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Nickel 725 vs. SAE-AISI O2 Steel

Nickel 725 belongs to the nickel alloys classification, while SAE-AISI O2 steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is nickel 725 and the bottom bar is SAE-AISI O2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
72
Tensile Strength: Ultimate (UTS), MPa 860
640 to 2050

Thermal Properties

Latent Heat of Fusion, J/g 320
250
Melting Completion (Liquidus), °C 1340
1450
Melting Onset (Solidus), °C 1270
1410
Specific Heat Capacity, J/kg-K 440
470
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.5
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.6
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 75
2.4
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 13
1.8
Embodied Energy, MJ/kg 190
26
Embodied Water, L/kg 270
50

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 28
23 to 73
Strength to Weight: Bending, points 24
21 to 46
Thermal Shock Resistance, points 23
22 to 70

Alloy Composition

Aluminum (Al), % 0 to 0.35
0
Carbon (C), % 0 to 0.030
0.85 to 1.0
Chromium (Cr), % 19 to 22.5
0 to 0.5
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 2.3 to 15.3
95 to 97.8
Manganese (Mn), % 0 to 0.35
1.4 to 1.8
Molybdenum (Mo), % 7.0 to 9.5
0 to 0.3
Nickel (Ni), % 55 to 59
0 to 0.3
Niobium (Nb), % 2.8 to 4.0
0
Phosphorus (P), % 0 to 0.015
0 to 0.030
Silicon (Si), % 0 to 0.2
0 to 0.5
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 1.0 to 1.7
0
Vanadium (V), % 0
0 to 0.3