... steels for bridgesQ235q, Q345q,Q370q,Q420qGB/T714—20005Hot-rolled steel plates for plasticMouldsSM3Cr2Mo,SM3Cr3NiMoYB/T107—19976Hull structural steelsH 6~160W 1500 ... Q690GB/T16270—1996 Main products:steel plate,steel sheet,steel coil,shipbuilding steel sheet,stainless steel sheet,galvanised steel,PPG,steel pipe, steel strip, flat steel, etcMechanical PropertiesGradeThickness(mm)Yieldpoint ...