Sanicro 825 Alloy Designed for Corrosive, High-Temp Environments

Sandvik’s Sanicro 825 (UNS NO8825) is a nickel-iron-chromium alloy in bar and hollow bar, for improved performance in corrosive, high-temperature environments. The alloy extends the company’s growing Sanicro portfolio of nickel alloys and austenitic stainless steels for aggressive wet, corrosive and high-temperature, pressure, acidic and seawater conditions.

The material is a high-strength alloy with minimum 40% nickel content, which is said to have excellent corrosion resistance to acids and alkalis, superior resistance to stress corrosion cracking (SCC) and good corrosion resistance to phosphoric, nitric, sulfuric and organic acids, seawater, caustic chloride alkalis and ammoniac media.

The company says the alloy is stable, easy-to-machine and weld, and is well suited for use in a wide range of components and installations, including heat exchangers, evaporators, offshore piping systems, seawater coolant, valves and flanges. It is suitable for a multitude of industries, including oil and gas, chemical, petrochemical, pulp and paper, pickling equipment, nuclear fuel processing and food processing.

Available in 3- to 7-m lengths with an outside diameter (OD) ranging from 20 to 260 mm, Sanicro 825 offers a cost-effective alternative to superalloys such as Alloy 625 and Alloy 718. Its chemical formulation has been tailored within EN, UNS and ASTM standards.

At elevated temperatures and in corrosive conditions, this new grade offers advantages to standard stainless steel or duplex grades and is said to be more cost-efficient than some superalloys.