Method for manufacturing multiunit tube

Abstract

The invention pertains to a manufacturing method of disclosed composite pipe, which comprises: an inner pipe (compound layer) adopts stainless steel material and an outer pipe (base layer) adopts carbon steel material, the inner pipe is arranged in the outer pipe, pull/push method is adopted and the function of a formed die is matched to cause the inner pipe and the outer pipe to generate plastic deformation of equal-wall thickness and to compound together in the condensation process. The bimetal composite pipe produced by the manufacturing process can replace stainless steel pipe, non-ferrous metal pipe and various plastics-steel composite pipes and have the same corrosion prevention performance; furthermore, the bimetal composite pipe can also act parts in reducing construction cost of the product, improving working strength, extending application temperature range, improving solderability, facilitating construction, etc., which is widely used in the industries such as petroleum, chemical engineering, electric power, papermaking, medication, food, etc.

Description

technical field [0001] The invention belongs to the technical field of pipe fitting manufacturing technology, and mainly relates to a method for manufacturing a composite pipe. Background technique [0002] At present, in the petroleum and chemical industries, some imported crude oil contains high sulfur content, which is highly corrosive to equipment and pipelines, resulting in a large increase in working conditions with different corrosive properties and higher temperature, pressure, and safety requirements. . The amount of pure stainless steel, copper or more expensive titanium, nickel and other alloy pipes that are usually used in pipeline fluid transportation has risen sharply. Due to the high cost of these pipelines, the production cost is high and difficult to lower. In order to reduce the negative impact of increased production costs, in recent years, with the continuous improvement of production equipment and manufacturing processes, different types of steel-plast...

AI Technical Summary

Problems solved by technology

[0003] 1. The operating temperature range is between -10-150°C, and it is difficult to meet the requirements of high and low temperature working environments widely existing in petroleum, chemical and other fields;

[0004] 2. The cladding layer (inner layer) of steel-plastic composite pipe is basically made of polyethylene, polypropylene, polytetrafluoroethylene and other materials. The strength of such materials is lower than that of metal materials. When the pressure is too high during use , the lining plastic layer will appear cracking, peeling off, etc., resulting in a great reduction in the anti-corrosion performance of the steel pipe body

[0005] 3. Pipe sections and pipe sections and pipe sections and pipe fittings (elbows, tees, size heads, etc.) are connected by flanges, which increases the difficulty and amount of construction, and at the same time increases the number of leakage points, resulting in poor system safety