Method for preventing interface of stainless steel compound plate subjected to vacuum composite rolling from being oxidized

Abstract

The invention discloses a method for preventing an interface of a stainless steel compound plate subjected to vacuum composite rolling from being oxidized, and belongs to the technical field of materials. The method comprises the following steps of: (1) performing surface treatment; (2) alternately overlapping a stainless steel plate material and a carbon steel plate material, and separating by using nickel foils to obtain a composite blank; (3) putting between two metal panels to form a clamped composite blank, or welding two composite blanks to form a composite blank-blocker-composite blankcombined structure, and putting between two metal panels to form the clamped composite blank; (4) putting in a vacuum chamber, vacuumizing and welding the peripheries of contact surfaces; (5) heatingand keeping temperature in a resistance furnace to obtain the composite blank subjected to heat treatment; and (6) removing the metal panels, and rolling the composition blank subjected to heat treatment. The method solves the problem of element diffusion of the interface in the process of preparing a stainless steel-carbon steel compound plate, so that the shear strength of the interface is improved by 10-40MPa, and the decarbonization and a chromium-rich layer of the interface are eliminated.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preventing interface oxidation of vacuum composite rolled stainless steel clad plates. Background technique [0002] Due to its combination of corrosion resistance of stainless steel and low cost of carbon steel, stainless steel-carbon steel clad plate is widely used in various fields such as oil pipelines, natural gas storage tanks and chemical industry. The traditional methods for preparing stainless steel-carbon steel clad plates mainly include explosive clad method, brazing clad method and rolling clad method. The vacuum compound rolling method is a new method of producing composite plates based on the traditional rolling method; this method cuts out stainless steel plates and carbon steel plates with the same length and width, and cleans the surfaces of the stainless steel plates and carbon steel plates to be compounded. Clean the surface to be co...

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Problems solved by technology

After a large number of experimental studies, it was found that although the composite interface of the stainless steel-carbon steel clad plate obtained by the vacuum composite rolling method has a high bonding strength, there is decarburization and a hard chromium-rich layer, decarburization and chromium elements Diffusion of the interface will lead to a decrease in the corrosion resistance of the interface and weaken the bonding performance of the interface; the reason is that during the vacuum composite rolling process, the interface between the stainless steel plate and the carbon steel plate is in direct contact, and the interface is under the action of high temperature in the heating furnace. The carbon element diffuses to the stainless steel side, and the carbon element diffuses to the stainless steel side, resulting in intergranular corrosion. At the same time, the chromium element on the stainless steel side diffuses to the carbon steel side, forming a high-hardness chromium-rich layer, which has a great influence on the plasticity of the composite plate interface. influences

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