Interlayer vacuum coating method during blank manufacturing process of hot rolling composite plate

Abstract

Disclosed is an interlayer vacuum coating method during a blank manufacturing process of a hot rolling composite plate. A vacuum coating device mainly comprises an electrolytic furnace, an electromagnetic oscillator, a siphon pipe, a siphon valve, a vacuum pipe and a mechanical pump and diffusion pump assembly. Symmetrically combined stainless steel composite blank materials comprise two groups which each include a low alloy steel base layer and a stainless steel cladding layer, and a nickel plating interlay is generated between each low alloy steel base layer and the corresponding stainless steel cladding layer. When the stainless steel cladding layers of the two groups of blank materials are opposite, the space between the two stainless steel cladding layers is coated with a separant layer. According to the specific operation method, the lateral surfaces of the stainless steel composite blank materials are drilled, then the vacuum pipe, the siphon pipe and the composite plate are welded together, the periphery of the symmetrically combined stainless steel composite blank materials is sealed and vacuumized, and the vacuum pipe is sealed; the siphon valve is opened, molten nickel in the electrolytic furnace is made to enter the space between the layers of the stainless steel composite blank materials, and after the nickel is condensed, multiple times of rolling is carried out. The interlayer vacuum coating method during the blank manufacturing process of the hot rolling composite plate is simple in process, good in product quality, high in yield and low in cost.

Description

technical field [0001] The invention relates to a metal composite billet manufacturing method. Background technique [0002] As a resource-saving product, low-alloy steel / stainless steel clad plate should not only have the corrosion resistance of stainless steel, but also have the good mechanical strength and processing performance of carbon steel. The nickel layer is introduced between the interlayers of the composite board, on the one hand, it plays an isolation role between the base layer and the cladding layer, hinders the diffusion of carbon, avoids the formation of intermetallic compounds, and ensures the corrosion resistance of the composite board. In addition, due to the presence of the nickel layer, the propagation rate of stress corrosion cracks can be significantly reduced. Under the existing technical conditions, the general method for preparing nickel-plated stainless steel composite blanks is: first, degrease the stainless steel surface to remove grease; secon...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: on the one hand, the electroplating nickel process is relatively backward, and the quality of the product in the process is difficult to control. If the electroplating wastewater after electroplating cannot be effectively treated, it will cause great pollution to the environment; thermal spraying technology The coating has low density, is not tightly combined with the carbon steel substrate, and has poor thermal shock resistance

On the other hand, the nickel-plated layer on the surface of carbon steel is easy to adhere to foreign matter (such as moisture, dust, crystals, fibers, etc.) in the external environment, resulting in uneven coating, pits, pinholes, particles, etc. Post-impurity removal treatment and surface finishing, the process is complicated, reducing its production efficiency

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