Inconel 725 alloy has similar grades in different countries and regions, as follows:
-USA: Inconel 725, UNS N07725
-China: Not yet
Europe: 2.4663
-Japan: NCF 725
Inconel 725
Inconel 725 Alloy Properties
Inconel 725 is a nickel-chromium-molybdenum alloy known for its excellent corrosion resistance and high strength, especially for high temperature, high pressure and extreme corrosive environments. The alloy is widely used in oil, gas and chemical industry. The following details the domestic and foreign approximate grades, compositions, physical properties, heat treatment, processing and welding, applications, and provided specifications and forms of Inconel 725 alloys.
Ingredients
|
element |
Content (%) |
|
Nickel (Ni) |
margin |
|
Chromium (Cr) |
19.0-22.5 |
|
Molybdenum (Mo) |
7.0-9.5 |
|
Niobium (Nb) |
2.75-4.0 |
|
Titanium (Ti) |
1.0-1.7 |
|
Iron (Fe) |
margin |
|
Manganese (Mn) |
≤ 0.35 |
|
Silicon (Si) |
≤ 0.2 |
|
Aluminum (Al) |
≤ 0.35 |
|
carbon (C) |
≤ 0.03 |
|
Phosphorus (P) |
≤ 0.015 |
|
Sulfur (S) |
≤ 0.01 |
physical properties
|
performance index |
value |
|
density |
8.4 g/cm³ |
|
melting point |
1300-1350°C |
|
Coefficient of thermal expansion (20-1000°C) |
12.8 x 10⁻⁶ /°C |
|
thermal conductivity |
11.0 W/(m·K) |
|
modulus of elasticity |
200 GPa |
heat treatment
|
Processing Steps |
Description |
|
solution treatment |
was heated at 1020-1080°C and then rapidly cooled. |
|
aging treatment |
was kept at 620-650°C for 4 hours, then cooled to 480°C by furnace cooling, kept at 8 hours and then air cooled. |
machining and welding
·Cold working: suitable for cold drawing and cold rolling, which can increase strength.
·Hot processing: It should be carried out between 900-1150°C.
·welding: suitable for TIG and MIG welding, after welding heat treatment to restore material properties.
Application
·Oil and gas industry: used in downhole equipment and acid gas processing equipment.
·chemical: used in acidic and high temperature corrosive environment equipment.
·Offshore engineering: for corrosion-resistant offshore structures and equipment.
·Aerospace: Structural components in high temperature environments.
Inconel 725 alloys are available in different shapes and sizes, including plates, bars, wires and forgings.
