Stainless Steel refers to steel with a chromium content of at least 10.5% and a maximum carbon content of no more than 1.2%, according to GB/T20878-2007, which stipulates that stainless steel and corrosion resistance are the main characteristics.

Stainless steel is a type of steel that is resistant to weak corrosive media such as air, steam, water, etc. or is stainless. Steel types that are resistant to chemical corrosive media (chemical corrosion such as acids, alkali, salts, etc.) are 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 corrosion by chemical media, while acid-resistant steel is generally stainless. "Stainless steel" workpieces not only refer to a kind of stainless steel, but represent more than one hundred industrial stainless steels, so the stainless steels developed have good performance in their specific application fields. The key to success is to first understand the application and then determine the correct steel grade. There are usually only six types of steel relevant to building construction applications. They all contain 17 to 22% chromium, and the better steel types also contain nickel. Adding molybdenum can further improve atmospheric corrosion, especially corrosion resistance in chloride-containing atmospheres.

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