), % 19 to 22.5
0.35 to 0.55
Iron (Fe), % 2.3 to 15.3
96.3 to 97.4
Manganese (Mn), % 0 to 0.35
0.7 to 0.9
Molybdenum (Mo), % 7.0 to 9.5
0.3 to 0.4
Nickel (Ni), % 55 to 59
0.9 to 1.2
Niobium (Nb), % 2.8 to 4.0
0
Phosphorus (P), % 0 to 0.015
0 to 0.035
Silicon (Si), % 0 to 0.2
0.15 to 0.35
Sulfur (S), % 0 to 0.010
0 to 0.040
Titanium (Ti), % 1.0 to 1.7
0