Abstract
In the steel making process, the end point steel water residual manganese is a key indicator to measure the quality. This article introduced the latest information on the end point steel water residual manganese of the converters. Firstly, it has discussed the importance of steel water residual manganese. Secondly, this paper has outlined the steel water residual manganese control methods in various smelters at present. Lastly, process parameters were discussed to suggest techniques to reduce end point steel water residual manganese in the converter steelmaking process.
Steel water residual manganese is an important indicator that reflects the quality of molten steel. It is one of the most effective ways to reduce the oxygen content in molten steel, which can reduce the surface oxides of the steel. In addition, the management of steel water residual manganese is related to the overall process performance, and can effectively control the steelmaking temperature, cost, energy consumption and product quality.
At present, there are several ways to reduce end point steel water residual manganese in different smelting processes. In the open hearth steelmaking process, adjusting the cooling rate and the Si/Mn ratio can reduce the end point steel water residual manganese. In the electric arc furnace process, the end point steel water residual manganese can be controlled by adding manganese alloy, fine powder, and superheated water refinement. In addition, if the furnace temperature is too high, the end point steel water residual manganese can be reduced by inverting the furnace temperature.
In the converter steelmaking process, factors such as steelmaking furnaces, process parameters, feed material, refractory material and operation technology can affect the end point steel water residual manganese. In the optimum operation of converter steelmaking process, oxygen blown time should not be too long and the screw rate should be appropriate. In addition, to avoid the secondary oxidation of molten steel, the metal content of metal shredded powder and metal oxide should not be too low. Furthermore, the oxygen content of the slag should be less than 50%, and the MgO content should be above 5%. Finally, the scrap preheating temperature should be above 800°C.
In conclusion, to reduce the end point steel water residual manganese in the converter steelmaking process, it is important to consider the factors related to the properties of steelmaking furnaces, process parameters and material feed. By manipulating the oxygen blowing time, screw rate, metal content, slag oxygen content and scrap preheating temperature, it is possible to reduce the end point steel water residual manganese level in converter steelmaking process.
