Structure: The water through cooling device is mainly composed of moving trolley, water through cooling device, by-pass roller table and main water supply pipe.
Principle: Use the residual heat of steel bar after rolling for quenching and tempering heat treatment, that is, the hot rolled steel bar in the austenitic state after rolling quickly cooling, so that the surface of the steel bar quenched to form martensite, and then rely on the residual heat released by the heart of the self-tempering, so that martensite into fine grain sotensite, improve strength and plasticity. The factors that determine the mechanical properties of the steel bar, especially the tensile strength, are the size of the volume occupied by the martensite ring, the tensile strength of the martensite and the tensile strength of the central part of the ferrite. The amount of martensite is closely related to the tempering temperature after water cooling.
In the production of conventional bars, the temperature of the rolled parts after the finished mill reaches 1050℃, and the heat of the high temperature rolled parts is lost in the subsequent cooling process. Water cooling after rolling is to use the waste heat to refine the structure of steel and strengthen the mechanical properties of steel, so as to improve the comprehensive properties of steel. The application of this technology in rod and wire production is also an important sign to measure the equipment level and control technology of bar mill. The essence of this technology is to use the residual heat after rolling to implement the re-quenching and tempering treatment of the mark. The mechanism is to use the residual heat of the steel after rolling through water to cool the steel bar quickly after rolling, so that the surface of the steel bar to form a hardened structure, that is, martensite, bainite and other hardened structures; In the subsequent controlled cooling, the heat of the core is released, and the quenched tissue uses its own waste heat to self-temper, so that martensite and bainite are eventually transformed into a fine-grained and uniform tempered sorbite or fine pearlite + ferrite, while the core and surface temperature tend to be consistent in the process of the central austenite structure to form pearlite + ferrite to improve the mechanical properties of the product.
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