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Nickel 725 vs. S21640 Stainless Steel

Nickel 725 belongs to the nickel alloys classification, while S21640 stainless steel belongs to the iron alloys. They have a modest 35% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 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 S21640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 34
46
Fatigue Strength, MPa 260
320
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 78
78
Shear Strength, MPa 580
520
Tensile Strength: Ultimate (UTS), MPa 860
740
Tensile Strength: Yield (Proof), MPa 350
350

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Maximum Temperature: Mechanical, °C 980
940
Melting Completion (Liquidus), °C 1340
1430
Melting Onset (Solidus), °C 1270
1380
Specific Heat Capacity, J/kg-K 440
480
Thermal Expansion, µm/m-K 13
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.5
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 1.6
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 75
17
Density, g/cm3 8.5
7.7
Embodied Carbon, kg CO2/kg material 13
3.6
Embodied Energy, MJ/kg 190
51
Embodied Water, L/kg 270
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 240
280
Resilience: Unit (Modulus of Resilience), kJ/m3 300
300
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 28
27
Strength to Weight: Bending, points 24
23
Thermal Shock Resistance, points 23
16

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
17.5 to 19.5
Iron (Fe), % 2.3 to 15.3
63 to 74.3
Manganese (Mn), % 0 to 0.35
3.5 to 6.5
Molybdenum (Mo), % 7.0 to 9.5
0.5 to 2.0
Nickel (Ni), % 55 to 59
4.0 to 6.5
Niobium (Nb), % 2.8 to 4.0
0.1 to 1.0
Nitrogen (N), % 0
0.080 to 0.3
Phosphorus (P), % 0 to 0.015
0 to 0.060
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