What are the types of welded steel pipes?

Welded steel pipes, also known as welded pipes, are steel pipes welded by steel plates or steel strips. Welded steel pipes "have the advantages of simple production process, high production efficiency, more varieties, less equipment funds, etc., but the total strength is lower than seamless steel pipes. Since the 1930s, with the rapid development of high-quality strip rolling and welding With the advancement of inspection technology, the quality of welding continues to improve, and the varieties and specifications of welded pipes are increasing, seamless steel pipes are replaced by more and more fields. Welded steel pipes through welding can be divided into straight welded pipes and spiral welded pipes. The process of straight seam welded pipes is carried out. Simple, high production efficiency, low cost and rapid development. The strength of spiral welded pipes is generally higher than that of straight welded pipes. Welded pipes with different pipe diameters can be produced under the same billet width. But compared with straight seam pipes of the same length, the welded seam The length has increased by 30% and 100% respectively, and the production speed is lower. Therefore, most of the small diameter straight seam welded pipes are mostly spiral welded. Next, I want to introduce the types of welded steel pipes.

1. Welded steel pipes can be used for low-pressure fluid transportation, also known as ordinary welded pipes, commonly known as clarinets. Used for conveying low-pressure liquid water, air, gas, oil, steam heating, etc. The wall thickness of the steel pipe for connection is divided into an ordinary steel pipe and a thickened steel pipe, which are divided into non-threaded, steel pipe (smooth steel pipe) and threaded steel pipe. The steel pipe specification is expressed by the nominal diameter (Mm), which is the approximate value of the inner diameter. It is customary to use inches, such as 11 inches, 2 inches, etc. Welded steel pipes are used for low-pressure fluids, not only for direct delivery of fluids, but also as raw materials for galvanized welded steel pipes for low-pressure fluids.

2. Galvanized welded steel pipe can be used for low-pressure working fluid transportation, also known as galvanized welded steel pipe, commonly known as white pipe. Used to transport water, gas, gas, oil and other general low-pressure fluids, such as heating steam, warm water or other hot-dip galvanized welded steel pipes (electric furnace welding or electric welding). The steel pipe wall is divided into ordinary galvanized steel and galvanized thick steel, galvanized steel and unthreaded galvanized steel sheet with threaded in. The steel pipe specification is expressed by the nominal diameter (Mm), which is the approximate value of the inner diameter. Usually use inches, such as 11x2, etc.

3. Ordinary carbon steel casing is a protective sleeve for industrial and civil buildings, installation of steel wire machinery and other devices, and electrical installation.

4. Longitudinal welded steel pipe is a kind of steel pipe parallel to the longitudinal research of steel pipe. It can usually be divided into steel pipe in metric welding process, welding material thin-walled steel pipe, transformer cooling pipe and so on.

5. Spiral submerged arc welded steel pipe is a spiral welded steel pipe with hot-rolled strip steel as the tube billet, which is often formed under temperature. Double-sided submerged arc welding is used for pressure fluid transportation. The steel pipe has strong load-bearing capacity and good weldability. After a variety of rigorous scientific and technical tests and experiments, the use is reliable. Mainly used for pipeline transportation of oil and natural gas.

6. Spiral seam high-frequency welded steel pipe for pressure fluid transportation is a spiral seam high-frequency welded steel pipe, welded by high-frequency lap welding, and hot-rolled strip steel coils are often used as billets. Strong bearing steel and plastic to facilitate the welding process. After various rigorous scientific inspections and tests, it is reliable in use and is mainly used for laying oil and natural gas pipelines.

7. Spiral submerged arc welded steel pipe for low pressure conveying uses hot-rolled strip steel as billet, spiral submerged arc welded steel pipe is room temperature spiral low pressure conveying steel pipe, and hot-rolled steel strip is pipe billet, used for water, gas, steam, etc. Low pressure fluid delivery.

8. Spiral seam high-frequency welded steel pipes for general low-pressure fluid work transportation are mainly formed from hot-rolled strip steel at room temperature. A high-frequency lap method is used to weld high-frequency welded steel pipes to spiral welds. Both are used for low-pressure fluid delivery.

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