Production process of hot-rolled metal composite pipe

Abstract

The invention relates to the technical field of composite seamless pipe production, and discloses a production process of a hot-rolled metal composite pipe. The production process comprises the following steps that A, a composite pipe blank is selected; B, the selected composite pipe blank is inspected, and positioning holes are punched in the composite pipe blank; C, an annular furnace is heated; D, the cut-off pipe blank is perforated; E, pipe rolling is conducted; F, sizing is performed; G, cooling is conducted; H, correcting is performed; I, saw cutting is carried out; J, nondestructive inspection is conducted; and K, manual inspection, packaging and warehousing are carried out. The diameter of the composite pipe blank in the A is 210 + / -1.6 mm, the ovality diameter tolerance is 1.5 mm, the end face gradient is not greater than 5 mm, and the curvature is not greater than 6 mm per meter. According to the production process, the problem of insufficient bonding force strength of the inner-coated composite pipe of a bimetal composite seamless pipe product is solved, and a seamless pipe hot rolling process is adopted. The production process is suitable for production of the composite seamless pipe with a steel pipe as the outer layer and a stainless steel pipe as the lining, and bimetal composite seamless pipe products of various specifications are produced mainly aiming at research and development of a hot rolling process.

Description

technical field [0001] The invention relates to the technical field of composite seamless pipes, in particular to a production process of hot-rolled metal composite pipes. Background technique [0002] The application of metal composite pipes is mainly based on the purpose of economy and resource conservation, as well as special uses on various equipment. For example, it is more reasonable to use stainless steel pipes to manufacture pressure vessels and pipes that require corrosion resistance, but the cost is high; The thickness of the stainless steel pipe is only 2-10% of the overall thickness, which not only meets the corrosion resistance and high enough strength of the container, but also greatly reduces the cost. In addition, some metal materials with excellent heat resistance, corrosion resistance, electrical conductivity and thermal conductivity, such as copper, manganese, titanium or chromium, have the problem of scarcity of resources. If double-layer or multi-layer ...

AI Technical Summary

Problems solved by technology

For example, it is more reasonable to use stainless steel pipes to manufacture pressure vessels and pipes that require corrosion resistance, but the cost is high; The thickness of the stainless steel pipe is only 2 to 10% of the overall thickness, which not only meets the corrosion resistance and high enough strength of the container, but also greatly reduces the cost

In addition, some metal materials with excellent heat resistance, corrosion resistance, electrical conductivity and thermal conductivity, such as copper, manganese, titanium or chromium, have the problem of scarcity of resources. If double-layer or multi-layer composite pipes are used, it will not only help save Resources, can also meet the special needs of many projects

[0003] Due to technical defects in the production process of the existing metal composite pipe, the problem of insufficient bonding strength of the inner cladding pipe of the bimetallic composite seamless pipe product occurs, which greatly affects the use of the product