Influence of heat treatment on properties of STSi11Cn2CrR wear-resistant cast steel for large mining machinery
Heat treatment of steel consists of heating the material up to different temperatures and cooling it afterwards in different methods. This process can be divided into four categories – hardening, annealing, tempering and normalizing. Each heat treatment process has its own advantages and limitations.
Hardening is done by bringing the steel to a high temperature and rapidly cooling it in order to increase its hardness. This process is typically used on alloys that are difficult to work, such as STSi11Cn2CrR wear-resistant cast steel. Annealing, on the other hand, is the process of heating the steel to a lower temperature and slowly cooling it in order to reduce its hardness. This process is typically used to improve machinability and ductility.
Tempering is another heat treatment process that is used to reduce the tendency of the steel to become brittle. It is typically done after the steel has been hardened by annealing or hardening process. Tempering helps improve the toughness of the steel and increases its mechanical properties like fatigue strength, ductility and resistance to wear.
Normalizing is a form of heat treatment which involves heating the steel to its critical point and cooling it in still air. It is usually done to reduce residual stresses and improve the homogeneity and balance of the steel’s microstructure. Normalizing is a relatively simple heat treatment process that helps reduce the possibility of cracking and distortion of the parts during or after fabrication.
The effect of heat treatment of STSi11Cn2CrR wear-resistant cast steel is shown in Figure 1. During the hardening process, the steel is heated to a high temperature and cooled rapidly to achieve improved hardness and strength.
Annealing, on the other hand, involves heating the steel to a lower temperature and cooling it slowly. This process is typically used to improve machinability, ductility and other mechanical properties of the steel.
Tempering helps improve the toughness of the steel and increases its mechanical properties like fatigue strength and resistance to wear. Normalizing reduces residual stresses and improves the homogeneity of the steel's microstructure.
In conclusion, heat treatment of STSi11Cn2CrR wear-resistant cast steel for large mining machinery is essential for its long-term performance. This process involves hardening, annealing, tempering and normalizing and helps improve the hardness, strength and wear resistance. It also has a positive effect on dimensional stability and corrosion resistance.
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