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Nickel 625 vs. AISI 440A Stainless Steel

Nickel 625 belongs to the nickel alloys classification, while AISI 440A stainless steel belongs to the iron alloys. They have a modest 20% 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 (4, in this case) are not shown.

For each property being compared, the top bar is nickel 625 and the bottom bar is AISI 440A stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 33 to 34
5.0 to 20
Fatigue Strength, MPa 240 to 320
270 to 790
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 79
77
Shear Strength, MPa 530 to 600
450 to 1040
Tensile Strength: Ultimate (UTS), MPa 790 to 910
730 to 1790
Tensile Strength: Yield (Proof), MPa 320 to 450
420 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 330
280
Maximum Temperature: Mechanical, °C 980
760
Melting Completion (Liquidus), °C 1350
1480
Melting Onset (Solidus), °C 1290
1370
Specific Heat Capacity, J/kg-K 440
480
Thermal Conductivity, W/m-K 11
23
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.3
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 1.4
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 80
9.0
Density, g/cm3 8.6
7.7
Embodied Carbon, kg CO2/kg material 14
2.2
Embodied Energy, MJ/kg 190
31
Embodied Water, L/kg 290
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220 to 250
87 to 120
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
25
Strength to Weight: Axial, points 26 to 29
26 to 65
Strength to Weight: Bending, points 22 to 24
23 to 43
Thermal Diffusivity, mm2/s 2.9
6.2
Thermal Shock Resistance, points 22 to 25
26 to 65

Alloy Composition

Aluminum (Al), % 0 to 0.4
0
Carbon (C), % 0 to 0.1
0.6 to 0.75
Chromium (Cr), % 20 to 23
16 to 18
Cobalt (Co), % 0 to 1.0
0
Iron (Fe), % 0 to 5.0
78.4 to 83.4
Manganese (Mn), % 0 to 0.5
0 to 1.0
Molybdenum (Mo), % 8.0 to 10
0 to 0.75
Nickel (Ni), % 58 to 68.9
0
Niobium (Nb), % 3.2 to 4.2
0
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 0.5
0 to 1.0
Sulfur (S), % 0 to 0.015
0 to 0.015
Titanium (Ti), % 0 to 0.4
0

Comparable Variants