Abstract: A heavy plate and a thermomechanical treatment method of a starting material, more particularly a slab ingot, for producing the heavy plate consisting of a steel alloy. An optimum of toughness values and the yield strength ratio Rp0.2/Rm can be found in which a cooling from a second final rolling temperature, more particularly ?Ar3, of the second rolling procedure to a first temperature between 250 and 500° C., more particularly 300 to 450° C., is carried out at a first cooling rate in a first stage after the second rolling procedure, and a cooling to room temperature is carried out at a second cooling rate in a subsequent second stage, wherein a straightening procedure, more particularly a hot straightening procedure, is carried out after the first stage, more particularly during the second stage, and wherein the first cooling rate is >the second cooling rate.

Abstract: A heavy plate and thermomechanical treatment method are disclosed for a starting material, more particularly a slab ingot, for the production of a heavy plate consisting of a steel alloy. In order to be able to achieve advantageous mechanical characteristics in the heavy plate, it is proposed for a multi-stage cooling with optionally at least one straightening procedure to take place after the final forming in that a cooling from a second final rolling temperature, more particularly ?Ar3, of the second rolling procedure to a first temperature between Ar3 and Ar1 is carried out at a first cooling rate in a first stage after the second rolling procedure and a cooling from the first temperature to a second temperature <Ar1 is carried out at a second cooling rate in a subsequent second stage, where the first cooling rate is < the second cooling rate.