Heat treatment of stainless steel pipe fittings. The heat treatment of stainless steel pipe fittings is to change its physical properties, mechanical properties, residual stress and restore the corrosion resistance affected by previous processing, so as to obtain the good performance of stainless steel or enable stainless steel to withstand further high and low temperature processing. The so-called heat treatment is the corresponding annealing, quenching, tempering, normalizing and other related treatments for different structures and types of stainless steel.
According to the structure, stainless steel can be divided into austenitic stainless steel, martensitic stainless steel and ferritic stainless steel. In order to avoid surface deformation of stainless steel during heat treatment, the heat treatment of these three types of stainless steel is different based on their respective structures and characteristics.
Meiya stainless steel pipe fittings - heat treatment
1. Heat treatment of austenitic stainless steel pipe fittings
Austenitic stainless steel is widely used and widely used. It is characterized by austenite structure without phase transformation at room temperature, which can not be hardened by heat treatment, but can be hardened by cold work. The common heat treatment method is solid solution treatment.
2. Heat treatment of ferritic stainless steel pipe fittings
Ferritic stainless steel fittings usually do not have ν-α Phase transformation is a ferrite structure without phase transformation at high temperature and normal temperature. However, when the steel contains a certain amount of austenite forming elements such as carbon and nitrogen, austenite structure will also be formed at high temperature. This steel cannot be strengthened by heat treatment, but can only be annealed to eliminate internal stress and promote further surface treatment.
3. Heat treatment of martensitic stainless steel pipe fittings
Martensitic stainless steel pipe fittings have obvious transformation point, which is austenitic structure at high temperature, and martensitic transformation occurs when cooling, so as to transform into martensitic structure and harden. Since this type of stainless steel contains high chromium and has good hardenability, a variety of heat treatment methods, such as quenching and tempering, can be used.
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