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what is stainless steel square pipe?

Date:Jul 21, 2019

The stainless steel square pipe is a hollow long strip of steel, which is called a square tube because the section is square. It is widely used as a pipeline for conveying fluids, such as petroleum, natural gas, water, gas, steam, etc. In addition, it has a light weight when it is the same in bending and 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.

Production process: round steel preparation → heating → hot rolling perforation → cutting head → pickling → grinding → lubrication → cold rolling processing → degreasing → solution heat treatment → straightening → pipe cutting → pickling → finished product inspection.

Performance analysis:

Whether the stainless steel tube is corroded is related to the chromium content in the steel. When the chromium content in the steel reaches 12%, in the atmosphere, a layer of passivated, dense chromium-rich oxide is formed on the surface of the stainless steel tube to protect the surface. Further reoxidation. This oxide layer is extremely thin, through which you can see the natural luster of the steel surface, giving the stainless steel a unique surface. If the chromium film is destroyed, the chromium in the steel and the oxygen in the atmosphere re-form the passivation film and continue to protect.

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