Alloy 263,Nimonic 263 Foil，Shim,UNS N07263

Alloy 263,Haynes 263 Wire,UNS N07263

Alloy 263 (Haynes 263 Wire, UNS N07263) - Product Introduction

Alloy 263, also known as Haynes 263 Wire and designated as UNS N07263, is a high-performance nickel - cobalt - chromium - molybdenum alloy. Renowned for its outstanding combination of properties, it is available in a wide array of product forms including Bar (Round bar, Flat bar), Ribbon, Wire, Rods, Tube, Pipe, Foil, Plate, Sheet, Strip, and Forging Stock. This versatility allows it to be tailored to a diverse range of applications across multiple industries.

Chemical Composition

The carefully balanced chemical composition of Alloy 263 forms the basis of its remarkable performance. The typical composition (by weight percentage) is as follows:

Nickel (Ni): The majority element, providing a stable matrix for the alloy. Nickel contributes to the alloy's overall strength, especially at elevated temperatures, and serves as a host for the precipitation - hardening phases.

Cobalt (Co): Present in the range of 19.0 - 21.0%. Cobalt enhances the alloy's high - temperature strength and creep resistance. It also plays a role in stabilizing the microstructure and improving the alloy's performance under cyclic loading conditions.

Chromium (Cr): With a content of 19.0 - 21.0%, chromium forms a dense, adherent oxide layer on the alloy's surface. This oxide layer provides excellent oxidation resistance, protecting the alloy from degradation in high - temperature, oxidizing environments. It also contributes to the alloy's corrosion resistance in various chemical media.

Molybdenum (Mo): In the range of 5.6 - 6.1%, molybdenum strengthens the alloy matrix and improves its resistance to pitting and crevice corrosion. It also enhances the alloy's high - temperature strength and creep properties.

Titanium (Ti): 1.9 - 2.4% of titanium is added to form intermetallic compounds during the aging process. These compounds, such as gamma - prime (γ’) precipitates, significantly increase the alloy's strength through precipitation hardening.

Carbon (C): 0.04 - 0.08% carbon is present. Carbon forms carbides with other alloying elements, which can strengthen the grain boundaries and contribute to the alloy's creep resistance. However, the carbon content is carefully controlled to avoid excessive carbide formation, which could negatively impact the alloy's ductility and fabricability.

Silicon (Si): ≤ 0.40%. Silicon helps in deoxidation during the manufacturing process and can also have a minor impact on the alloy's oxidation resistance.

Manganese (Mn): ≤ 0.60%. Manganese is added to improve the alloy's hot - working characteristics and can also play a role in desulfurization.

Sulfur (S): ≤ 0.007%. Sulfur is minimized as it can form brittle sulfide inclusions, which may reduce the alloy's ductility and mechanical properties.

Key Properties

Mechanical Properties

Tensile Strength: In the annealed condition, Alloy 263 has a tensile strength that can be further enhanced through the aging process. After aging, it can achieve high tensile strength values, enabling it to withstand significant mechanical loads. At room temperature, the tensile strength is substantial, and it still retains a remarkable amount of strength even at elevated temperatures. For example, it can maintain a high proportion of its room - temperature strength up to around 816 °C (1500 °F).

Yield Strength: The yield strength of Alloy 263 is also notable, both at room temperature and elevated temperatures. The aging treatment increases the yield strength by precipitating strengthening phases within the alloy matrix. This property is crucial for applications where the material needs to resist plastic deformation under applied loads.

Elongation: In the annealed state, Alloy 263 exhibits excellent ductility, with a good elongation percentage. This allows for easy cold working and forming into various shapes, such as sheets, wires, and tubes. Even after aging to increase strength, the alloy still retains sufficient ductility to prevent brittle failure under normal operating conditions.

Hardness: The hardness of Alloy 263 can be adjusted through heat treatment. In the annealed condition, it has a relatively lower hardness, which facilitates machining and forming operations. After aging, the hardness increases significantly due to the precipitation of strengthening phases, providing enhanced wear and abrasion resistance.

High - Temperature Properties

Continuous Service Temperature: Alloy 263 is suitable for continuous service at elevated temperatures. It can operate effectively up to approximately 850 °C (1560 °F), making it an ideal choice for applications in high - temperature environments such as gas turbines and aerospace engines.

Creep Resistance: The alloy demonstrates excellent creep resistance. Creep is the time - dependent deformation that occurs under a constant load at elevated temperatures. The combination of alloying elements, particularly cobalt, molybdenum, and titanium, helps in forming a stable microstructure that resists creep deformation. This property is crucial for components in gas turbines and power generation equipment that are subjected to high temperatures and mechanical stresses over long periods.

Thermal Fatigue Resistance: Alloy 263 has good thermal fatigue resistance. It can withstand repeated cycles of heating and cooling without developing cracks or significant degradation in performance. This property is essential for components that experience cyclic temperature changes, such as those in combustion chambers and heat exchangers.

Corrosion Resistance

Oxidation Resistance: As mentioned earlier, the chromium content in Alloy 263 provides excellent oxidation resistance. It can form a stable, protective oxide layer on the surface, which prevents further oxidation and scaling even at high temperatures up to about 982 °C (1800 °F). This makes it suitable for applications in high - temperature, oxidizing atmospheres.

