High carbon ferrochromium is an iron alloy containing chromium, which is obtained by smelting chromium ore, lime (limestone or jadeite), and crushed coke in an electric furnace. Due to the excellent performance of high carbon ferrochrome and its widespread popularity among consumers, silicon manganese alloy particle manufacturers use vacuum treatment for the treatment of high carbon ferrochrome. In this regard, high carbon ferrochrome manufacturers introduce:
High carbon ferrochromium contains 30% gas by volume (mainly nitrogen and hydrogen), which floats at the interface between molten steel and slag during steelmaking, increasing the burning loss of chromium and reducing the recovery rate; When chromium iron alloy containing bubbles is crushed and packaged, silicon manganese alloy will cause a large amount of metal loss. The vacuum treatment of high carbon ferrochromium is a casting process adopted to reduce the gas content of the alloy.
It involves placing a molten iron ladle filled with liquid chromium iron into a vacuum chamber, sealing it, and using a vacuum pump to extract air for about 5 to 7 minutes, with a vacuum degree of 10.6 kPa to 13.3 kPa. Then, breaking the vacuum, removing the ladle, and casting it again can achieve the goal of reducing inclusions and gases, making the surface of high carbon chromium iron smooth and flat, reducing fragmentation and packaging losses.