Method for producing multiple metal composite pipe

[0057] Embodiment 1. Manufacturing method of stainless steel outer composite pipe.

[0058]The stainless steel outer composite pipe is a multi-metal composite pipe with carbon steel pipe as the base pipe and stainless steel thin-walled welded pipe as the outer composite pipe. The steps of its manufacturing method include:

[0059] 1. Choose carbon steel pipe as the base pipe, not only welded pipe, but also seamless pipe, which can be self-made or purchased in the market; choose stainless steel thin-walled welded pipe as the outer cladding pipe.

[0060] 2. The finishing process of carbon steel pipes includes: starting - drawing and reducing - straightening - removing surface oil.

[0061] (1) the beginning

[0062] The purpose of starting the head is to make the end of the steel pipe form an inverted trumpet shape, and the front end gradually shrinks, so that the head extends out of the drawing die for drawing and reducing the diameter of the steel pipe during the next drawing p

[0091] Embodiment 2. The manufacturing method of composite pipe in stainless steel.

[0092] The stainless steel inner composite pipe is formed by compounding the thin-walled (0.2mm ~ 0.5mm) stainless steel welded pipe on the inner wall of the steel pipe.

[0093] The production of the stainless steel inner composite pipe is also to make the inner layer pipe and the outer base pipe respectively, and then put them together, and draw them with the core mold and the outer mold to make the two layers of metal tightly bonded together to form a composite pipe.

[0094] In this technology, the inner and outer two-layer pipes of the inner composite pipe: carbon steel pipe and stainless steel thin-walled pipe. Like the outer composite pipe, the carbon steel pipe is mainly purchased from outside, and the stainless steel thin-walled pipe is self-made.

[0095] Carbon steel pipes generally use galvanized welded pipes (whichever has anti-corrosion properties), and carbon steel welded pipes or

[0107] Embodiment 3. Copper composite pipe

[0108] Copper composite pipes also have two types of composite pipes: external cladding and internal cladding. From the perspective of use requirements and cost reduction, the thickness of the copper layer is only 0.3-0.5mm. If the user requires it, the copper layer larger than 0.5mm can also be clad.

[0109] Copper tubes generally use copper tubes, which are purchased or self-made. Since thin-walled (0.3-0.5mm) copper tubes with a diameter of more than 30mm are difficult to produce (because most copper tubes on the market are produced by extrusion process, which cannot produce large-scale thin-walled copper tubes), they cannot be bought in the market. But thin strips can be bought, and the manufacturing method of the stainless steel thin-walled welded pipe that above-mentioned external cladding process is used also can produce the thin-walled welded pipe of copper and titanium. Therefore, the copper thin-walled tube is self-made.