Adding a certain amount of sulfur to gray cast iron can improve cutting performance, inoculation effect and graphite morphology. Because sulfur can shorten graphite length, blunt the end and distort the morphology, adding sulfur can also improve the mechanical properties of gray cast iron, the sulfur content in gray cast iron is favorable in the range of 0.08% -0.12% . When the equivalent content is less than 0.05% , the sulfur-increasing treatment must be carried out. The special sulfur-increasing agent for cast Gray Iron produced by our company is easy to use, safe and reliable, with very few impurities and high absorptivity, up to 95% . In electric furnace production, after adding a small amount of iron in the electric furnace, according to the demand of sulfur, the appropriate size of the sulfur-increasing agent is added to the furnace, and then the iron is added to press the sulfur-increasing agent, and the smelting process is carried out, low sulfur content in molten iron (less than 0.008%) is also detrimental. The normal range is 0.010% -0.014% . Even if, for electric furnace smelting, in this range also need to adopt hydrogen inoculant sulfur, improve the activity of hot metal, I can provide a variety of sulfur additives to meet the majority of customers to choose.