321 Stainless steel square tube Description

Stainless steel square tube is a hollow strip of steel, because the cross-section is square so called square tube. A large number of pipelines used to transport fluids, such as oil, natural gas, water, gas, steam, etc., in addition, in bending, torsional strength at the same time, light weight, so it is also widely used in the manufacture of mechanical parts and engineering structures.

With the continuous development of modern industry, various metal materials have been widely used in construction, furniture, automobiles, electronics and other fields. In this process, stainless steel square pipe, as a high-quality metal material, has gradually been favored by people

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.

Metals in the atmosphere can react with oxygen to form an oxide film on the surface, and the iron oxide formed on ordinary carbon steel will continue to oxidize, so that the rust continues to expand and eventually form holes. This can use paint or oxidization-resistant metal plating to protect the surface of carbon steel, but this protective layer is only a thin film, if the protective layer is destroyed, the underlying steel will begin to rust again. Whether the stainless steel pipe is corroded is related to the chromium content in the steel, when the chromium content in the steel reaches 12%, in the atmosphere, the surface of the stainless steel pipe generates a layer of passivated and dense chromium-rich oxide to protect the surface, which can prevent further reoxidation. This oxide layer is extremely thin, through which you can see the natural luster of the steel surface, giving 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, which continues to play a protective role. In some special environments, stainless steel will also have some local corrosion and failure, but stainless steel and carbon steel, there will be no uniform corrosion and failure, so the corrosion margin is not meaningful for stainless steel pipes.

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