Factors affecting the thickness of the head of hot-rolled strip

The factors affecting the thickness of the head of hot-rolled strips mainly include a cooling method, decarburization process, strip width and cutting method, material properties, process parameters, equipment status and adjustment, etc.

1. Cooling method

The cooling method refers to controlling the temperature and cooling rate of the head of the strip through different cooling methods. It plays a vital role in controlling the thickness of the head of the hot-rolled strip. When selecting the cooling method, multiple factors should be considered comprehensively. Not only the thickness of the head should be paid attention to, but also the surface quality and cost should be considered. Only by selecting the cooling method according to the standard operating procedures and combining the material characteristics, process parameters and equipment status can the ideal control effect of the thickness of the head of the hot-rolled strip be obtained.

 

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2. Decarburization process

The main purpose of the decarburization process is to change the structure and properties of steel by controlling the carbon content in the steel. The selection of the decarburization process depends on many factors, such as the chemical composition of the steel, decarburization requirements, production efficiency and cost. Different decarburization processes have different advantages and limitations. Even if they are the same decarburization process, different steel manufacturers may choose different methods. Although the decarburization process has an important influence on the control of the head thickness of the hot-rolled strip, the decarburization process itself cannot directly control the head thickness. It mainly affects the structure and properties of the steel, and then affects the formation of the head thickness.

Therefore, when studying the head thickness of a hot-rolled strip, it is necessary to comprehensively consider the relationship between the decarburization process and other factors. The optimization of the decarburization process may need to cooperate with other process parameters and material properties to achieve precise control of the head thickness. In addition, the improvement of the decarburization process also needs to comprehensively consider factors such as production cost, energy consumption and environmental impact.

3. Strip width and cutting method

Strip width and cutting method have an important influence on the thickness of the head of hot-rolled strip. Strip width refers to the lateral dimension of the strip, which has a certain relationship with the head thickness. In terms of strip width, wider strips have a larger surface area during hot rolling, so the heat transfer is relatively faster, which may lead to uneven temperature distribution at the head of the strip, thus affecting the consistency of the head thickness. In addition, wider strips will also be deformed to varying degrees during the cooling process, further affecting the accuracy and stability of the head thickness.

As for the cutting method, it involves the operation of cutting the hot-rolled strip into the required size. The choice of cutting method has a direct impact on the head thickness. On the one hand, different cutting methods may lead to inconsistent shapes of the cutting surface, especially at the edges, which may cause unevenness of the head thickness. On the other hand, the cutting method also affects the quality and flatness of the cutting surface. If the cutting surface is not smooth or has burrs, it may cause changes in the head thickness or unsatisfactory cut quality.

 

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4. Effect of other factors on the head thickness of the hot-rolled strip

The factors affecting the head thickness of hot-rolled strips are very complex, including material properties, process parameters, equipment status and adjustment, etc. The interaction of these factors will have a significant impact on the head thickness.

Material properties are one of the important factors that determine head thickness. The chemical composition and physical properties of different materials vary greatly. For example, steel with high carbon content is more likely to produce changes in head thickness during hot rolling. Differences in microstructure will also lead to variations in head thickness. Different grain sizes, phase change behaviours and grain boundary characteristics will affect the plastic deformation and resilience of steel.

The influence of process parameters on head thickness cannot be ignored. Hot rolling temperature, rolling force, rolling speed and rolling roll arrangement will have direct or indirect effects on head thickness. Higher rolling temperatures can improve the plasticity of steel, but it is also easy to cause excessive head thickness. The increase in rolling force and speed will increase the degree of deformation, which will affect the head thickness. In addition, a reasonable roll arrangement can improve the uniformity of steel and reduce the variation of head thickness.

Equipment status and adjustment also have an important impact on head thickness. Wear and poor shape of the roll system will lead to uneven distribution of pressing force, which in turn affects the consistency of head thickness. Good roll system adjustment and control can reduce this impact. In addition, adjustment of pressing force and bending roll control also plays an important role in controlling the uniformity of head thickness.

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