Due to the development and improvement of the output and technical level of China’s steel industry, the demand and standard of the steel market are also improving, which makes some high-quality steel materials emerge as the times require. Compared with other materials, iron and steel materials have better resource abundance. Because of the simple production and processing, and the controllable cost and performance, iron and steel materials are hard to replace. In the development of economy and society, the needs of “good performance, low cost, easy processing, high precision and green” are put forward. It is urgent to develop advanced steel to meet the above needs.
Stainless steel generally refers to alloy steel with Cr content greater than 11.7% or Ni content greater than 8%. 2Crl3 is a typical martensitic stainless steel material. Generally, martensitic stainless steel with martensitic structure is used. According to different grades of steel and different mechanical property requirements, the appropriate process specifications can be selected. Only after a proper series of heat treatment can the required structure and properties be obtained. Under the heat treatment system, the classical process method based on quenching and tempering is also an important means for strengthening the initial strength of martensitic stainless steel. After consulting relevant data, the appropriate quenching temperature should be selected according to the size and shape of the parts and the equipment conditions.
2Crl3 stainless steel has the advantages of strong corrosion resistance, excellent shock absorption and good hardenability. It is applied in many fields such as medical treatment, locomotive and military industry, which makes high-quality 2Crl3 steel become a focus of attention. 2013 with high strength and super toughness has become a need and guarantee. However, the carbon content in 2013 is relatively low. In order to achieve good performance parameters, in addition to qualified chemical composition, appropriate heat treatment must be carried out to obtain stable and fine uniform structure. The strengthening process is mostly quenching and tempering treatment. First, quenching is carried out to obtain martensite structure with high hardness, and then high-temperature tempering treatment is carried out, The aim is to obtain fine tempered sorbite phase.
Due to the change of the structure of the material itself and the influence of the heat treatment temperature, the high-temperature quenched structure obtains martensite and avoids the appearance of undissolved ferrite. Although the strength and hardness will become very high, if the heating temperature is too high, the structure phase is single and the size is large, and the initial property of the steel will be affected, In order to have both better hardness and better toughness to obtain the characteristics of strengthening and toughening, the sub temperature quenching process is usually used, which is a new type of strengthening and Toughening Heat treatment process.