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S40977 Stainless Steel vs. Nickel 725

S40977 stainless steel belongs to the iron alloys classification, while nickel 725 belongs to the nickel alloys. They have a modest 21% 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 (7, in this case) are not shown.

For each property being compared, the top bar is S40977 stainless steel and the bottom bar is nickel 725.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 21
34
Fatigue Strength, MPa 200
260
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 76
78
Shear Strength, MPa 320
580
Tensile Strength: Ultimate (UTS), MPa 510
860
Tensile Strength: Yield (Proof), MPa 310
350

Thermal Properties

Latent Heat of Fusion, J/g 270
320
Maximum Temperature: Mechanical, °C 720
980
Melting Completion (Liquidus), °C 1440
1340
Melting Onset (Solidus), °C 1400
1270
Specific Heat Capacity, J/kg-K 480
440
Thermal Expansion, µm/m-K 10
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.9
1.5
Electrical Conductivity: Equal Weight (Specific), % IACS 3.3
1.6

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
75
Density, g/cm3 7.8
8.5
Embodied Carbon, kg CO2/kg material 1.9
13
Embodied Energy, MJ/kg 27
190
Embodied Water, L/kg 97
270

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 92
240
Resilience: Unit (Modulus of Resilience), kJ/m3 250
300
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 18
28
Strength to Weight: Bending, points 18
24
Thermal Shock Resistance, points 18
23

Alloy Composition

Aluminum (Al), % 0
0 to 0.35
Carbon (C), % 0 to 0.030
0 to 0.030
Chromium (Cr), % 10.5 to 12.5
19 to 22.5
Iron (Fe), % 83.9 to 89.2
2.3 to 15.3
Manganese (Mn), % 0 to 1.5
0 to 0.35
Molybdenum (Mo), % 0
7.0 to 9.5
Nickel (Ni), % 0.3 to 1.0
55 to 59
Niobium (Nb), % 0
2.8 to 4.0
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 0.2
Sulfur (S), % 0 to 0.015
0 to 0.010
Titanium (Ti), % 0
1.0 to 1.7