Sachiya Steel International is a known exporter, manufacturer and trader of Alloy Steel WP91 Buttweld Fittings, which is essentially non - magnetic in the annealed condition and can only be hardened by cold working. Alloy Steel WP91 Elbow Butt Weld Pipe Fittings should be used in heavier sections to reduce the occurrence of carbide precipitation in the heat affected region adjacent to the weld pool.