The transport inspection was conducted with a set of bearings (figure 1.3-1) and rolls (figure 1.3-2), which were severely stripped.

Non-metal-filled impurities are those which are present in steel or non-metal compounds. Non-metal-containing impurities are generally found in steel materials, which vary in variety and shape, and affect steel in a different way.

The classification of non-metal matter in steel contains a generic description of the particles of non-metal matter in steel. The steel contains elements such as oxygen, nitrogen, sulphur, which are soluble in steel at high temperatures, and very low solubility at room temperature, and are diagnosed and combined with, for example, iron and other metals, as non-metal binders.