About Stainless Steel

Stainless Steel (Stainless Steel) according to the definition of GB/T20878-2007 is stainless, corrosion resistance as the main characteristics, and the chromium content of at least 10.5%, carbon content of maximum not more than 1.2% steel.

Stainless Steel (Stainless Steel) is short for stainless acid-resistant steel, air, steam, water and other weak corrosion medium or stainless steel; And the chemical corrosion resistant medium (acid, alkali, salt and other chemical etching) corrosion of steel called acid resistant steel.
Because of the difference between the two in the chemical composition and their corrosion resistance is different, ordinary stainless steel is generally not resistant to the corrosion of chemical media, and acid-resistant steel is generally stainless. The word "stainless steel" does not simply refer to a kind of stainless steel, but means more than one hundred kinds of industrial stainless steel, each stainless steel developed has good performance in its specific application field. The key to success is first to find out the purpose, and then to determine the right kind of steel. There are usually only six types of steel related to the application field of building construction. They all contain 17 to 22 percent chromium, and the better steels also contain nickel. The addition of molybdenum can further improve the corrosion of atmosphere, especially the corrosion resistance of the atmosphere containing chloride.

In general, the hardness of stainless steel is higher than that of aluminum alloy, the cost of stainless steel is higher than that of aluminum alloy.

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Stainless steel is often divided into: martensitic steel, ferritic steel, austenitic steel, austenitic ferritic (two-phase) stainless steel and precipitation hardening stainless steel, etc. In addition, according to the composition can be divided into: chromium stainless steel, chromium nickel stainless steel and chromium manganese nitrogen stainless steel. There are special stainless steel for pressure vessels "GB24511_2009_ pressure equipment with Stainless Steel Plate and steel belt".

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Most of the requirements are to maintain the original appearance of the building for a long time. In determining the type of stainless steel to be selected, the main consideration is the required aesthetic standards, the corrosion of the location of the atmosphere and the cleaning system to be used. However, other applications increasingly seek only structural integrity or impermeability. For example, the roofs and side walls of industrial buildings. In these applications, the owner's cost of construction may be more important than aesthetics, even if the surface is not very clean. 304 stainless steel works quite well in dry indoor environments.