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Nickel 725 vs. S44800 Stainless Steel

Nickel 725 belongs to the nickel alloys classification, while S44800 stainless steel belongs to the iron alloys. They have a modest 36% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 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 S44800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
210
Elongation at Break, % 34
23
Fatigue Strength, MPa 260
300
Poisson's Ratio 0.29
0.27
Reduction in Area, % 45
45
Shear Modulus, GPa 78
82
Shear Strength, MPa 580
370
Tensile Strength: Ultimate (UTS), MPa 860
590
Tensile Strength: Yield (Proof), MPa 350
450

Thermal Properties

Latent Heat of Fusion, J/g 320
300
Maximum Temperature: Mechanical, °C 980
1100
Melting Completion (Liquidus), °C 1340
1460
Melting Onset (Solidus), °C 1270
1410
Specific Heat Capacity, J/kg-K 440
480
Thermal Expansion, µm/m-K 13
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.5
2.6
Electrical Conductivity: Equal Weight (Specific), % IACS 1.6
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 75
19
Density, g/cm3 8.5
7.8
Embodied Carbon, kg CO2/kg material 13
3.8
Embodied Energy, MJ/kg 190
52
Embodied Water, L/kg 270
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
120
Resilience: Unit (Modulus of Resilience), kJ/m3 300
480
Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
21
Strength to Weight: Bending, points 24
20
Thermal Shock Resistance, points 23
19

Alloy Composition

Aluminum (Al), % 0 to 0.35
0
Carbon (C), % 0 to 0.030
0 to 0.010
Chromium (Cr), % 19 to 22.5
28 to 30
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 2.3 to 15.3
62.6 to 66.5
Manganese (Mn), % 0 to 0.35
0 to 0.3
Molybdenum (Mo), % 7.0 to 9.5
3.5 to 4.2
Nickel (Ni), % 55 to 59
2.0 to 2.5
Niobium (Nb), % 2.8 to 4.0
0
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0 to 0.015
0 to 0.025
Silicon (Si), % 0 to 0.2
0 to 0.2
Sulfur (S), % 0 to 0.010
0 to 0.020
Titanium (Ti), % 1.0 to 1.7
0