904L Round Bar

904L round bars, a super austenitic stainless steel (UNS N08904), are designed for extreme corrosion resistance in harsh chemical environments where standard alloys fail. Composed of nickel, chromium, molybdenum, and copper, this alloy resists a broad spectrum of acids—including sulfuric, phosphoric, and acetic acids—making it essential in chemical processing, flue gas desulfurization, and pharmaceutical manufacturing. Newstar Hardware's 904L round bars feature a minimum tensile strength of 490 MPa and yield strength of 220 MPa, with elongation exceeding 35%, balancing durability with formability. Manufactured to ASTM A276 and A479, these bars are available in diameters from 10 mm to 200 mm, with hot-rolled or cold-finished surfaces. The alloy's high nickel content (23-28%) and molybdenum (4-5%) provide exceptional resistance to pitting and crevice corrosion in chloride solutions, while copper enhances performance in reducing acids. Ideal for handling concentrated sulfuric acid (up to 50% at 80°C) and seawater, 904L round bars find use in reactor vessels, pickling equipment, and offshore pipelines. Surface treatments like electropolishing are available for hygienic applications, while rigorous testing (intergranular corrosion, tensile testing) ensures reliability in critical service conditions.