The invention relates to a process for producing an ultra-
thick plate and belongs to the field of rolling and producing an ultra-thick steel plate in the
metallurgical industry. The invention mainly overcome the defect of producing the ultra-thick steel plate by a traditional model
casting manufacturing blank and an electro-
slag remelting manufacturing blank. The method comprises the following steps:
cutting and fixing lengths of the blanks, mechanically conditioning the blanks (eliminating, leveling and cleaning a single-
surface oxide layer of a
casting blank with a milling
machine, a planer or a shot blast); clamping an
assembly (relatively superposing the cleaning surfaces of the two blanks after
processing, placing the two blanks oppositely and clamping the blanks); mounting the blanks in a
vacuum chamber of an electronic beam
welding machine for purpose of vacuuming; sewing the
assembly on the electronic beam
welding seal edge, heating the
assembly in a furnace and rolling the assembly through
temperature control; and then producing the ultra-thick steel plate. Compared with the traditional electro-
slag remelting production process, the process has the advantages of high production efficiency, reduced
electric power consumption, less investment of production devices and low production cost. Compared with the traditional
die casting production process, the process solves the problem of segregation and looseness of a large-scale
die casting ingot center part; the finished product ratio is high; and the finished product ratio of blank assembly is over 90 %.