ALLOY 1.4562 / UNS N08031 / ALLOY 31

Corresponding Standards: EN 1.4562, UNS N08031

MATERIAL DESCRIPTION

• Alloy 31 is a nickel, chromium and molybdenum stainless steel with nitrogen and copper additions. It combines moderate tensile strength and high ductility with excellent corrosion resistance in sulfuric acid, reducing and oxidizing media and has strong resistance to corrosion and erosion corrosion in phosphoric environment.
• Typically the alloy has PREN of ≥ 48, which ensure that the resistance to pitting corrosion is high.

ASTM B564 UNS N08031 flange is available in various types, including slip-on flanges, socket weld flanges, blind flanges, and weld neck flanges. Each type has its unique design and is suitable for specific applications. For example, the slip-on flange is simple to install and is perfect for low-pressure applications, while the weld neck flange is ideal for high-pressure applications.

CHEMICAL COMPOSITION

PREN = (CR% + 3.3MO% + 16N%) ≥ 48
PRODUCT STANDARDS: ASTM B625 – 14
APPROVALS: FOR USAGE IN PRESSURE VESSELS WITH WALL TEMPERATURES BETWEEN -196°C TO 550°C

APPLICATIONS

Typical applications: Pulp and paper industry, flue gas desulphurization – FGD – systems, sea water heat exchangers, petroleum production and refining industry, mining industry – ore processing…

MECHANICAL PROPERTIES: BAR

HEAT TREATMENT

Solution annealing at min 1150°C followed by water quenching.

WELDABILITY

Very good.

ASTM B564 UNS N08031 flange is made from a nickel, chromium, and molybdenum-based alloy that is highly resistant to corrosion and oxidation. This material offers excellent resistance to a range of corrosive environments, including those containing sulfuric acid, hydrochloric acid, and seawater. Additionally, the alloy provides high stability, excellent ductility, and good workability, making it an ideal choice for high-pressure, high-temperature applications.