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Nickel 725 vs. AISI 440A Stainless Steel

Nickel 725 belongs to the nickel alloys classification, while AISI 440A stainless steel belongs to the iron alloys. They have a modest 26% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is nickel 725 and the bottom bar is AISI 440A stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
5.0 to 20
Fatigue Strength, MPa 260
270 to 790
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 78
77
Shear Strength, MPa 580
450 to 1040
Tensile Strength: Ultimate (UTS), MPa 860
730 to 1790
Tensile Strength: Yield (Proof), MPa 350
420 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 320
280
Maximum Temperature: Mechanical, °C 980
760
Melting Completion (Liquidus), °C 1340
1480
Melting Onset (Solidus), °C 1270
1370
Specific Heat Capacity, J/kg-K 440
480
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.5
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 1.6
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 75
9.0
Density, g/cm3 8.5
7.7
Embodied Carbon, kg CO2/kg material 13
2.2
Embodied Energy, MJ/kg 190
31
Embodied Water, L/kg 270
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
87 to 120
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
26 to 65
Strength to Weight: Bending, points 24
23 to 43
Thermal Shock Resistance, points 23
26 to 65

Alloy Composition

Aluminum (Al), % 0 to 0.35
0
Carbon (C), % 0 to 0.030
0.6 to 0.75
Chromium (Cr), % 19 to 22.5
16 to 18
Iron (Fe), % 2.3 to 15.3
78.4 to 83.4
Manganese (Mn), % 0 to 0.35
0 to 1.0
Molybdenum (Mo), % 7.0 to 9.5
0 to 0.75
Nickel (Ni), % 55 to 59
0
Niobium (Nb), % 2.8 to 4.0
0
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 0.2
0 to 1.0
Sulfur (S), % 0 to 0.010
0 to 0.015
Titanium (Ti), % 1.0 to 1.7
0