2. Food-grade stainless steel refers to the stainless steel material that meets the requirements of People's Republic of China (PRC) National Standard/Hygienic Standard for Stainless Steel Tableware Containers (GB4806.9-20 16), and its lead content is much lower than that of ordinary stainless steel.
Because the food production process uses a lot of acid and alkali, and stainless steel contains chromium, unqualified stainless steel will dissolve out chromium at various prices, which is toxic; It also limits the content of alloy impurity elements such as lead and cadmium.
The word "stainless steel" refers not only to one kind of stainless steel, but to 100 kinds of industrial stainless steel, and each developed stainless steel has good performance in its specific application field. The key to success is to find out the purpose first, and then determine the correct steel grade. There are usually only six kinds of steel related to the application field of building construction. They all contain 17 ~ 22% chromium, and the better steel also contains nickel. Adding molybdenum can further improve the atmospheric corrosivity, especially the corrosion resistance to chlorine-containing atmosphere.