Why stainless steel will also rust? Is this true? - - - - - - Precision stainless steel - Spring stainless steel belt | | 301 superhard stainless stainless steel spring

When the stainless steel surface appear brown rusty spot ( Point) , big surprised: people think 'stainless steel does not rust, rust, it is not stainless steel, is likely to be out of the question of steel'. Actually, this is a one-sided error for a lack of understanding of stainless steel. Stainless steel under certain conditions will be rusty tags: why would rust stainless steel precision stainless steel