Applications and Characteristics of Spiral Welded Steel Pipes

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2021-05-16

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Spiral welded steel pipes are widely used in various structural components, tools, and machine parts. Compared with circular pipes, shaped pipes typically exhibit larger moments of inertia and section moduli, as well as greater resistance to bending and torsion, thereby significantly reducing structural weight and saving steel.

　　First, what are the main application areas of spiral steel pipes?

　　1. Spiral steel pipes are widely used in various structural components, tools, and machine parts. Compared with circular pipes, shaped pipes typically have a larger moment of inertia and section modulus, as well as greater resistance to bending and torsion, which can significantly reduce structural weight and save steel.

　　2. Spiral steel pipes can be classified into elliptical spiral steel pipes, triangular spiral steel pipes, hexagonal spiral steel pipes, diamond‑shaped spiral steel pipes, octagonal spiral steel pipes, semi‑circular special‑shaped steel pipes, unequal‑hexagon spiral steel pipes, five‑lobed steel pipes, plum‑blossom‑shaped spiral steel pipes, double‑convex spiral steel pipes, double‑concave spiral steel pipes, melon‑seed‑shaped spiral steel pipes, conical spiral steel pipes, and corrugated spiral steel pipes.

　　3. Spiral welded steel pipes are manufactured from round steel, so they have no weld seam. Because they can withstand higher pressures, they are commonly used in the chemical and gas‑transport industries. Welded steel pipes are produced by welding strip steel on a high‑frequency welding machine, resulting in a weld seam on the inner wall (often referred to as an internal rib). They are typically used for scaffolding and structural piping. Galvanized steel pipes are made by hot‑dip galvanizing welded steel pipes—that is, zinc is melted in a zinc bath, the steel pipe is immersed in the molten zinc for a period of time, then cooled and dried. The zinc coating adheres to both the inner and outer surfaces of the steel pipe.

　　Second, what are the characteristics of spiral steel pipe diameters?

　　1. Spiral welded steel pipes are typically used for conveying low-pressure fluids (such as water or liquefied gas), and their outer diameter is usually denoted by D or Ф. Generally, the diameter of a spiral welded steel pipe can be classified into outer diameter, inner diameter, and nominal diameter. The notation methods can be divided as follows: the outer diameter of a spiral welded steel pipe is indicated by the letter D, followed by the specific outer diameter value and wall thickness; for example, a spiral welded steel pipe with an outer diameter of 108 mm and a wall thickness of 5 mm would be denoted as D108 × 5. Plastic pipes also use the outer diameter to indicate size, such as De63.

　　2. Other types, such as reinforced concrete pipes, cast-iron pipes, and galvanized steel pipes, are designated by DN. In design drawings, the nominal diameter is typically used. The nominal diameter is an artificially established standard intended to facilitate design, manufacturing, and maintenance. Diameter is the specification designation for spiral-welded steel pipes (or pipe fittings). The nominal diameter of a spiral-welded steel pipe does not correspond to its inner or outer diameter.

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