Incoloy Alloy Plate is a product made from a family of nickel-iron-chromium-based superalloys primarily valued for their balanced combination of high-temperature strength and excellent aqueous corrosion resistance. These alloys resist oxidation, carburization, and, critically, chloride ion stress-corrosion cracking (SCC). Grades like Incoloy 825 are specifically designed to resist strong acids (sulfuric, phosphoric). Incoloy plate is widely used in chemical processing, pollution control (scrubbers), and the oil and gas industry where structures must endure both corrosive chemicals and high operating temperatures.

Incoloy Alloy Plate Description

Incoloy alloys, a registered trademark of Special Metals Corporation, represent a series of nickel, iron, and chromium based alloys. Compared to the pure nickel-based Inconel, Incoloy contains a higher iron content, offering cost-effectiveness and good workability while maintaining excellent oxidation resistance, carburization resistance, and high-temperature performance.

General Performance Characteristics of Incoloy Alloy Plate

1. High-Temperature and Corrosion Performance

Resistance to High-Temperature Corrosion: Grades 800 and 800H offer excellent resistance to oxidation, carburization, and nitridation typically found in furnace and heat treatment atmospheres.

Aqueou Corrosion Resistance (825 & 925): The high nickel and molybdenum content provides exceptional resistance to general pitting, crevice corrosion, and specific resistance to sulfuric and phosphoric acids.

Sulfide and Chloride Resistance: Excellent resistance to sulfide stress cracking (SSC) and chloride ion stress corrosion cracking (SCC), vital for oil and gas applications.

2. Mechanical and Physical Properties

Strength and Creep: Grades like 800H and 925 provide superior creep and tensile strength compared to standard stainless steels, making them suitable for load-bearing structures at elevated temperatures.

Thermal Stability: Exhibits excellent metallurgical stability, allowing long-term service in high-heat environments without severe embrittlement.

3. Fabrication and Workability

Weldability: Most Incoloy grades, particularly the solid solution alloys (800, 825), are readily weldable using common welding methods.

Cold and Hot Working: Possesses good ductility and can be easily cold-formed and hot-worked into plate and sheet products.

Application Value of Incoloy Plate

Incoloy alloy plates are highly valued for applications requiring a strong balance of high-temperature strength, broad corrosion resistance, and good fabricability at a competitive cost:

Petrochemical and Hydrocarbon Processing: Cracking tubes, process piping, furnace components in reformers and ethylene pyrolysis furnaces (Grade 800H).

Oil and Gas Exploration (Sour Service): Downhole equipment, wellhead components, and hangers requiring high strength and resistance to SSC (Grade 925).

Chemical Processing: Equipment handling concentrated non-oxidizing acids, flue gas desulfurization (FGD) systems (Grades 825, 25-6MO).

Power Generation: Superheater and reheater tubing, heat exchangers, and furnace parts (Grade 800H, 840).