Introduction and uses of silicon-aluminum ferroalloy

Introduction to silicon-aluminum ferroalloy

An intermediate alloy composed of iron and one or several elements, mainly used in steel smelting. In the steel industry, all intermediate alloys used in steelmaking, whether containing iron or not (such as silicon-calcium alloys), are generally called "ferroalloys". It is also customary to include some pure metal additives and oxide additives.

Silicon-aluminum ferroalloy is a mixture and has no chemical formula. The proportions of various metals in different alloys are different, and different alloys formed by metals with the same chemical formula cannot be used. Alloy is a physical phenomenon, so it is impossible to have a corresponding chemical equation. Ferroalloys, in a broad sense, refer to ferroalloys that are added to molten iron as deoxidizers, elemental additives, etc. during steelmaking.

Silicon-aluminum ferroalloy is a deoxidizer used in steelmaking production. It improves the shape of inclusions and reduces the content of gas elements in molten steel. It is an effective new technology to improve steel quality, reduce costs, and save aluminum. It is especially suitable for the deoxidation requirements of continuous casting molten steel. Practice has proved that it not only meets the deoxidation requirements of steelmaking, but also has desulfurization performance and has the advantages of large specific gravity and strong penetrating power.

Applications of silicon aluminum ferroalloy

Silicon-aluminum ferroalloy is a strong deoxidizer and a reducing agent for making other metals and alloys. It is also used in thermite welding, manufacturing of exothermic agents and explosives, etc. There are no national standards or ministry standards for the technical conditions of ferrosilicon. The average particle size is 30~100mm. Less than 15% of the particles in each batch are allowed to leave the factory. There should be no obvious bubbles and non-metallic inclusions on the surface.

Silicon-aluminum ferroalloy can improve the quality of steel by reducing the gas content in molten steel, thus reducing the company's production costs. It is a good new technology for saving aluminum. It is especially suitable for the deoxidation requirements of continuous casting molten steel. Practice has proved that it not only meets the deoxidation requirements of steelmaking, but also has desulfurization performance and has the advantages of large specific gravity and strong penetrating power.

Silicon-aluminum ferroalloy and gap ferrite are two commonly used materials. In terms of soft saturation, gap ferrite must be designed in the safe zone of the descending curve. Ferrosilicon is designed to operate within a controlled droop range, which provides good fault tolerance, especially at high powers.

Silicon-aluminum ferroalloy is a composite strong deoxidizer. The density of silicon-aluminum ferroalloy is much greater than that of pure aluminum. It easily enters the molten steel and has less internal burning loss. In the steelmaking process, the deoxidizing effect of silicon-aluminum ferro-alloy is that of pure aluminum. The deoxidation effect is more than doubled. Deoxidation of silicon-aluminum-iron forms low melting point products, which easily float on the surface of molten steel, reducing inclusions in molten steel and improving the quality of molten steel.

Silicon-aluminum ferroalloy does have many advantages in steelmaking, which has impressed many steel-making manufacturers. Because it is cheap and can improve the quality of steel, more and more steel plants are beginning to use ferrosilicon for steelmaking.