Heat treatment process generally includes heating, heat preservation, cooling three processes, sometimes only heating and cooling two processes.These processes are interconnected and uninterruptible.
Heating is one of the important steps of heat treatment.There are many heating methods for metal heat treatment, * early is the use of charcoal and coal as a source of heat, and then the application of liquid and gas fuel.The application of electricity makes heating easy to control and free from environmental pollution.These sources of heat can be heated directly or indirectly through molten salts or metals, or even floating particles.

Stainless steel pipe now more and more widely used, due to its good corrosion resistance has played a vital role in engineering construction, in the process of production we need a solid solution for stainless steel tube processing, the main purpose is to obtain certain martensite increase the hardness of products, let's look at the solution of the stainless steel tube processing: