For the electric furnace steelmaking, ingredients is related to whether the melting can smoothly operate andcost of the production. The reasonable ingredients can shorten melting time. Firstly it should carefully calculate correctly and accurate weighing the charge, next the size of the furnace charge should be fit proportionally. Thirdly various ingredients should meet the requirement of the process.
The content of major elements at furnace burden is required as following
Carbon content
Carbon distribution is determined according to the three factors of carbon loss in melting period, decarbonization in oxidation period and carbon increase in reduction period. When the charge is melted, the carbon content in steel is 0.3%~0.4% higher than the lower limit of finished product specification, but the carbon distribution can not be too high, otherwise it will prolong the oxidation time and overheat the molten steel.
Silicon content
The silicon content is generally not more than 0.8% of the charge, or will delay the boiling of molten steel.
Manganese content.
The Manganese can not be considered to general steel grade , usually the manganese content is less than 0.3 after melting, otherwise it will delay the boiling of liquid.
It is better that the content of phosphorus and sulfur is lower The phosphorus content should be less than 0.05% after melting.
