Composite welding steel pipe lined with inner thin-wall stainless steel layer

Abstract

The invention provides a composite welding steel pipe lined with an inner thin-wall stainless steel layer. The composite welding steel pipe comprises a base carbon steel layer and an inner thin-wall stainless steel layer. The composite welding steel pipe lined with the inner thin-wall stainless steel layer is formed by compounding of the carbon steel layer and the thin-wall stainless steel layer, prebending and forming, and welding of welding seams; the welding seams consist of thin-wall stainless inner layer welding seams and carbon steel layer welding seams, and the thin-wall stainless inner layer welding seams and the carbon steel layer welding seams are positioned in different positions. The composite welding steel pipe has the advantages that the structure is reasonable, the strength is high, the anti-corrosive property is good, the conveying efficiency is high, the service life is long, the economic and environment-friendly effects are realized, the manufacturing cost is low, the application field is wide, and the steel pipe is suitable for being popularized and applied in a large-scale way.

Description

technical field [0001] The invention relates to the technical field of pipeline equipment for conveying fluids, in particular to a composite welded steel pipe lined with thin-walled stainless steel. Background technique [0002] In petroleum, chemical industry, medicine, environmental protection, food, gas transportation, urban water network transformation, engineering pipeline and other industrial and civil fields, it is inevitable to use many transportation pipelines, such as PP-R pipes, carbon steel pipes, steel-plastic pipes, stainless steel pipes, etc. Steel pipes, copper pipes, and PP-R pipes are cheap and have good corrosion resistance, but their mechanical properties such as compressive strength are not high, they are easy to break and damage, and there are inevitable aging phenomena; carbon steel pipes have high structural strength, but their corrosion resistance It is often corroded and worn out after a certain number of years of use; the inner and outer materials ...

AI Technical Summary

Problems solved by technology

[0002] In petroleum, chemical industry, medicine, environmental protection, food, gas transportation, urban water network transformation, engineering pipeline and other industrial and civil fields, it is inevitable to use many transportation pipelines, such as PP-R pipes, carbon steel pipes, steel-plastic pipes, stainless steel pipes, etc. Steel pipes, copper pipes, and PP-R pipes are cheap and have good corrosion resistance, but their mechanical properties such as compressive strength are not high, they are easy to break and damage, and there are inevitable aging phenomena; carbon steel pipes have high structural strength, but their corrosion resistance It is often corroded and worn out after a certain number of years of use; the inner and outer materials of the steel-plastic pipe have dual physical properties, and their thermal expansion coefficients are different. After use in different environments, different transmission media, and different temperature conditions, the inner layer of plastic will be damaged. falling off; stainless steel tubes and copper tubes have high structural strength and strong corrosion resistance, but their prices are high and they are not suitable for large-scale application and promotion

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