Preparation method of carbon steel tube/stainless steel tube composite tube

Abstract

The invention provides a preparation method of a carbon steel tube/stainless steel tube composite tube, belonging to the technical field of bimetal composite tube preparation. The preparation method is characterized by firstly sleeving two metal tubes subjected to deoiling, acid pickling and polishing with a wire brush together, secondly inserting a core rod into the carbon steel tube, carrying out plastic processing on the two metal tubes once or multiple times, thirdly carrying out finishing and drawing treatment, and finally washing the inner and outer surfaces and cutting the head and the tail, thus obtaining a finished product of the composite tube, wherein the total wall thickness reduction rate during plastic processing is 20-80%; the wall thickness reduction rate of the final pass is 10%; the feeding angle of a plastic processing hammer head is 90 degrees; the discharge speed is 1-5m/min. The carbon steel tube/stainless steel tube composite tube comprises a stainless steel inner layer and an outer layer, wherein stainless steel is an alloy of pure stainless steel and deforming stainless steel. The method has the advantages that not only can the bimetal composite tube with high bonding strength be obtained but also the equipment is simple, the production flexibility is high and the cost is low.

Description

Technical field: [0001] The invention relates to a forming method of a metal pipe, in particular to a forming method for compounding two kinds of metal pipes into a composite pipe. technical background: [0002] For a long time, the pipes used to transport corrosive media, the materials of corrosion-resistant containers, and decorative materials have all been made of pure stainless steel, or non-ferrous metals, or carbon steel or metal and then compounded with plastic to make composite pipes or containers. The disadvantage of this type of product is that it is expensive and thus difficult to be widely used. In order to reduce costs, thin-walled tubes or container products are often used, but the strength and rigidity of the products are weakened, which affects the use. Using metal composite technology to produce layered composite pipe, so that the composite pipe has the advantages of two (multiple) metals; the thermal conductivity, strength, electrical conductivity, thermal...

AI Technical Summary

Problems solved by technology

The disadvantage of this type of product is the high cost, which makes it difficult to be widely used

[0003] The production process of bimetallic composite pipe mainly includes cold processing composite methods such as drawing, rolling, spinning, hydraulic bulging, and vacuum method, and thermal processing composite methods such as hot extrusion, thermal diffusion welding, and centrifugal casting. Both methods have the problems of complex process, large equipment investment, high energy consumption, etc., and they are kept at high temperature for a long time, and brittle intermetallic compounds are easily produced at the interface, which affects the performance of bimetallic tubes.