High Building Z-direction Steel

Factors and solutions of cold rolling spread in Gaojian steel

In the cold rolling process of Gaojian steel, there will be a problem of large spread, and because the spread is too large, Gaojian steel can not meet the needs of users for various sizes, forming scrapped Gaojian steel, causing great harm. Then, the main factors affecting the cold rolling spread of Gaojian steel are that the metal volume flowing in the height direction is the source and one of the main factors to form the spread, and the spread increases with the increase of reduction. The aspect resistance ratio of rolled piece deformation in the deformation zone is also an important factor.

1. Reduce friction. With the increase of friction coefficient, the width increases, and the decrease of friction in cold rolling is mainly realized by adjusting the lubrication performance of emulsion. The temperature and concentration of emulsion should be increased to improve the lubrication performance of emulsion.

2. Small diameter roll is adopted for rolling. With the increase of roll diameter D, the length of deformation zone will increase, and the trend of metal with plastic deformation moving to the width direction will increase. By rolling with small roll diameter, the longitudinal movement resistance during metal deformation can be reduced, which is helpful to reduce the spread.

3. Adjust the tension. When the tension of the unit does not meet the adjustment amount required by the process, the spread problem will occur. According to the requirements of reversible cold rolling process, the tension setting decreases gradually with the increase of passes. Therefore, the tension difference between the front and back of the intermediate pass is optimized. In the principle of no coiling interlayer sliding during strip coiling, appropriately increasing the tension value of the intermediate pass can reduce the spread to a great extent.

4. Reduce rolling passes. In general, the larger the reduction, the larger the spread; Accordingly, the more rolling passes, the smaller the reduction and the smaller the spread. On the premise of a certain total reduction, the more rolling passes, the greater the overall spread. Therefore, the rolling schedule should be optimized and the rolling passes should be reduced.

Let's stop here about the factors affecting the cold rolling spread of Gaojian steel and the corresponding solutions. I hope this information can provide you with some help. In addition to providing Gaojian steel, our company also provides other kinds of steel with various types and reliable quality. We can recommend and provide suitable and practical steel plates according to the requirements of users.

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