A method of producing rectangular boards, in particular, large-scale ones consisting in being conducted by hot forging of hollow ingots, while the crop end cut out from the hollow ingot and the hollow ingot is forget on a mandrel to a hollow body with the required thickness of s.sub.1.n. of the wall corresponding to the thickness of s.sub.3.n. of the rectangular board. The hollow body is then pressed in the radius direction. so that the walls of the original body in the direction of the compression touch each other, and then they are cut from both sides, e.g. with flame, thus acquiring two identical boards of a rectangular cross section having the thickness s.sub.3.n..
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