Sub-zero heat treatment method of steel

摘要

A heat treatment method, of steel is capable of enhancing wear resistance, mechanical properties and dimensional stability of the steel due to the reduction of the retained austenite amount to substantially zero. In the method, an article of the steel is subjected to a quenching and then subzero treatment including cooling it at a cooling rate of 1 to 10 DEG C /min. to a cooling temperature and holding the cooling temperature for a predetermined period of time.