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S21640 Stainless Steel vs. Nickel 625

S21640 stainless steel belongs to the iron alloys classification, while nickel 625 belongs to the nickel alloys. They have a modest 29% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is S21640 stainless steel and the bottom bar is nickel 625.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 46
33 to 34
Fatigue Strength, MPa 320
240 to 320
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
79
Shear Strength, MPa 520
530 to 600
Tensile Strength: Ultimate (UTS), MPa 740
790 to 910
Tensile Strength: Yield (Proof), MPa 350
320 to 450

Thermal Properties

Latent Heat of Fusion, J/g 290
330
Maximum Temperature: Mechanical, °C 940
980
Melting Completion (Liquidus), °C 1430
1350
Melting Onset (Solidus), °C 1380
1290
Specific Heat Capacity, J/kg-K 480
440
Thermal Conductivity, W/m-K 15
11
Thermal Expansion, µm/m-K 17
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
1.3
Electrical Conductivity: Equal Weight (Specific), % IACS 2.8
1.4

Otherwise Unclassified Properties

Base Metal Price, % relative 17
80
Density, g/cm3 7.7
8.6
Embodied Carbon, kg CO2/kg material 3.6
14
Embodied Energy, MJ/kg 51
190
Embodied Water, L/kg 150
290

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 280
220 to 250
Resilience: Unit (Modulus of Resilience), kJ/m3 300
260 to 490
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 27
26 to 29
Strength to Weight: Bending, points 23
22 to 24
Thermal Diffusivity, mm2/s 4.0
2.9
Thermal Shock Resistance, points 16
22 to 25

Alloy Composition

Aluminum (Al), % 0
0 to 0.4
Carbon (C), % 0 to 0.080
0 to 0.1
Chromium (Cr), % 17.5 to 19.5
20 to 23
Cobalt (Co), % 0
0 to 1.0
Iron (Fe), % 63 to 74.3
0 to 5.0
Manganese (Mn), % 3.5 to 6.5
0 to 0.5
Molybdenum (Mo), % 0.5 to 2.0
8.0 to 10
Nickel (Ni), % 4.0 to 6.5
58 to 68.9
Niobium (Nb), % 0.1 to 1.0
3.2 to 4.2
Nitrogen (N), % 0.080 to 0.3
0
Phosphorus (P), % 0 to 0.060
0 to 0.015
Silicon (Si), % 0 to 1.0
0 to 0.5
Sulfur (S), % 0 to 0.030
0 to 0.015
Titanium (Ti), % 0
0 to 0.4