Hydrostatic pressure expanding composite technology for bimetal composite pipe

Abstract

The invention discloses a hydrostatic pressure expanding composite technology for a bimetal composite pipe. On the theoretical basis of the metal material elastoplastic theory, a residual contact stress calculation system between two layers of pipelines is finally obtained after hydraulic expanding force and expanding compounding technology are built for guiding to select the hydraulic expanding force and evaluate the compounding technology. The invention aims to provide the hydrostatic pressure expanding composite technology for the bimetal composite pipe, which is used for the production technology of the bimetal composite pipe with big caliber, long pipeline and the thick corrosion resistant alloy layer of which the maximum thickness can be 8.00mm.

Description

technical field [0001] The invention relates to a metal pipe compounding process, in particular to a bimetallic compound pipe hydrostatic pressure diameter expansion compounding process. Background technique [0002] The lined corrosion-resistant alloy composite steel pipe is a kind of bimetallic composite pipe. The research and development and application of bimetallic composite pipe in foreign countries are earlier. The early product manufacturing process is mainly based on metallurgical composite methods such as casting and rolling, and is widely used in Corrosion medium fluid pipeline, atomic energy, oil refining and chemical industry, seawater treatment and other fields. However, the high product price brought by this composite method discourages many users, especially for the application of low-pressure fluid pipelines and some low-alloy composite steel pipes. When the heat treatment delivery status of the two metal materials is different, the composite method of metal...

AI Technical Summary

Problems solved by technology

[0009] 1. When used for compounding of slender pipes, because the deformation process of the lining pipe is too intense, it is easy to produce defects such as deformation and bulging;

[0010] 2. The process technology is complicated, and the bonding strength between layers cannot be accurately calculated and controlled;

[0011] 3. Regardless of whether it is explosion or deflagration and recombination, due to the short deformation time, once the lining pipe leaks, the recombination process cannot be terminated in time, and eventually the entire pipeline will be scrapped, and the manufacturing cost will increase. High, not conducive to the promotion and use of products

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