... 16Mn,Q345GB6479-200018-530*3-40Fertilizer making equipment and pipe lineLow and mediun pressure boiled pipe10,20GB3087-199910-530*2- ... pressure boiler,boilling water pipe,locomotive somke pipe(big and small)Fluid pipe20, Q345GB/T8163-19998-630*1.0-40Fluid ... fields, water supply engineering, steam heating, hydroelectric power station and long pipeline transportation projects.3.ends: 2" below plain ...