LSAW black steel pipes We can supply the products of high ... ,slip on flanges ,blind flanges ,seamless steel pipes ,welded steel pipes ,square steel pipesMATERIALCarbon steel,stainless steel,alloy steelWe ... , domestic installation and otherSURFACE TREATMENTShot blasted, rust-proof black oilRADIUS OF CURVATURE1D-10D ANSI,ASME,API5L,DIN,JIS, ... quality,hope happy cooperate with you! LSAW black steel pipes