Method for preparing heavy piece weight molybdenum sheets

The invention discloses a method for preparing heavy piece weight molybdenum sheets, and belongs to the technical field of manufacturing of molybdenum sheets. The method comprises the following steps: using molybdenum slabs as raw materials, cogging the molybdenum slabs using a hot rolling mill, wherein the cogging temperature is 1300-1450 DEG C and the cogging deformation amount is 20-30%; annealing after the cogging process and then performing the thermal insulation process; after annealing process, performing multi-pass rolling to form the molybdenum slabs until the molybdenum sheets are prepared into the required thickness, and then accomplishing the preparation of the molybdenum sheets. The occurrence rate of the cases during the heavy piece weight molybdenum sheets with the piece weight exceeding 200kg are prepared through rolling process such as delamination, crack and loose can be reduced by the method, and the prepared heavy piece weight molybdenum sheets are smooth in surface, high in density and uniform in microstructure.