General Corrosion Resistance: The alloy also offers good resistance to general corrosion in various chemical environments. The combination of nickel, chromium, and molybdenum provides protection against corrosion in acids, alkalis, and salt solutions. However, its corrosion resistance may vary depending on the specific chemical composition and concentration of the environment.

Pitting and Crevice Corrosion Resistance: Molybdenum in Alloy 263 plays a significant role in enhancing its resistance to pitting and crevice corrosion. Pitting corrosion is the formation of small pits on the surface of the material, while crevice corrosion occurs in narrow gaps or crevices. The alloy's microstructure and the presence of molybdenum make it more resistant to these forms of localized corrosion.

Physical Properties

Density: Alloy 263 has a density that is characteristic of nickel - based alloys, which is relatively high compared to some common metals. This density value is important for applications where weight calculations are crucial, such as in aerospace and automotive industries.

Thermal Conductivity: It has a moderate thermal conductivity, which allows for efficient heat transfer in some applications. However, in applications where heat insulation is required, its thermal conductivity can be managed through appropriate design and the use of insulating materials.

Coefficient of Thermal Expansion: The coefficient of thermal expansion of Alloy 263 is carefully controlled. This property is important for ensuring that components made from the alloy maintain their dimensional stability during temperature changes. It helps in preventing issues such as thermal stress - induced cracking and misalignment in assemblies.

Product Forms and Their Applications

Bar (Round bar, Flat bar)

Round bars and flat bars of Alloy 263 are widely used in machining applications. They can be machined into various components such as shafts, bolts, and nuts for use in high - temperature mechanical systems. In aerospace, these bars may be used to manufacture parts for aircraft engine mounts and structural components that need to withstand high temperatures and mechanical loads. In industrial applications, they can be used in the construction of high - temperature furnaces and heat treatment equipment.

Ribbon

Alloy 263 ribbons are often used in applications where a thin, flexible form of the alloy is required. They can be used in the production of thermal insulation materials, as well as in some electrical applications where high - temperature resistance and electrical conductivity are needed. For example, in high - temperature sensors, the ribbon form can be used to make contact leads that can withstand harsh thermal environments.

Wire (Haynes 263 Wire)

Haynes 263 Wire is highly versatile. It is commonly used in welding applications as a filler metal for joining Alloy 263 components or for welding other materials in high - temperature service. The wire can also be used to make springs, screens, and meshes that need to operate in high - temperature and corrosive environments. In the automotive industry, it may be used in the manufacturing of catalytic converter components due to its high - temperature and corrosion resistance properties.

Rods

Rods of Alloy 263 are similar to bars but may have different dimensions or tolerances. They are often used in applications where a solid, cylindrical shape is required. Rods can be used to manufacture pins, axles, and other components in machinery operating at high temperatures. In the power generation industry, they may be used in the construction of turbine blades and other components in steam and gas turbines.

Tube and Pipe

Alloy 263 tubes and pipes are used for transporting fluids in high - temperature and corrosive environments. In the chemical industry, they can be used to transport aggressive chemicals at elevated temperatures. In the oil and gas industry, they may be used in high - temperature, high - pressure pipelines and in equipment for refining processes. In aerospace, tubes made of Alloy 263 can be used in aircraft fuel systems, where they need to withstand high temperatures and the corrosive effects of aviation fuels.

Foil

Foil made from Alloy 263 is extremely thin and is used in applications where a lightweight, high - temperature - resistant material is required. It can be used as a heat - shielding material in aerospace and in some electronic devices to protect sensitive components from high temperatures. Foil can also be used in the production of laminates and composite materials for high - temperature applications.

Plate and Sheet

Alloy 263 plates and sheets are used in the fabrication of large - scale components. In the aerospace industry, they are used to make aircraft engine casings, combustion chamber liners, and wing components. In the power generation industry, plates and sheets can be used to construct boiler components, heat exchanger plates, and reactor vessels. Their large surface area and high - temperature resistance make them suitable for applications where heat transfer and structural integrity are critical.

Strip

Strips of Alloy 263 are often used in applications where a narrow, flat shape is required. They can be used in the production of seals, gaskets, and diaphragms for high - temperature applications. In the automotive industry, strips may be used in the manufacturing of exhaust system components that need to withstand high temperatures and corrosive gases.

Forging Stock

Forging stock of Alloy 263 is used to produce complex - shaped components through the forging process. Forged components made from this alloy are highly durable and can withstand high mechanical loads. In the aerospace industry, forging stock may be used to manufacture turbine disks, blades, and other critical engine components. In the industrial machinery sector, it can be used to produce components for high - temperature, high - stress applications such as in heavy - duty industrial furnaces and presses.

In conclusion, Alloy 263 (Haynes 263 Wire, UNS N07263) with its unique combination of chemical composition, excellent properties, and diverse product forms, is a highly valuable material in industries where high - temperature strength, corrosion resistance, and fabricability are essential requirements. Its applications span across aerospace, power generation, chemical, and many other industries, contributing to the development of high - performance and reliable engineering systems.

Packing of Standard Packing: 

Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 1145 gallon liquid totes Special package is available on request.