use of silicon calcium
Due to the calcium and the molten steeloxygensulfurhydrogen,nitrogenandcarbonIt has a strong affinity, so the silicon-calcium alloy is mainly used for molten steeldeoxidation, degassing and fixation of sulfur. When calcium silicate is added to molten steel, it produces a strong exothermic effect. Calcium becomes calcium vapor in the molten steel, which has a stirring effect on the molten steelNon-metallic inclusionsUpward is advantageous. After the deoxidation of the silicon-calcium alloy, the non-metallic inclusions with large particles and easy to float are generated, and the shape and properties of the non-metallic inclusions are also changed. Therefore, silicon-calcium alloy is used to produce clean steel, high-quality steel with low oxygen and sulfur content, and extremely low oxygen and sulfur contentSpecial performance steel. The addition of a calcium silicate alloy can eliminate the use of aluminum for finishingOxygen absorberProblems such as the nodulation of the steel in the ladle nozzle, and the blockage of the nozzle of the intermediate tank of continuous steel casting and ironmaking. In the furnace refining technology of steel, calcium silica powder or core wire is used for deoxidation and desulfurization, so that the content of oxygen and sulfur in the steel is reduced to a very low level; It can also be controlled in steelsulfidemorphology, while improving the utilization of calcium. In the production of cast iron, in addition to deoxidation and purification, silicon-calcium alloys also play a role in gestation, helping to form fine-grained or spherical graphite; envoyGrey cast ironMedium graphite is evenly distributed, which reduces the tendency of white mouth; And it can increase silicon,desulfurizationto improve the quality of cast iron.
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Soyee Cheng
ZHEN AN INTERNATIONAL CO.,LTD
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