In temperature variation stability heat treatment method of the work piece which consists of the steel

摘要

This invention stability regards the method of heat-treating the work piece which consists of the steel in temperature variation. According to the method due to this invention, after only processing processing the work piece mechanically electrochemistry, it makes harden and deviation from to passivity converts. For example as for the said hardening, before the nitriding in order not to need the deviation from passivity conversion which is due to pickling, it consists of restoration process, desirable surface state is formed for gradual nitriding with that in hardening process.