Although the content of non-metallic inclusions in the rectangular tube is small, it has a great impact on the performance of the pipe, so the detection of non-metallic inclusions has become one of the important items in the production process. A correct understanding of the source, composition, form, hazard principle, distribution and microscopic characteristics of inclusions is of great significance for controlling or reducing the content of inclusions in the rectangular tube and improving the quality.

And to determine the category of non-metallic inclusions in the rectangular tube can refer to the following characteristics:

(1) Alumina: most of them have no deformation, have horns, and are smaller in shape than black or bluish particles. They are arranged in a row along the rolling direction, and there are at least three particles.

(2) Spherical oxides: non-deformable, angular or rounded, black or bluish, irregularly distributed particles.

(3) Single-particle spherical type: round or approximately round single-particle inclusions with a diameter of ≥13μm.

(4) Sulfides: A single gray inclusion with high ductility and a wide range of aspect ratios. Generally, the ends of the rectangular tube are rounded.

(5) Silicates: have high ductility, a single black or dark gray inclusion with a wide range of aspect ratios, and generally have an acute angle at the end.

The evaluation of traditional types of inclusions can also be done by comparing their shape with the above five types of inclusions and indicating their chemical characteristics. The evaluation of the precipitates in the rectangular tube, such as borides, carbides, carbonitrides or nitrides, can also be compared with the above five types of inclusions based on their morphology, and their chemical characteristics can be expressed according to the above-mentioned method.

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