A mechanical composite pipe lined with 825 nickel-based alloy and its manufacturing method

Abstract

The invention discloses a mechanical composite pipe lined with 825 nickel base alloy and a manufacturing method thereof. The mechanical composite pipe lined with the 825 nickel base alloy comprises an inner 825 nickel base alloy pipe and an outer low-carbon steel pipe. The manufacturing method comprises the following steps: after the inner 825 nickel base alloy pipe and the outer low-carbon steel pipe are shaft assembled, mechanical diameter expansion equipment is adopted for performing sectional type diameter expansion or continuous diameter expansion on the inner part of the assembled pipe; the diameter expansion quantity is enough to enable the inner 825 nickel base alloy pipe to generate plastic deformation, and the deformation quantity of the outer low-carbon steel pipe is close to the maximum elastic deformation; after the diameter expansion is completed, a reducing and sizing mill is adopted for performing reducing and sizing treatment on the outer part of the assembled pipe; the mechanical composite pipe is inspected after being subjected to diameter expansion at the inner part and reducing and sizing treatment at the outer part; and after the mechanical composite pipe passes the inspection, each of the pipe ends is cut by a certain size for build-up welding and subjected to groove processing treatment. The manufacturing method provided by the invention is not limited by the material strength of the inner and outer pipes, all needed is to change the reducing and sizing quantity of the outer part, and the effective combination of the inner 825 nickel base alloy pipe and the outer low-carbon steel pipe is realized.

Description

Technical areas: [0001] The invention belongs to the oil and gas transportation steel pipe manufacturing industry, and specifically relates to a mechanical composite pipe lined with 825 nickel-based alloy and a manufacturing method thereof. Background technique: [0002] Statistics show that since 2000, my country's annual corrosion losses have exceeded 500 billion yuan, accounting for about 5% of the gross national product, and pipeline corrosion accounts for a considerable proportion of it. Experience and statistics from developed countries show that more than a quarter of corrosion losses can be controlled through anti-corrosion means. As long as we take effective anti-corrosion measures, we can extend the service life of equipment and equipment, and actively promote the use of new anti-corrosion equipment, new technologies, new processes, and new materials. Our country can reduce corrosion losses by at least 30% and recover hundreds of billions of losses. Yuan. [0003...

AI Technical Summary

Problems solved by technology

The disadvantage of this mechanical composite pipe is that when the mechanical composite pipe is manufactured by a single forming process such as internal expansion, there are special requirements for the strength of the raw material. The internal expansion process generally requires that the strength of the carbon steel outer tube is higher than that of the nickel-based alloy inner tube.

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