The stainless steel square tube is a hollow strip of steel, which is called a square tube because the section is square. It is widely used as a pipeline for transporting fluids, such as petroleum, natural gas, water, gas, steam, etc. In addition, it is light in weight when it is bent and has the same torsional strength, so it is also widely used in the manufacture of mechanical parts and engineering structures.
Stainless steel square tube classification: square tube is divided into two categories: seamless steel pipe and welded steel pipe (with seam pipe). According to the shape of the section, it can be divided into square and rectangular tubes. Circular steel tubes are widely used, but there are also some special-shaped steel tubes such as semicircular, hexagonal, equilateral triangle and octagonal.
For stainless steel square pipes subjected to fluid pressure, hydraulic tests shall be carried out to test their pressure resistance and quality. No leakage, wetting or expansion shall occur under the specified pressure. Some steel pipes shall be rolled according to the standard or the requirements of the purchaser. Side test, flare test, flattening test, etc.