According to the statistics of nonferrous metal processing industry association, the comprehensive output of copper processing materials in China in 2019 is 18.16 million tons, of which the output of red copper strip is 670000 tons, accounting for 35.8% of the total output of copper strip. Semi continuous casting machine is a kind of production equipment which uses semi continuous casting process to produce non-ferrous metal parts. The oxidation of furnace head will affect the oxygen content in molten copper. Therefore, it is necessary to improve the production device to reduce the oxygen content and eliminate the internal defects of copper strip.

Red copper strip is a kind of non-ferrous metal processing parts with good conductivity, heat conduction, ductility, corrosion resistance, weatherability and processing performance, with extremely low oxygen content. It has a wide application value in the electrical industry, processing and manufacturing industry and other fields. A nitrogen protection device was designed and installed in the furnace head of 650 semi continuous casting machine, which can effectively overcome the problem of casting tube oxidation and reduce the oxygen content of slab, and has good application value.