Introduction
Oil hardening and tempering of silicon manganese alloy spring steel wire(YB/T5104-1993) is a process of heat treatment of wire. As an important part of the manufacturing process, heat treatment has an important influence on the performance of steel wire. During the heat treatment process of spring steel wire, in addition to such intermediate steps as quenching and tempering, an important step is oil or liquid medium hardening and tempering, which is also the focus of this article.
Oil hardening and tempering mechanism
The oil quenching and tempering process of YB/T5104-1993 silicon manganese alloy spring steel wire is a thermo-mechanical process of heating and cooling, which changes the microstructure of the steel wire and improves the mechanical properties. In the heat treatment of silicon manganese alloy spring steel wire, this process can be divided into three steps: heating, oil quenching, and tempering.
In the heat treatment of steel wire, we often need to perform heating and oil quenching operations. The heating can be divided into two parts: annealing and pre-quenching. The purpose of annealing is to refine the grain of the steel wire, completely decompose the original austenite phase, and generate a more uniform prior austenite phase. The purpose of pre-quenching is to obtain a more stabilized prior austenite phase and make the steel wire more suitable for the following oil quenching process.
After heating, the steel wire can be heated to the required temperature for oil quenching. Oil quenching is a process of rapidly cooling the steel wire from a high temperature in oil so that the austenite existing in it can be transformed into a matrix structure mainly composed of martensite.
At this time, it can also weaken the strength of the steel wire and make the steel wire achieve a certain ductility. After that, tempering can be carried out, which can relieve residual stress in the steel wire and stabilize the structure of the steel wire.
Effect of quenching and tempering process
The purpose of the quenching and tempering process of the YB/T5104-1993 silicon manganese alloy spring steel wire is to achieve the ideal comprehensive mechanical properties of the steel wire, that is, the hardness, strength and toughness of the steel wire.
The impact of heat treatment on the properties of steel wire is mainly manifested in the following aspects:
First, it can significantly improve the strength, hardness, ductility and fatigue life of the steel wire, making the steel wire more wear-resistant, corrosion-resistant and stronger.
Second, it can improve the elasticity and toughness of the steel wire, making it easier to form and maintain a certain shape under the action of an external force.
Third, it can make the microstructure of the steel wire more uniform and stable, and improve the life of the steel wire.
Conclusion
In summary, oil hardening and tempering is an important heat treatment process for spring steel wire, which can effectively improve the mechanical properties of the steel wire and make it more suitable for the production and application environment. Although oil hardening and tempering can provide certain improvements to the mechanical properties of steel wire, it should be noted that proper parameters must be selected in actual production to ensure the best results.
