A stainless steel laser can be marked black with a semiconductor laser marking machine. The speed of marking is low, and it can be done with high frequency. The depth of color is also related to the size of the current.
The laser marking stainless steel is not easy to remove, and the marking is clear and fine, which is widely used in all walks of life.
The laser marking stainless steel get rusty because of the large laser power, resulting in high temperature and oxidation, which can try to reduce the laser power to handle.
If it is a normal marking, a vector drawing such as the logo of a company, it only needs to lose focus on the laser. It is not to have the maximum laser light intensity to be engraved (this is a positive coke printing), it can be deviated from about 2 mm, after the engraving, it will not break the protective film on the stainless steel surface, so it will not rust.