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How to harden the mold steel
Jul 19, 2017

This is used to make steel mold mold material, and a part of which is in the production of mould die steel quenching indispensable, the purpose is to make the mold quality more reliable, the hardness and wear resistance are improved, die steel manufacturers about how hardened die steel.

Different die steels have different quenching methods. Quenching is to heat the workpiece and keep it cool quickly in the quenching medium such as water, oil or other inorganic salt and organic water solution. After quenching, the steel becomes hard, but becomes brittle at the same time. In order to reduce the brittleness of a steel member, the quenched steel member is subjected to prolonged heat insulation at a temperature higher than room temperature below 650 DEG C, and then cooled. This process is called tempering. Annealing, normalizing, quenching and tempering are four "fire" in the whole heat treatment, in which the quenching and tempering are closely related and often used together.

Heat treatment process generally includes heating, insulation, cooling three processes, and sometimes only heating and cooling two processes. These processes are interconnected and uninterrupted. Heating is one of the important processes of heat treatment. There are many heating methods for metal heat treatment. The first is to use charcoal and coal as heat sources, and then apply liquid and gas fuel. The application of electricity makes the heating easy to control without environmental pollution. These heat sources can be heated directly or indirectly by molten salts or metals, and even by floating particles.

When the metal is heated, the workpiece is exposed to the air, and oxidation and decarburization occur frequently (i.e., the surface carbon content of the iron and steel parts decreases), which has a detrimental effect on the surface properties of the parts after heat treatment. As a result, metals should be heated in a controlled atmosphere or atmosphere, molten salt and a vacuum, and may be protected by coating or packaging.

Heating temperature is one of the important process parameters of heat treatment process. The selection and control of heating temperature is the main problem to ensure the quality of heat treatment. The heating temperature varies with the purpose of the treated metal material and the heat treatment, but is generally heated above the phase transition temperature to obtain high temperature tissue. Another change will take some time, so when the metal surface to meet the requirements of the heating temperature, the temperature must be maintained for some time, inside and outside temperature, the microstructure change completely, this time called the holding time. When using high energy density heating and surface heat treatment, the heating speed is very fast, and generally there is no holding time, but the heat treatment time is longer.

Cooling is also an indispensable step in the process of heat treatment. The cooling method is mainly controlled by the cooling rate due to the different process. The cooling rate of the general annealing is the slowest, the normalizing cooling rate is faster, and the quenching cooling speed is faster. But also because different types of steel have different requirements, such as empty hard steel can use the same normalizing the cooling speed of quench.

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