Sachiya Steel International is one of the leading manufacturer and exporter Hastelloy B2 Tube to Union Fittings, which are made under the guidance of our skilled professionals who ensure to use latest tools and improved techniques in the manufacturing process. Hastelloy B2 Tube Fittings (UNS N10665) is a nickel - molybdenum alloy with significant resistance to reducing environments, such as hydrogen chloride gas and sulfuric, acetic and phosphoric acids.