Mechanical bimetal composite pipe with thickened pipe end lining layer and preparation method thereof

Abstract

The invention discloses a mechanical bimetal composite pipe with a thickened pipe end lining layer. The mechanical bimetal composite pipe comprises a base pipe and a liner pipe assembled in the base pipe, the two ends of the base pipe both exceed the liner pipe, and the exceeding parts of the base pipe are all expanded sections. A thickening layer is arranged between the expanded sections and the liner pipe, and the inner diameter of the thickening layer is equal to that of the liner pipe. The sum of the wall thicknesses of the expanded sections and the thickening layer is greater than the sum of the wall thicknesses of the liner pipe and the base pipe. The invention further discloses a method for preparing the mechanical bimetal composite pipe with the thickened pipe end lining layer. The method comprises the steps that firstly, the mechanical bimetal composite pipe is assembled and prepared; secondly, an expanding process is designed; thirdly, a liner pipe blank is cut off and expanded, and the thickening layer is prepared; and fourthly, subsequent treatment is conducted. According to the mechanical bimetal composite pipe with the thickened pipe end lining layer and the preparation method thereof, the two ends, exceeding the liner pipe, of the base pipe in the composite pipe are arranged to be the expanded sections, the thickening layer is further arranged, thickening of the liner layer at the pipe end is achieved, and the problems that the bimetal composite pipe is large in welding technology difficulty and the quality is difficult to guarantee are solved. The preparation process is simple, the preparation efficiency is high, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of pipe material manufacturing, and in particular relates to a mechanical double-metal composite pipe with a thickened inner liner at the pipe end and a preparation method thereof. Background technique [0002] In recent years, mechanical bimetallic composite pipes have been widely used in the fields of petroleum and natural gas chemical industry due to their high cost performance, and have achieved significant economic and social benefits. The application of this product solves the technical and economic problems of poor corrosion resistance of general materials and high cost of corrosion-resistant alloys that have plagued related fields for many years, thus achieving rapid development. [0003] The connection of bimetal composite pipe is the same as that of other steel pipes, and there are various methods such as welding, thread, flange, etc., among which the line pipe is mainly welded. Due to the special...

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Problems solved by technology

However, the mechanical composite pipe end has many surfacing welding procedures, complex structure and process, and high manufacturing cost. During the surfacing process, the high temperature affects the material properties of the pipe end and the base pipe. Pipe weld strength has a certain influence

For mechanical bimetallic composite pipes with a large diameter-to-thickness ratio, boring is difficult, equipment investment is high, and the diameter of the surfacing pipe end is severely reduced. Therefore, surfacing welding at the pipe end is not feasible in terms of technology or economy.

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