Alloy 602CA: A High-Temperature Nickel Alloy for Extreme Service

Alloy 602CA, also known as UNS N06025and EN 2.4633, is a high-temperature nickel-chromium alloy developed for demanding applications involving elevated temperatures, oxidation, carburization and thermal cycling. Its combination of high chromium content, aluminum, yttrium and other alloying elements provides excellent resistance to oxidation and degradation in severe high-temperature environments.

Alloy 602CA is commonly supplied in bar, plate, sheet, tube, pipe, wire and other product forms, depending on the required specification and application.

Alloy 602CA is a nickel-based alloy designed for service at high temperatures where conventional stainless steels and lower-alloyed nickel alloys may not provide sufficient oxidation or carburization resistance.

The alloy contains a relatively high level of chromium together with aluminum and yttrium. These elements contribute to the formation and stability of a protective oxide layer during high-temperature exposure.

Its main characteristics include:

• Excellent oxidation resistance at high temperatures
• Good resistance to carburization
• Good resistance to thermal cycling
• High-temperature strength and creep resistance
• Good resistance to various aggressive furnace atmospheres
• Good long-term stability in demanding thermal environments

These properties make 602CA particularly suitable for components exposed to continuous or cyclic high-temperature service.

Element	Ni	Cr	Fe	Al	C	Ti	Zr	Y
Typical Content	Balance	24–26%	8–11%	2.0–2.4%	0.15–0.25%	0.10–0.20%	0.01–0.10%	0.05–0.12%

Note: Exact limits can vary depending on the applicable product specification and product form, so the relevant standard should be confirmed when purchasing.

One of the major advantages of Alloy 602CA is its performance in high-temperature oxidizing environments.

The combination of chromium, aluminum and yttrium promotes the formation of a stable protective oxide scale. This helps the alloy maintain its surface integrity during prolonged exposure to high temperatures.

602CA also offers good resistance to carburization, making it useful in environments where carbon absorption can cause premature degradation of conventional alloys.

Its high-temperature properties make it suitable for applications involving:

• High operating temperatures
• Repeated heating and cooling
• Oxidizing atmospheres
• Carburizing environments
• Long-term exposure to thermal stress

Alloy 601 and Alloy 602CA are both nickel-chromium alloys designed for high-temperature applications, but they are not interchangeable in every service condition.

Alloy 601 is widely recognized for its oxidation resistance and is commonly used in heat-treatment equipment, furnace components and other high-temperature applications.

Alloy 602CA was developed for even more demanding high-temperature environments, with its higher chromium and aluminum content and controlled additions of yttrium and other elements providing enhanced oxidation and carburization resistance.

In general, 602CA is selected when the application requires particularly strong resistance to oxidation, carburization and thermal cycling at elevated temperatures, while Alloy 601 remains a widely used option for many general high-temperature applications.

The final material selection should be based on the actual operating temperature, atmosphere, mechanical requirements and applicable specifications.

Because of its high-temperature performance, Alloy 602CA is used in a range of industrial applications.

Typical applications include:

Furnace Components

602CA can be used for furnace components exposed to high temperatures and aggressive atmospheres, including:

• Furnace tubes
• Radiant tubes
• Burner components
• Furnace fixtures
• Retorts
• Heat shields

Petrochemical and Chemical Processing

Its resistance to carburization and high-temperature oxidation makes it suitable for selected components in petrochemical and chemical processing equipment.

Heat Treatment Equipment

The alloy can be used for components that experience repeated heating and cooling cycles, where thermal stability and oxidation resistance are important.

Industrial Heating Systems

602CA is also suitable for various high-temperature components in industrial heating and processing systems.

Depending on the specification and manufacturing requirements, Alloy 602CA can be supplied in different forms, including:

• 602CA Bar
• 602CA Round Bar
• 602CA Plate
• 602CA Sheet
• 602CA Tube
• 602CA Pipe
• 602CA Wire
• Forgings

For applications requiring welding or joining, corresponding welding materials are also available for suitable applications.

The commonly referenced designations for Alloy 602CA include:

Standard / System	Designation
UNS	N06025
EN	2.4633
Common Name	Alloy 602CA / 602 CA

Because material designations and specifications can vary according to product form, it is recommended to confirm the applicable standard before ordering.

For welding applications involving Alloy 602CA, suitable nickel-alloy welding consumables are available, including ERNiCrFe-12 / S Ni 6025 for applicable welding procedures.

The appropriate welding material depends on the base metal, welding process and service conditions. Welding procedures should therefore be selected according to the applicable welding specification and engineering requirements.

As a supplier of nickel alloys and stainless steel products, Ronsco can provide Alloy 602CA in different product forms according to customer requirements.

Available products may include bar, plate, tube, pipe and wire, subject to material specification, size and stock availability.

If you are looking for Alloy 602CA / UNS N06025, please send us your required product form, dimensions, quantity and applicable standard. We can check availability and provide a quotation based on your requirements.

Email: support@ronsteel.com