... , 16Mn,Q345GB6479-200018-530*3-40Fertilizer making equipment and pipe lineLow and mediun pressure boiled pipe10,20GB3087-199910-530*2-40Over ... pressure boiler,boilling water pipe,locomotive somke pipe(big and small)Fluid pipe20, Q345GB/T8163-19998-630*1.0-40Fluid ... 40Carrying gas,water or oil in the industries of petroleum and natural gasHydraulic prop pipe27SiMnGB/T17396-199870-377*9-40Hydraulic ...