Steel plate for large-thickness hydrogen-contacting equipment and its production technology

The invention relates to a steel plate used for a large-thickness hydro-device which belongs to the technical field of steel-making. Counted by weight percentage, the steel plate consists of the following elements: 0.13 to 0.15 percent of C, equal to less than 0.10 percent of Si, 0.50 to 0.60 percent of Mn, equal to or less than 0.008 percent of P, equal to or less than 0.007 percent of S, 0.14 to 0.18 percent of Ni, 2.30 to 2.50 percent of Cr, equal to or less than 0.15 percent of Cu, 0.95 to 1.10 percent of Mo, 0.015 to 0.020 percent of Nb, 0.010 to 0.020 percent f Ti, 0.020 to 0.045 percent of Al, equal to or less than 0.016 percent of As, equal to or less than 0.015 percent of Sn, equal to or less than 0.003 percent of Sb and the rest is Fe as well as unavoidable impurities. The delivery state of the steel plate is normalizing plus annealing; the quality of the steel is pure; the capacity for resisting the corrosion of hydrogen is excellent; besides, the steel plate has excellent weldability and comprehensive mechanical properties.