1) China steel pipes/tubes 2) ASTM,DIN,EN,JIS 3) 10#,20#,45#,16Mn, ST35,ST37,ST37.4,ST45,ST52, ... ) ,BKW(+LC) ,BKS(+SR)ApplicationAutomotive pipeline system;hydraulic system of diesel engine and engineering machinery;hydraulic system of locomotive, aerospace and aviation ...