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Nickel 725 vs. ACI-ASTM CB7Cu-1 Steel

Nickel 725 belongs to the nickel alloys classification, while ACI-ASTM CB7Cu-1 steel belongs to the iron alloys. They have a modest 30% of their average alloy composition in common, which, by itself, doesn't mean much. There are 26 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is nickel 725 and the bottom bar is ACI-ASTM CB7Cu-1 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Elongation at Break, % 34
5.7 to 11
Fatigue Strength, MPa 260
420 to 590
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 78
76
Tensile Strength: Ultimate (UTS), MPa 860
960 to 1350
Tensile Strength: Yield (Proof), MPa 350
760 to 1180

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Melting Completion (Liquidus), °C 1340
1430
Melting Onset (Solidus), °C 1270
1500
Specific Heat Capacity, J/kg-K 440
480
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.5
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.6
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 75
13
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 13
2.6
Embodied Energy, MJ/kg 190
38
Embodied Water, L/kg 270
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 300
1500 to 3590
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
34 to 48
Strength to Weight: Bending, points 24
28 to 35
Thermal Shock Resistance, points 23
32 to 45

Alloy Composition

Aluminum (Al), % 0 to 0.35
0
Carbon (C), % 0 to 0.030
0 to 0.070
Chromium (Cr), % 19 to 22.5
15.5 to 17.7
Copper (Cu), % 0
2.5 to 3.2
Iron (Fe), % 2.3 to 15.3
72.3 to 78.4
Manganese (Mn), % 0 to 0.35
0 to 0.7
Molybdenum (Mo), % 7.0 to 9.5
0
Nickel (Ni), % 55 to 59
3.6 to 4.6
Niobium (Nb), % 2.8 to 4.0
0 to 0.35
Nitrogen (N), % 0
0 to 0.050
Phosphorus (P), % 0 to 0.015
0 to 0.035
Silicon (Si), % 0 to 0.2
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.030
Titanium (Ti), % 1.0 to 1.7
0