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Nickel 625 vs. AISI 418 Stainless Steel

Nickel 625 belongs to the nickel alloys classification, while AISI 418 stainless steel belongs to the iron alloys. There are 30 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 625 and the bottom bar is AISI 418 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
200
Elongation at Break, % 33 to 34
17
Fatigue Strength, MPa 240 to 320
520
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 79
77
Shear Strength, MPa 530 to 600
680
Tensile Strength: Ultimate (UTS), MPa 790 to 910
1100
Tensile Strength: Yield (Proof), MPa 320 to 450
850

Thermal Properties

Latent Heat of Fusion, J/g 330
270
Maximum Temperature: Mechanical, °C 980
770
Melting Completion (Liquidus), °C 1350
1500
Melting Onset (Solidus), °C 1290
1460
Specific Heat Capacity, J/kg-K 440
470
Thermal Conductivity, W/m-K 11
25
Thermal Expansion, µm/m-K 13
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.3
2.8
Electrical Conductivity: Equal Weight (Specific), % IACS 1.4
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 80
15
Density, g/cm3 8.6
8.0
Embodied Carbon, kg CO2/kg material 14
2.9
Embodied Energy, MJ/kg 190
41
Embodied Water, L/kg 290
110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220 to 250
170
Resilience: Unit (Modulus of Resilience), kJ/m3 260 to 490
1830
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 26 to 29
38
Strength to Weight: Bending, points 22 to 24
29
Thermal Diffusivity, mm2/s 2.9
6.7
Thermal Shock Resistance, points 22 to 25
40

Alloy Composition

Aluminum (Al), % 0 to 0.4
0
Carbon (C), % 0 to 0.1
0.15 to 0.2
Chromium (Cr), % 20 to 23
12 to 14
Cobalt (Co), % 0 to 1.0
0
Iron (Fe), % 0 to 5.0
78.5 to 83.6
Manganese (Mn), % 0 to 0.5
0 to 0.5
Molybdenum (Mo), % 8.0 to 10
0 to 0.5
Nickel (Ni), % 58 to 68.9
1.8 to 2.2
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 0.5
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 0 to 0.4
0
Tungsten (W), % 0
2.5 to 3.5