Stainless steel is a mixture of steel and at least 11% chromium. It would be highly impractical for the average user to try to make this; most people simply don't have the equipment.
If you want something similar, you should investigate electroplating. Electroplating is done by putting the object you want to coat in a little bit of salt water, along with the source material (such as nickel). Attach the negative end of a battery to the source material and the positive end to the object you want to coat. Material will start coming off the source and coating your object.