... alloy steels,stainless steel or PVC,and more.They have high strength,good toughness and resistance to corrosion.size Seamless size:1 ... /2"~24" DN15~DN600Butt weld dimension: 4"~78" DN150~DN1900Wall Thickness sch10, sch20, sch30, std, sch40, ... , sch5s, sch20s, sch40s, sch80s Maxmum wall thickness: 150mm Materials Carbon steel: ASTM/ASME A234 WPB,WPC carbon steel elbow