Shandong steel plate spot selling prices associated with low manganese full specification sheet is often said, manganese low alloy high strength steel, 16Mn (Q345) or 16Mn (Q345), this material weldability, can be welded in various ways. Usually refers to the plate thickness in the range 4mm-60mm steel plate. 16Mn is the old number, the current grade is Q345. Q345 level has A, B, C, D, E five. 16Mn (Ⅰ, Ⅱ, Ⅲ) mean respectively 1,2,3 forgings. 16MnR is generally the main pressure vessel materials, R refers to the vessel steel, pressure vessel steel plate that is material. 16MnD D is low in the steel. 16MnR welding material properties, generally do not warm up and need not slow cooling, but the thickness is greater than 30 warm 100-150 degrees is required, usually with the J507 can be welded, if the toughness of better words, can also be recommended J507RH. J507 is the electrode J507RH and J507, the mechanical performance from the same, but different drugs on the skin composition, J507RH are ultra-low hydrogen electrodes, low alloy, high toughness.