How long can stainless steel be guaranteed not to rust?

Normal use is at least 5 years, depending on what kind of environment the stainless steel is used in. For example, 304 has good rust resistance in a dry and clean atmosphere, but it will rust in coastal areas. In addition, the damage to the surface protective film of stainless steel can also cause rust. Therefore, the stainless steel surface must be cleaned frequently to remove the deposits.