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The post-heat treatment of forging work rolls of tandem cold rolling mills in forging plants is the surface quenching treatment of the roll body. In order to ensure its excellent performance, it is necessary to control the structure, hardness gradient and residual stress distribution of the hardened layer during the final heat treatment. In order to achieve the desired effect, it is necessary to strengthen research in metallurgy and technology. Forgings have high heat treatment quality requirements and excellent microstructure. The structure of the quenched layer is martensite + a small amount of remaining austenite + granular carbides. The desired group structure is cryptocrystalline martensite or fine needles. The absence of large acicular martensite increases the brittleness of the hardened layer. The surface must be solid. High strength is the guarantee of wear, but it should not be too high. The hardness level should be reasonably selected according to the operating conditions of the mill.
The hardness distribution of the forgings of the forging manufacturer is relatively reasonable. In order to ensure the requirement of effective hardening depth, the forge manufacturer has extended the service life of the roller. The selection of deep hardened layer rolls can reduce the heavy quenching consumption of unstable cold tandem mills. Below the hardened layer there should be a smooth transition layer to support the hardened layer. The rationale for the stress distribution remains. After surface hardening and low temperature tempering, it is necessary for the roll to have a large residual stress. The cold rolling work roll has a great influence on the contact fatigue life. During the rolling process, there must be residual tensile stress in the center of the roll. During forging, the peak tensile stress should not be too large. In order to achieve the above process policies, Dongguan forgings can be divided into overall rapid heating and induction heating according to different heating methods. Now, with induction heating as the main method, there are various process models, each of which is a complete set of equipment and technical systems.
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