... Q550,Q620,Q690GB/T16270—1996Main 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(Mpa)Tensile ... , pressure vessel factory, power generation, naval and military steel fabrication, machined metal parts industries,etc.Stock over 100,000 ton about ...