Inoculants can promote graphitization, reduce white mouth tendency, improve graphite morphology and distribution, increase the number of eutectic clusters, and refine the matrix structure. A short time (about 5-8 minutes) after the inoculation works well. Mainly suitable for general ingredients or transient incubation in the later stage.
The inoculant is widely used and has the characteristics of eliminating white mouth and preventing spheroidization and decay; long pouring time, high efficiency, long effect, uniform cross-section structure and improved performance. Inoculants widely use ordinary gray cast iron and nodular cast iron. It is used in workshops of gray cast iron, nodular cast iron heavy parts, uneven wall thickness parts, long pouring time or long molten iron transportation distance.
Inoculants are very closely related to the decline in vaccination. The incubation time of silicon is very short, because it mainly incubates by stimulating the formation of autologous nuclei. After being kept at a high temperature for a long time, diffusion will weaken the concentration fluctuations and energy fluctuations of autogenous nuclei, resulting in a gradual decrease of autogenous nuclei. Barium is a good breeding element. The ionic barium dicarbonate it produces is relatively stable. In addition, its specific gravity is greater than calcium and its vapor pressure is also small. The decay time can be extended. This is a promising inoculant.
Metals such as aluminum, titanium, zirconium, and cerium have strong deoxidizing ability in addition to carbides as cores. They can further reduce molten iron, reduce the combination of oxygen and calcium, create favorable conditions for the combination of calcium and carbon, promote the formation of calcium dicarbonate nuclei, and protect the role of calcium dicarbonate for a long time.
Iron alloys are commonly used as: (1) deoxidizers. During the steelmaking process, oxygen in the molten steel can be removed, and impurities such as sulfur and nitrogen in some iron alloys can also be removed. (2) Alloy additives. In order to improve the performance of steel, alloy elements are added to the steel according to the composition requirements of the steel. (3) Inoculant. Adding molten iron before casting can improve the crystal structure of the casting. In addition, it is also used as a reducing agent for metal thermal reduction to produce other ferrous alloys and non-ferrous metals, as an alloy additive for non-ferrous alloys, and a small amount is used in chemical and other industries.
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