Stainless Steel 347H Slotted Pipes: Reliable Steel Distributors, Manufacturers, Suppliers, Stockists, and Exporters. The high-performance grades of piping material manufactured from austenitic stainless steel are the Stainless Steel 347H Slotted Pipes. These are designed to work in extreme conditions, and resistance to corrosion, strength at higher temperatures, and enhanced creep properties...