Die steel R12 is a high-carbon high-alloy tool steel with excellent wear resistance and impact resistance. In order for it to have a high hardness, it needs to be quenched. The quenching process of die steel R12 and the factors affecting the quenching hardness will be introduced in detail below.
Quenching is the process of changing the microstructure of steel by rapid cooling, thereby increasing its hardness and strength. The quenching process of die steel R12 generally includes three steps: heating, heat preservation and cooling.
The first is heating. The heating temperature of die steel R12 is generally between 800 -1000, and the specific temperature depends on the composition of the steel and the required hardness. When heating, it is necessary to maintain uniform heating to avoid overheating or overheating.
Next is insulation. The holding time is generally 30 minutes to 1 hour to ensure that the temperature of the steel is evenly distributed and that it achieves a uniform austenitic structure.
Finally, there is cooling. The cooling rate is one of the key factors affecting the hardness of quenching. The cooling rate of die steel R12 is generally required to be fast in order to make the steel quickly change from austenitic to martensitic. Commonly used cooling media are water, oil, and gas. Water cools the fastest, but is prone to deformation and cracking; The oil cooling rate is moderate, which can better control deformation and cracking; Gas cooling is the slowest and is suitable for situations where deformation and cracking are required.
In addition to the quenching process, there are other factors that also affect the quenching hardness of the die steel R12.
The first is the composition of steel. The composition of die steel R12 contains high carbon and alloying elements, which are able to increase the hardness of steel. At the same time, a reasonable alloy ratio can also improve the hardenability and wear resistance of the steel.
The second is the heating temperature and the holding time. Heating too high a temperature or holding too long can cause the grain growth of the steel, which can reduce the hardness. Therefore, it is necessary to choose the appropriate heating temperature and holding time according to the specific situation.
In addition, the choice of cooling medium and the cooling rate also have an impact on the hardening hardness. Different cooling media have different cooling rates, and it is necessary to select the appropriate cooling medium according to the specific requirements.
In addition, the pretreatment of the die steel R12 will also have an impact on the quenching hardness. Before quenching, annealing can be performed to eliminate internal stresses and improve the machinability of the steel.
In short, the high quenching hardness of die steel R12 needs to be comprehensively considered by many factors, including the quenching process, the composition of the steel, the heating temperature and holding time, the cooling medium and the cooling rate. Through reasonable process and control, die steel R12 with high hardness and excellent performance can be obtained. Mould Steel King and Peace Mould Steel Mould Steel.