What is stainless steel?
Stainless steel can maintain gloss in the air without rusting, because it contains a certain amount of chromium alloy elements (not less than 10.5%), which can form a strong oxide film on the surface of the steel that is insoluble in certain media.
After nickel is added, the performance of stainless steel is further improved. It has good chemical stability in air, water, and steam, and it has enough stability in many kinds of acid, alkali, and salt aqueous solutions, even at high temperatures or In a low temperature environment, it can still maintain its advantages of corrosion resistance.
The special feature of stainless steel is determined by two elements, which are chromium and nickel. Without chromium, there is no stainless steel, and the amount of nickel determines the value of stainless steel.
It is very simple. Just look at the steel model and you will know what materials can be used for food processing, containers, and tableware. Obviously, the national standard at that time basically directly recognized 304 steel as food grade stainless steel (stainless steel mug).