LSAW black steel pipes We can supply the products ... 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,JIS ... ,hope happy cooperate with you! LSAW black steel pipes