Inconel 925, also known as Incoloy 925 (UNS N09925), is a nickel-iron-chromium alloy containing molybdenum, copper, titanium and aluminium. It offers high strength and excellent corrosion resistance due to its combination of metals and chemical composition. It has sufficient amounts of nickel to protect against chloride-ion stress-corrosion cracking. In addition, the nickel combined with molybdenum and copper provides superior resistance to reducing chemicals.
The presence of molybdenum additionally helps strengthen the alloy’s ability to resist pitting and crevice corrosion. Inconel 925 has applications in industries such as oil & gas drilling, aerospace engineering, automotive manufacturing, turbo machinery components, etc. It also serves for making safety equipment like submarine cages and underwater connectors. This versatile alloy can be used for many types of products that need to be able to withstand harsh environments or corrosive agents. Additionally, it can be used in heat exchangers or any part that requires welding due to its great weldability characteristics.
Table of Contents
- Inconel 925 Specifications
- Inconel 925 Chemical Composition
- Physical and Mechanical Properties of Inconel 925
- Applications of Alloy 925
- Heat Treatment of Alloy 925
- Corrosion Resistance of Alloy 925
Inconel 925 Specifications
Inconel 925 Chemical Composition
Inconel 925 (UNS N09925) is a nickel-iron-chromium alloy with the addition of molybdenum, copper, titanium and aluminium. This alloy has been designed to provide an optimal combination of high strength and excellent corrosion resistance. It is widely used in industries such as nuclear power, aerospace engineering, chemical processing and marine applications due to its superior properties.
The nickel content of Alloy 925 is sufficient for protection against chloride-ion stress-corrosion cracking. Along with molybdenum and copper, this alloy offers outstanding resistance to reducing chemicals. The addition of molybdenum also increases the alloy’s pitting and crevice corrosion resistance. Inconel 925 also features excellent formability and weldability due to its low carbon content. .
Physical and Mechanical Properties of Incoloy 925
INCOLOY 925 offers superior strength and outstanding corrosion resistance compared to standard alloys. It is also capable of resisting the corrosive effects of chloride ions and reducing chemicals due to its high nickel content. The molybdenum in the alloy further reinforces its resistance against pitting and crevice corrosion.
In terms of physical properties, INCOLOY® alloy 925 has an ultimate tensile strength of 745 MPa (108 ksi), yield strength of 413 MPa (60 ksi) and elongation rate of 25%. Its hardness ranges from 70 – 75 HRC depending on the heat treatment applied as well as the condition it is in.
Applications of Alloy 925
INCOLOY® alloy 925 (UNS N09925) is an age-hardenable nickel-chromium alloy with additional elements of molybdenum, copper, titanium, and aluminium. The combination of its high strength and excellent corrosion resistance makes it a popular choice for a wide range of applications.
Alloy 925 is used in the aerospace industry, particularly for turbine blades and other components exposed to high heat and pressure. It is also used in highly corrosive environments such as offshore oil rigs due to its resistance to chloride ion stress corrosion cracking.
The inconel alloy is also found in petrochemical processing plants, in nuclear power plants, and can also be found in medical implants due to its biocompatibility. On top of that, its wear resistance makes it a perfect choice for valves in the water treatment industry. Other applications include recuperators, gas turbines, shafts & fasteners, exhaust systems & manifolds as well as pump parts & bolts.
Heat Treatment of Alloy 925
INCOLOY® alloy 925 (UNS N09925) is an age-hardenable nickel-iron-chromium alloy with additions of copper, molybdenum, titanium and aluminium, designed to provide a combination of high strength and excellent corrosion resistance. Heat treatment of Alloy 925 is necessary for achieving its full benefits as this process helps to alter the microstructure and properties of the material.
Annealing, solution heat treatment, ageing treatments, and other processes are used to tailor the mechanical properties according to desired applications. Annealing is a process that involves heating. Alloy 925 at relatively low temperatures to reduce hardness and increase ductility. This process also helps remove hardening effects which can occur due to cold working or machining of the material.
Corrosion Resistance of Alloy 925
The strength and Corrosion Resistance of Alloy 925 is a result of its unique chemical composition, which is comprised of nickel, iron, chromium, molybdenum, copper, titanium and aluminium. This combination of elements provides the alloy with both superior strength and excellent corrosion resistance making it an ideal choice for applications that require resistance to harsh environmental conditions.
The nickel content in Alloy 925 gives it protection against chloride-ion stress corrosion cracking. The alloy’s molybdenum and copper content provide outstanding resistance to reducing chemicals while also protecting it from pitting and crevice corrosion. The addition of titanium and aluminium further increases the alloy’s corrosion resistance capabilities by forming a protective oxide layer on the surface of the material when exposed to certain corrosive agents.