Duplex Steel UNS S31803 Pipes are designed in different standards such as ASTM A240 / ASME SA240 UNS S31803. They are available in high-grade ASTM A815 - UNS S31803 material in sizes from 1/2 NB to 12 NB inches. These Duplex Steel UNS S31803 Pipes come in the thickness of 0.5-45mm with outer diameter of 6.0-630mm to be used in oil refineries, industrial machinery, chemical plants, power industries, cement etc.