... Length:4000-13000mm 5. (S)A516 G Mild steel checker plate(Q235B,SS400,St37-2,St52,ASTM A36,A283GRC,S235JR ... Q345qC (16Mnq), Q370qC, Q420qCBuilding Structural Steel Plate: GB Q235GJC, Q345GJC, Q390GJC, Q420GJC, Q460GJCHigh Quality Carbon Steel Plate: 1>. ASTM 10252>. GB ... . We also supply special specification steel plates as customers' requirement. Mild steel checker plate(Q235B,SS400,St37-2,St52,ASTM ...