Hot-dip galvanized octagonal tube, octagonal shaped welded tube, non-standard octagonal pipe Special-shaped seamless steel tubes are generally differentiated by their cross-sections, and can be further categorized by material into seamless steel tubes, aluminum alloy special-shaped seamless tubes, and plastic special-shaped seamless tubes. Below, we mainly introduce the special-shaped seamless steel tubes.
  Alloy seamless steel tubes refer to seamless steel tubes with cross-sectional shapes other than circular.
  According to the different shapes and sizes of steel pipe cross-sections, they can be further categorized into equal wall thickness non-standard seamless steel pipes (code:D)、Unsymmetrical-thickness, Non-standard Seamless Steel Pipe (code: )BDS, Variable Diameter Non-standard Seamless Steel Pipe (Code: S)BJ）。
  Oval seamless steel tubes are widely used in various structural components, tools, and mechanical parts. Compared to round tubes, oval seamless steel tubes generally have a larger moment of inertia and section modulus, offering greater bending and torsional resistance. This can significantly reduce the weight of the structure and save on steel.