In the process of processing, we will find that the 304 stainless steel pipe will have surface defects such as edge cracks, scars, inclusions, and scars. The reason for these defects is roughly due to the transverse cracks in the subcutaneous corner of the outer arc of the cast slab, and the mold There are fine impurities mixed in, the oxide slag on the surface of the clean stainless steel tube is not cleaned up during the finishing, and it is formed by the edge of the casting billet turning over to the surface of the stainless steel tube during the rolling process. These defects not only reduce the surface quality of stainless steel pipes, but also have an impact on the improvement of product quality. Therefore, it is more important to prevent and deal with the surface defects of 304 stainless steel pipes in time.

There are deep scratches on the surface of the cast slab because the rollers of the sector section do not roll. In order to prevent this situation, the sector section must be protected in time, and it is strictly forbidden to perform equipment over-age. If there are fine impurities in the crystallizer, it will cause the water quality to change, so the water samples in the crystallizer should be checked on time. It is the best way to reduce the width of the edge cracks of the weakened stainless steel plate and the uneven deformation of the rolling edge of the wide steel plate. It is the best way to reduce the expansion of the steel plate when rolling the steel plate, that is to say, try to use the wide-end cast billet to produce a large width. Steel plate.

To prevent the corner temperature of the cast slab from entering the brittle zone during the tortuous process, it is necessary to dynamically control the corner temperature of the cast slab with different widths, and implement the water distribution zone control of the zigzag section. To reduce the non-uniform deformation condition of the rolled piece, it is necessary to reduce the difference in deformation resistance between the upper and lower surfaces of the rolled piece, optimize the heating process of the slab, and reduce the temperature difference between the upper and lower surfaces of the cast slab. To prevent secondary defects such as partial deep burn marks and unclean surface oxide slag after finishing the slab, it can be completed by improving the finishing of the 304 stainless steel tube casting slab.