The so-called heat treatment refers to the process of heating and cooling the metal material properly to adjust the metal crystal form. Usually it includes quenching, annealing, tempering, normalization and other treatments. It is a work to change the mechanical properties of metals.

It is quite difficult to keep the metal from oxidizing during conventional heat treatment, because every metal above 600 degrees Fahrenheit will be oxidized when it contacts with oxygen. This will result in discoloration and weakening on the product. At present, in order to solve the problem of oxidation, the most method used in the industry is to add nitrogen in the heat treatment to replace the oxygen in the air, to ensure that the product is isolated from oxygen, so that the metal can not be oxidized after heat treatment, so as to achieve the ideal heat treatment effect. This method has high requirements on the purity of nitrogen gas and needs to be continuously supplied; the quality of the heat-treated metal can be guaranteed in this way.

Although there are more than one way of making industrial nitrogen at present, many manufacturers still choose PSA nitrogen production equipment to realize self-production and self-use of nitrogen; this is mainly because PSA nitrogen production equipment can supply high-purity nitrogen continuously for 24 hours , having good economy also, and saving a series of management problems associated with the purchase of bottled nitrogen , such as transportation, storage, and handling; it can be said to save money and worry. Therefore, it is a very good choice to use PSA nitrogen generator to solve the oxidation problem in heat treatment.