• Swastik Pipes Limited

Stainless Steel Pipes & Tubes

Swastik Pipes Limited, with its extraordinary vision into future, began manufacturing ERW Stainless Steel Pipes and Tubes in 2008. Equipped with latest facilities, the company is committed to produce quality product in various sizes. The process commences with the formation of welded mother tube on the tube mill from prime quality stainless steel strips. The latest TIG multi electrode welding technique is employed for superior weld quality and 100% fusion with argon purging, no filler metal added. These mother tubes are solution annealed at 1060 D 1100 DC in continuous annealing furnace followed by immediate quenching to prevent chromium carbide precipitation. Annealing of mother tuber ensures: removal of stress induced during tube forming and cold drawing; sufficient ductility and softness for cold drawing; transformation of the weld zone to austenitic nature; and re-crystallization of metallic grains to original form and thereby improving corrosion resistance. During annealing, scales are formed on the surface of the tubes. In order to remove these, the tubes are pickled by immersing into hot pickling solution made of nitric acid, sulphuric acid hydrofluoric acid. The tubes are then coated with proper lubricant and then cold drawn over a draw bench: to vary the metallurgical structure and restore the properties to the parent material; to achieve a tube having closer dimensional tolerances; to produce tubing of smaller size and wall thickness; to reorient the grain structure of weld portion with that of the parent material; and to remove/minimise the internal bead. Drawing is followed by subsequent annealing and pickling to restore the properties of the entire tube to that of the parent material. The tubes are then passed to impart extra corrosion resistance; thereafter every tube is electrically marked with material grade, size and manufacturing standard.