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Nickel 725 vs. S21900 Stainless Steel

Nickel 725 belongs to the nickel alloys classification, while S21900 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 (5, in this case) are not shown.

For each property being compared, the top bar is nickel 725 and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
50
Fatigue Strength, MPa 260
380
Poisson's Ratio 0.29
0.28
Reduction in Area, % 45
57
Shear Modulus, GPa 78
78
Shear Strength, MPa 580
510
Tensile Strength: Ultimate (UTS), MPa 860
710
Tensile Strength: Yield (Proof), MPa 350
390

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 980
980
Melting Completion (Liquidus), °C 1340
1400
Melting Onset (Solidus), °C 1270
1350
Specific Heat Capacity, J/kg-K 440
480
Thermal Expansion, µm/m-K 13
17

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
15
Density, g/cm3 8.5
7.7
Embodied Carbon, kg CO2/kg material 13
3.0
Embodied Energy, MJ/kg 190
43
Embodied Water, L/kg 270
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
300
Resilience: Unit (Modulus of Resilience), kJ/m3 300
380
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
26
Strength to Weight: Bending, points 24
23
Thermal Shock Resistance, points 23
15

Alloy Composition

Aluminum (Al), % 0 to 0.35
0
Carbon (C), % 0 to 0.030
0 to 0.080
Chromium (Cr), % 19 to 22.5
19 to 21.5
Iron (Fe), % 2.3 to 15.3
59.4 to 67.4
Manganese (Mn), % 0 to 0.35
8.0 to 10
Molybdenum (Mo), % 7.0 to 9.5
0
Nickel (Ni), % 55 to 59
5.5 to 7.5
Niobium (Nb), % 2.8 to 4.0
0
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0 to 0.015
0 to 0.045
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