{"id":20442,"date":"2021-03-09T06:35:47","date_gmt":"2021-03-09T06:35:47","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=20442"},"modified":"2021-03-09T06:36:32","modified_gmt":"2021-03-09T06:36:32","slug":"non-metallic-inclusions-in-steel-and-methods-to-identify-them","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/fr\/non-metallic-inclusions-in-steel-and-methods-to-identify-them\/","title":{"rendered":"Inclusions non m\u00e9talliques dans l'acier et m\u00e9thodes pour les identifier"},"content":{"rendered":"
Non metallic inclusions mainly come from various types of non-metallic inclusion compounds formed by the corresponding increase of the equilibrium constants of oxygen, sulfur and nitrogen compounds in the process of liquid steel condensation. The products formed by chemical reaction should be called non-metallic inclusion or inclusion for short. Although the amount of inclusions in steel is small, it has a bad effect on the quality of steel materials and products. With the development of modern material engineering technology, the requirement of steel quality is increasingly strict. Therefore, in-depth study of non-metallic inclusions will be of great significance to material identification, product fracture analysis, scrap analysis and failure analysis.<\/p>\n\n\n\n
Inclusions are mainly caused by a series of physical and chemical reactions during melting and solidification of steel. According to their sources, they can be divided into endogenous (internal) inclusions and exogenous (external) inclusions.<\/p>\n\n\n\n
endogenous inclusions<\/p>\n\n\n\n
Endogenetic inclusions refer to the products produced by the chemical reaction between various material components in the process of steel smelting, casting and condensation, or the contact between the steel and the atmosphere or container in the furnace, or the particles precipitated due to the decrease of solubility when the condensation temperature of liquid steel decreases.<\/p>\n\n\n\n
foreign inclusions<\/p>\n\n\n\n
Foreign inclusion is also called external inclusion or accidental inclusion. It is due to the smelting, casting production process, from the equipment or container off and mixed into the liquid steel impurities. In addition, sometimes due to the negligence of smelting operation, the refractory brick cracks and falls off due to thermal impact, forming products with other kinds of oxides and becoming foreign inclusion<\/p>\n\n\n\n