... GOST,etc 3)material:carbon steel 4)wt:sch10-sch160 5)API,ISO,CE,etc pipe fitting 90degree LR elbow carbon steel sizeSeamless:from 1/2 ... JISB2311 JISB2312 JISB2313,BS, GB, ISOmaterialCarbon steel (ASTM A234WPB,A234WPC,A420WPL6, ect)Stainless steel(ASTM A403 WP304,304L,316,316L,321 ... ,Mechanical testing,Super living inspection,Magentic particle inspection,etc pipe fitting 90degree LR elbow carbon steel