Is it true that stainless steel water cups won’t rust?

Regarding the rust problem ofstainless steel water cups, the editor has made many explanations from different perspectives in previous articles, including that 201 stainless steel cannot be used in the production of water cups, especially the inner liner of water cups, because 201 Stainless steel is not food grade, and 201 stainless steel will rust, etc. So why is the editor writing this content again today? Is the content still the same? Answer: No. So is the stainless steel water cup really not rusty?

The food-grade stainless steel currently on the market that can be used for the production of stainless steel water cups is 304 stainless steel and 316 stainless steel. Due to their stable structure and high-quality safety indicators, these two stainless steels are used in water cups and stainless steel products for people's daily lives. Usually we are talking about Stainless steel water cups will not rust once 304 stainless steel and 316 stainless steel are used. This simple explanation is no problem, but it cannot be said that these two types of stainless steel will definitely not rust.

The reason why stainless steel will not rust is due to a special material ratio so that stainless steel has strong corrosion resistance. However, it cannot be said that stainless steel will not rust in any environment, even food-grade 304 stainless steel and 316 stainless steel. Water cups and other daily necessities made of these two types of stainless steel cannot be immersed in highly acidic and alkaline drinks for a long time, nor can they be used in environments with high salt concentrations for a long time. Both of these situations will cause corrosion of the 304 stainless steel and 316 stainless steel cups, which may cause minor damage. In some cases of corrosion, the product begins to turn black, and in severe cases, the surface of the material begins to corrode and fall off.

The reason why stainless steel will not rust is due to a special material ratio so that stainless steel has strong corrosion resistance. However, it cannot be said that stainless steel will not rust in any environment, even food-grade 304 stainless steel and 316 stainless steel. Water cups and other daily necessities made of these two types of stainless steel cannot be immersed in highly acidic and alkaline drinks for a long time, nor can they be used in environments with high salt concentrations for a long time. Both of these situations will cause corrosion of the 304 stainless steel and 316 stainless steel cups, which may cause minor damage. In some cases of corrosion, the product begins to turn black, and in severe cases, the surface of the material begins to corrode and fall off.

But in our daily lives, these two types of environments are rarely encountered. Therefore, as long as stainless steel water cups are made of 304 stainless steel and 316 stainless steel, you can still use them with confidence. At the same time, when stainless steel water cups are sold, there are usually some usage tips, such as not to hold carbonated drinks for a long time.