Furnace body steel plate of high-temperature reaction furnace

The utility model relates to the field of a high-temperature reaction furnace, in particular to a furnace body steel plate of the high-temperature reaction furnace. The furnace body steel plate comprises an upper part structure of a cracking furnace; a gas outlet connecting pipe is arranged on the upper part structure of the cracking furnace; a weld joint is formed in the gas outlet connecting pipe; the gas outlet connecting pipe is connected with a clamp sleeve; a flange with the height of 80mm is punched at an equipment opening formed in the gas outlet connecting pipe on the inner wall of the upper part structure of the cracking furnace; the original opened weld joint form is changed into a butt weld joint from a corner weld joint, and the weld joint is far away from a heat affected zone, so that the weld joint crack generation probability is reduced; after the furnace body steel plate is used, the thermal stress concentration at a furnace gas outlet is reduced, and the generation of furnace body heat crack is reduced, so that the production cycle of the cracking furnace can be prolonged.