How To Control The Inclusion Content in Square Tubes

Alumina type:
Shape: Most have no deformation, are angular, and are smaller in shape than black or bluish particles.
Distribution: There are at least three particles in a row along the rolling direction.
Globular oxides:
Shape: Undeformed, angular or rounded particles, smaller black or bluish in shape, irregularly distributed.
Single particle spherical type:
Shape: round or nearly round, single-particle inclusions with a diameter of ≥13 μm.

Sulfide type:
Form: A single gray inclusion with high ductility and a wide range of aspect ratios.
Distribution: In square and rectangular tube materials, the ends are generally rounded.
Silicates:
Form: Highly ductile, with a wide range of form ratios as individual black or dark gray inclusions.
Distribution: Generally the ends are at sharp angles.
Regarding the evaluation of traditional types of inclusions, it is possible to compare their shapes with the above five types of inclusions and note their chemical characteristics. For the evaluation of lake phase inclusions such as borides, carbides, carbonitrides or nitrides, their morphology can also be compared with the above five types of inclusions, and their chemical characteristics can be expressed in the same way.
The determination of these characteristics is of great significance for controlling or reducing the inclusion content in square and rectangular tubes and improving quality.