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针对本钢薄板坯铸机在生产无取向电工硅钢的过程中存在的铸坯拉断、中包增碳、增氮等问题,进行了连铸工艺优化。通过采用新型无碳中间包覆盖剂、环保中间包干式料及专用结晶器保护渣后,降低了铸坯增碳量;通过控制钢包到中间包的增氮环节,降低钢水增氮;适当增大二冷水量,控制钢水过热度,防止铸坯拉断等生产事故的发生。改进工艺后,精炼后到成品铸坯的平均增碳量能控制在10×10-6以内,平均增氮量能控制在4×10-6以内。
Aiming at the problems of slab billet breakage, carbon inclusions increasing and nitrogen increasing in the process of producing non-oriented electrical silicon steel in Bengang thin slab caster, the continuous casting process was optimized. Through the use of new carbon-free tundish covering agent, green tundish dry material and special mold powder, reduce the carbon content of the slab; by controlling the ladle to tundish to increase nitrogen, reducing nitrogen in steel; appropriate increase two Cold water, control the degree of superheat molten steel to prevent slab off and other production accidents. After improving the process, the average amount of carbon added to the finished slab after refining can be controlled within 10 × 10-6, and the average amount of nitrogen added can be controlled within 4 × 10-6.