Duplex Steel Pipes & Tubes Manufacturer, Suppliers in Saudi Arabia Vishal Tube Industries gives a complete variety of Duplex Steel Pipes and Tubes tailored for the demands of Saudi Arabia's business landscape. Our ASTM A790/A789 Duplex Steel Pipes and Tubes in Saudi Arabia Duplex Steel UNS S31803 and UNS S32205 Pipes and Tubes stand out for his or her precise microstructure, balancing ferrite and austenite in same proportions.