Thermal processing molds include hot forging molds, die-casting molds, and hot extrusion molds. Because they are heated by high-temperature metal during work, they need to maintain high strength and wear resistance at high temperatures.
In the usual heat treatment technical standards, hardness requirements are often stated, but other performance indicators are not clearly stated. Other performance indicators are only implicit under the premise of thermally processed molds. The realization of these indicators in the actual production process requires the control of the process.
During the heat treatment process, due to insufficient heating temperature and holding time, the alloy elements in the mold steel do not have enough austenite, and the quenched and tempered structure will suffer from insufficient tempering, insufficient high-temperature strength, poor red hardness, and cracks during the use of the mold, early cracking, deformation and other defects.
At present, in external processing cooperation, it is very common to use hardness as the standard for heat treatment of thermal processing molds. The production process needs to be controlled to ensure that the workpiece is fully insulated, and the heat treatment process is based on red hardness. It is not only considered that meeting the hardness requirements is a qualified mold.

Hot working dies include hot forging dies, die casting dies and hot extrusion dies. Because they are heated by high-temperature metals during work, they need to maintain high strength and wear resistance at high temperatures. So what are the reasons why hot work die steel is not durable?
In the general technical standards of heat treatment, the hardness requirements are often only stated, and other performance indicators are not put forward. Other performance indicators are only hidden in the premise of hot working dies. The realization of these indicators in the actual production process requires the control of the process.
In the process of heat treatment, due to insufficient heating temperature and holding time, the alloy elements in the die steel are not fully austenitic, and the quenching and tempering structure will have insufficient tempering, insufficient high-temperature strength, poor red hardness, mold cracking, early cracking, deformation and other defects in use.
At present, it is very common that the heat treatment of external processing cooperation takes hardness as the standard to heat treat hot working molds. The production process must be controlled to make the workpiece fully insulated. The heat treatment process should meet the red hardness as the standard. It can not be considered as a qualified mold only to meet the hardness requirements.
In addition, the hot work die steel die is used for the process of maintenance treatment during service, such as: after the die-casting die is used for some time, soft nitriding is supplemented; After using the die-casting die for a period of time, the stress should be removed below the tempering temperature; The forging die is used for stress relief treatment for a period of time.

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