What Are the Categories of Steel Pipes?

With the development of modern industry and the improvement of automation, the requirements for industrial quality inspection and control have become higher, and steel pipe wholesale is the most common product in industrial inspection.

Classification of steel pipe by production method

Steel pipes can be divided into two categories according to production method: seamless steel pipes and welded steel pipes.

  • Seamless steel pipes are made of carbon steel or alloy steel, and are divided into hot-rolled and cold-rolled (drawn) types. Seamless steel pipes can be used in various industries for liquid pressure pipelines and gas pipelines, etc. Seamless steel pipes can be classified by production method as follows: hot-rolled seamless pipes, cold-drawn pipes, precision steel pipes, hot galvanized steel pipe, cold-rolled pipes, and extruded pipes, etc. Inquiry competitive seamless steel pipe for sale!

  • Welded steel pipes are made by welding steel plates rolled into tube shapes with butt joints or spiral seams. The water supply pipelines, gas pipelines, heating pipelines, electrical pipelines, etc. that we commonly use are all welded steel pipe. They can be classified by welding process as follows: furnace-welded pipes, electric-welded (resistance-welded) pipes, and automatic arc-welded pipes. They can also be classified by welding form as straight-seam welded pipes and spiral welded pipes, and by end shape as round welded pipes and shaped (square, flat, etc.) welded pipes. They can be classified by manufacturing method as follows: welded steel pipes for low-pressure fluid transportation, welded spiral steel pipe, direct-wound welded steel pipes, electric-welded pipes, etc.

Classification of steel pipe by material

Steel pipes can be classified by pipe-making material as follows: carbon steel pipes, alloy steel pipes, and stainless steel pipes.

  • Carbon steel pipes can be divided into ordinary carbon steel pipes and carbon structural pipes.

  • Alloy steel pipes include low-alloy pipes, alloy structural pipes, high-alloy pipes, high-strength pipes, bearing pipes, heat-resistant and acid-resistant stainless steel pipes, precision alloy (such as Kovar alloy) pipes, and high-temperature alloy pipes, etc.

Classification of steel pipe by connection method

Steel pipes can be classified by pipe end connection method as follows: plain-end pipes (pipes without threads) and thread-end pipes (pipes with threads).

Thread-end pipes can be divided into ordinary thread-end pipes and thickened thread-end pipes. Thickened thread-end pipes can further be divided into externally thickened (with external threads), internally thickened (with internal threads), and internally-externally thickened (with both internal and external threads) pipes, etc.

Thread-end pipes can also be classified by thread type as follows: ordinary cylindrical or conical threads and special threads, etc.

According to the coating characteristics, steel and pipe can be classified by surface coating characteristics as follows: black pipes (without coating) and coated pipes.

Coated pipes include galvanized pipes, aluminum-coated pipes, chromium-coated pipes, aluminum-infused pipes, and steel pipes with other alloy layers. Galvanized pipes can be further divided into KBG pipes, JDG pipes, threaded pipes, etc.

Coated pipes can be externally coated pipes, internally coated pipes, or internally and externally coated pipes. The commonly used coatings include plastics, epoxy resins, coal tar epoxy resins, and various glass-type anti-corrosion coating materials.

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