Hangzhou square tube is a kind of hollow long steel, because the section is square, it is called square tube. A large number of pipelines are used to transport fluid, such as oil, natural gas, water, gas, steam, etc. in addition, when bending and torsional strength are the same, the weight is lighter, so it is also widely used to manufacture mechanical parts and engineering structures.
Properties of stainless steel square tube
Metal can react with oxygen in the atmosphere to form oxide film on the surface, and the iron oxide formed on the common carbon steel will continue to oxidize, so that the corrosion will continue to expand, and finally form holes.
This can be done by using paint or oxidation-resistant metal plating to protect the carbon steel surface, but this kind of protective layer is only a thin film, if the protective layer is damaged, the steel below will start to rust again.
The corrosion of stainless steel pipe is related to the chromium content of steel. When the chromium content of steel reaches 12%, it is not easy to be corroded. The chromium content of xiyouwo 201 stainless steel pipe is more than 13%, and that of 304 stainless steel pipe is more than 18%.
In the atmosphere, a layer of passivated and dense chromium rich oxide is formed on the surface of stainless steel pipe to protect the surface and prevent further reoxidation.
This kind of oxide layer is very thin, through which we can see the natural luster of the steel surface, so that stainless steel has a unique surface.
If the chromium film is destroyed, the chromium in steel and oxygen in the atmosphere will form a passive film again, which will continue to play a protective role.
In some special environments, stainless steel will also have some local corrosion and failure, but unlike carbon steel, stainless steel will not have uniform corrosion and failure, so the corrosion allowance is meaningless for stainless steel pipes.
Advantages of stainless steel square tube
The stainless square tube is widely used, of course, for some reasons. The main reason is that it has a long service life, good corrosion resistance, light self weight, but great strength. It reduces the load of the product, increases its bearing capacity, and makes consumers feel more comfortable using it.