METHOD OF HIGH-PRECISION PLATES MANUFACTURE Russian patent published in 2008 - IPC C22F1/18 

FIELD: technological processes.

SUBSTANCE: hot rolling of workpiece is carried out in (α+β)- and β-areas. Possibility of high-precision plates manufacture in thickness and nonflatness with minimum level of internal stresses is provided by the fact that final rolling in (α+β)-area is carried out in one direction in several passes with obligatory heating of workpiece up to rolling temperature after every pass. When temperature of plate reaches 500-900°C, preliminarily flattening is performed on roller flattener unit or press. Baking of plates is executed under creep conditions at temperature of 650-800°C with time delay of 5-15 hours and cooling in furnace down to 200-500°C.

EFFECT: increased precision of thickness and nonflatness.

2 tbl, 1 ex