LSAW black steel pipes We can supply the products of high quality,favorable price ... neck flanges ,slip on flanges ,blind flanges ,seamless steel pipes ,welded steel pipes ,square steel pipesMATERIALCarbon steel,stainless steel,alloy steelWe can ... construction industry, domestic installation and otherSURFACE TREATMENTShot blasted, rust-proof black oilRADIUS OF CURVATURE1D-10D ANSI,ASME,API5L,DIN,JIS,BS ...