Will the steel strap fade? What is the reason?

Generally speaking, the strap will not fade easily, but it will fade to a certain extent after being used for a long time. This requires regular maintenance. There are many kinds of stainless steel, the main components are nickel and chromium, and elements such as nickel and chromium are easily corroded by strong I acid and strong alkali. The sweat excreted by human body contains hydrochloric acid. When wearing a watch, if you are often exposed to sweat or let it accumulate acid, alkali and salt dirt without cleaning it in time, rust spots will slowly appear on the strap and black stains will also appear on your wrist.