What is Stainless Steel

Stainless steel is defined according to GB/T20878-2007 as a steel with stainless steel and corrosion resistance as the main characteristics, and the chromium content is at least 10.5%, and the carbon content is not more than 1.2%.

Stainless steel is the abbreviation of stainless acid resistant steel, and the steel grade that is resistant to weak corrosive media such as air, steam, and water or has stainless steel is called stainless steel; The steel that is resistant to chemical corrosion media (acid, alkali, salt and other chemical corrosion) is called acid-resistant steel.

Due to the difference in chemical composition between the two, their corrosion resistance is different, ordinary stainless steel is generally not resistant to chemical corrosion, while acid-resistant steel is generally stainless steel. The term "stainless steel" does not simply refer to one type of stainless steel, but to more than a hundred industrial stainless steels, each developed with good performance in its specific application area. The key to success is to first understand the use and then determine the right steel grade. There are usually only six types of steel that are relevant to the construction of buildings. They all contain 17~22% chromium, and the better steel grades also contain nickel. The addition of molybdenum can further improve atmospheric corrosivity, especially resistance to chloride-containing atmospheres.

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