Short-flow production method of high-boron stainless steel plate

Abstract

The invention discloses a short-flow production method of a high-boron stainless steel plate, which belongs to the field of metal material preparation and is used for manufacturing a high-boron austenitic stainless steel plate with a boron content of 0.5-3% and a thickness of 1-10mm. The method comprises the following main process: using three layers of austenitic stainless steel composite tube blanks which have different boron contents as raw materials, wherein the boron content of the intermediate layer is 2-10%, and the boron content of the austenitic stainless steel at the inner and outer layers is 0-0.1%; splitting the austenitic stainless steel into 3-10 parts of which the cross sections are fan-shaped in the axial direction; carrying out hot rolling on the split composite plate blanks, wherein the total deformation is 50-90%, the austenitic stainless steel of the intermediate layer fragments in the rolling process, and the boron elements are subject to preliminary diffusion; carrying out thermal diffusion annealing to uniformly distribute the boron elements by diffusion; and using a cold rolling process to improve the surface quality and the dimensional accuracy of the plates. Based on the characteristic that the plasticity of austenitic stainless steel is poor at high temperature when the boron content is high, the method produces the high-boron stainless steel plate by using the conventional hot rolling process, and has the advantages of short process flow and simple operation of equipment.

Description

technical field

[0001] The invention belongs to the field of metal material preparation, and relates to a short-process production technology of high-boron stainless steel plates, which are mainly used in nuclear power plant fuel storage, heat seed absorption materials and the like. Background technique

[0002] The nuclear reactors currently under construction are mainly pressurized water reactors with high-temperature (280-350°C) and high-pressure (80-185 atmosphere) water as the working medium. This type of reactor generates energy through nuclear fission. Almost all spent fuel assemblies discharged from reactors during nuclear power plant operation are stored underwater in spent fuel storage grids. The spent fuel storage grid structure is equipped with neutron poison materials, which generally have a high thermal neutron absorption cross-section and can effectively absorb thermal neutrons to ensure that the spent fuel components will not reach a critical state during sto...

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