Nickel Inconel Alloy 725
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Nickel Alloy 725 / Inconel 725 is a nickel chromium-molybdenum-niobium alloy that is highly resistant to corrosion and is age hardenable for extremely high strength. It has essentially the same corrosion resistance as INCONEL alloy 625, which is widely used in a broad range of severely corrosive environments. The strength of age-hardened Alloy 725 is of the order of twice that of annealed alloy 625.
Chemical Composition:
| Cr | Ni | Mo | Co | Nb (+Ta) | Ti | W | Cu | C | Mn | N | Si | P | S | Fe | Al | |
| Min | 19.00 | 55.00 | 7.00 | 2.75 | 1.00 | |||||||||||
| Max | 22.50 | 59.00 | 9.50 | 4.00 | 1.70 | 0.03 | 0.35 | 0.20 | 0.015 | 0.01 | Bal | 0.35 |
Mechanical Properties:
| Bars up to 3" (76mm) diameter or section | Bars greater than 10" (254mm) diameter or section | Bars greater than 10" (254mm) diameter or section | ||||
| 0.2% Proof Stress, min | 827 N/mm2 | 120 ksi | 827 N/mm2 | 120 ksi | 827 N/mm2 | 120 ksi |
| Tensile strength, min | 1034 N/mm2 | 150 ksi | 1034 N/mm2 | 150 ksi | 1034 N/mm2 | 150 ksi |
| Elongation, 5.65√S0 and 4D | 20% | 20% | 20% | |||
| Reduction of Area | 35% | 35% | 35% | |||
| Hardness (Rockwell C) | <43 | <43 | <43 | |||
| Impact Strength (-60oC) Longitudinal, Typical | 54J av (47J min) | 40 ft.lb av (35 ft.lb min) | ||||
| Impact Strength (-60oC) Transverse, Typical | 50J av (43J min) | 37 ft.lb av (32 ft.lb min) | 43J av (37J min) | 32 ft.lb av (27 ft.lb min) | ||
Physical Properties:
| Density (Kg.m-1) | 8310 |
| Magnetic Permeability (20°C) | < 1.001 |
| Young's Modulus (kN/mm2) | 204 |
| Poissons Ration | 0.31 |
| Specific Heat, 20°C (J/(g.K)) | 0.43 |
| Electrical Resistivity, 20°C (µΩ-m) | 1.144 |
| Thermal conductivity, 20°C (W/(m.K)) | 10.6 |
| Mean coefficient of thermal expansion, 20-100°C (/K) | 13 x 10-6 |
Mechanical Properties
Inconel alloy 617 has high mechanical properties over a broad range of temperatures. One of the alloy's outstanding characteristics is the strength level it maintains at elevated temperatures. The resistance of the alloy to high-temperature corrosion enhances the usefulness of its strength.
Corrosion Resistance
The composition of Inconel alloy 617 includes substantial amounts of nickel, chromium, and aluminum for a high degree of resistance to oxidation and carburization at high temperatures. Those elements, along with the molybdenum content, also enable the alloy to withstand many wet corrosive environments.
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