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Jiangshan Huaxing Machinery Factory, to introduce the types and causes of steel inclusions.

Steel inclusions mainly refer to non-metallic inclusions in steel, it is generally believed that non-metallic inclusions in steel usually exist in the following forms: Oxides: oxides: oxides: oxides: oxides: oxides: oxides: oxides: oxides: oxides: oxides: oxides: oxides: oxides: oxides.

Non-metallic inclusions in steel come from two aspects: First, with the smelting process, that is, the secondary oxide products of steel liquid and air, and the deoxidation products and pouring process of ferroalloy when steel is produced, called endogenous inclusions. Such inclusions are usually small particles and uniformly distributed in steel. Second, for various reasons, it is brought in from the outside, called external inclusions. Such inclusions have many irregular shapes, large size and uneven distribution are the main reasons for cracks, and have great harm to steel.

Endogenous inclusions mainly occur in the following cases: (1) In the smelting process, the deoxidation product is not completely eliminated, or the temperature drops during the pouring process, the deoxidation product floats up in sufficient time, and remains in the steel liquid. Some of them exist in the matrix structure of steel, some of which constitute large particles of Al2O3), and some exist in the solid solution state of steel (such as non-oxidized steel); (2) During the steel and pouring process, the liquid of the steel contacts the air, and the oxygen combines with the intermediate elements of the steel to form a secondary oxide, which remains in the liquid of the steel; In the process of steel liquid solidification, due to the selective crystallization of steel liquid, such as low melting point FeS. FeO et al., and finally precipitate between grain boundaries and dendritic crystals.