Rectangular AISI Electric Welded (ERW) Stainless Steel Tubing

Rectangular ERW stainless steel tubing (rectangular hollow section / RHS) is produced by cold-forming stainless steel strip into a rectangular profile, followed by continuous longitudinal seam welding (typically TIG, laser, or high-frequency induction welding). Grade designations follow the AISI (American Iron and Steel Institute) classification system.