Duplex steel S31803 / S32205 butt welded pipe fittings, manufactured to international quality standards, using high-grade steel. Duplex Steel S31803 Elbow Butt Weld Fittings are stainless steel, a type of stainless steel designed to improve resistance to pitting, high strength, stress corrosion, crevice corrosion and cracking. Duplex steel S32205 tee butt welded pipe fittings are often used in chemical process industries: such as sulfuric acid production, nitric acid process, phosphoric acid process, ethylene oxide, polypropylene production, PVC, equipment for handling organic and fatty acids, chemical storage and tankers, thermal Duplex steel S31803 reducer fittings such as exchangers are resistant to chloride environments and sulfide stress corrosion.