... on flanges ,blind flanges ,seamless steel pipes ,welded steel pipes ,square steel pipesMATERIALCarbon steel,stainless steel,alloy steelWe can produce according to ... domestic installation and otherSURFACE TREATMENTShot blasted, rust-proof black oilRADIUS OF CURVATURE1D-10D ANSI,ASME,API5L,DIN, ... 2000,API5L,,CCSWe have biggest pipe fittings and steel pipes production equipment in china,all of prodcts ...