Large caliber spiral steel pipe manufacturer, anti-corrosion spiral steel pipe for sewage treatment

Description :

　　 Spiral steel pipe is a spiral seam steel pipe made of strip steel coil as raw material, often formed by warm extrusion, and welded by automatic double wire double-sided submerged arc welding process Main production process (1) Raw materials include strip steel coils, welding wire, and flux. Strict physical and chemical tests must be conducted before investment. (2) The head and tail of the strip steel are connected by single or double wire submerged arc welding, and automatic submerged arc welding is used for repair welding after being rolled into a steel pipe. (3) Before forming, the strip steel undergoes leveling, trimming, planing, surface cleaning, conveying, and pre bending treatment. The development direction of thick walled spiral steel pipes With the development of industry, higher requirements have been put forward for the use of spiral pipelines in engineering. The reason for the emergence of thick walled spiral pipelines is that some media that need to be transported generate pressure that ordinary spiral steel pipes cannot bear. If replaced with straight seam steel pipes or seamless steel pipes, it will greatly increase the cost of the project. If it is a dangerous medium, it is inevitable that we will increase the cost. Therefore, when selecting pipelines, it is determined based on the media that need to be transported and the pressure that the media will generate.

　　 Spiral pipe, also known as spiral steel pipe or spiral welded pipe, is made by rolling low-carbon structural steel or low-alloy structural steel strip into a pipe blank at a certain angle of the spiral line (called forming angle), and then welding the pipe seam together. It can produce large-diameter steel pipes with narrower strip steel.

　　Common standards for spiral pipes: SY/T5037-2000 (departmental standard, also known as spiral seam submerged arc welded steel pipes for ordinary fluid transportation pipelines), GB/T9711.1-1997 (national standard, also known as technical delivery conditions for oil and gas industry transportation steel pipes: Grade A steel pipes (GB/T9711.2 Grade B steel pipes with strict requirements)), API-5L (American Petroleum Institute, also known as pipeline steel pipes); It is divided into two levels: PSL1 and PSL2. SY/T5040-92 (spiral seam submerged arc welded steel pipes for piles).

　　Spiral seam submerged arc welded pipe for pressurized fluid transportation: mainly used for pipelines transporting oil and natural gas. Steel pipes have strong pressure bearing capacity, good plasticity, and are easy to weld and process into shapes; Spiral seam submerged arc welded steel pipes for general low-pressure fluid transportation: Submerged arc welded steel pipes made by double-sided automatic submerged arc welding or single-sided welding method for general low-pressure fluid transportation such as water, gas, air, and steam.

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• Large diameter spiral steel pipe