The absorption rate of alloy elements and influencing factors in the steel smelting process
Steel smelting is a very important effect on the quality of steel, so that the steel alloy elements all metallurgical index and chemical composition, especially the uniformity of alloy element absorption process on the surface of steel steel smelting and the quality of products due to the decline or decline, reducing the production efficiency. Therefore, the comprehensive research on the absorption rate of various alloy elements and its influencing factors in steel smelting process has become an important task for steel production.
Generally speaking, the content of alloy elements in steel is divided into two forms: high content and low content. The total content of alloy elements should not exceed the limit specified by the national standard, otherwise it will cause problems such as segregation during steel smelting and burning. Therefore, the basis for achieving a certain total content of alloy elements is to control the absorption rate of alloy elements in steel smelting process. Specifically, the alloy elements with medium and high content can be discussed separately.
For the alloy elements with medium content, the adjustment of their content is of great significance for controlling the difference in distribution of alloy elements, the segregation of alloy elements and the shape of steel ingots in the steel smelting processes such as secondary refining, alloy adding and irrigation. The factors influencing the absorption rate of alloy elements with medium content include the selection of steelmaking technology, the addition time and method of alloy elements, the composition of the ladle slag at the time of alloy addition and the temperature at the time of alloy addition.
First of all, the selection of steelmaking technology can directly affect the absorption rate of alloy elements with medium content. Because the absorption rate of alloy elements has a certain relationship with the steelmaking process adopted by the group. For example, if the smelting of steel is carried out by electro-slag remelting, the absorption rate of alloy elements is obviously higher than that of argon-oxygen decarburization.
In addition to selecting steelmaking process, the timing and method of alloy elements are also important. Generally speaking, if alloy elements are added at the end of routine steelmaking, the absorption rate is higher than that of adding them at the beginning, especially when alloy elements with medium content are added in the form of iron powder. The reason is that iron powder can more fully react with the molten steel, so the absorption rate is higher.
Whats more, the composition of the ladle slag at the time of alloy addition is an important factor affecting the absorption rate of alloy elements with medium content. Generally speaking, the absorption rate of alloy element is inversely proportional to the content of basic slag. Obviously, when the slag is basic, this will reduce the affinity between molten steel and alloy elements, resulting in poor absorption of alloy elements.
Finally, the temperature at the time of alloy addition also has an important impact on the absorption rate of alloy elements. Generally speaking, the higher the temperature, the higher the absorption rate, but the temperature should not exceed the specified temperature range, otherwise too high temperature will cause different problems in steelmaking process.
The alloy elements of high content are mainly sulfur, phosphorus and other elements, and their absorption rate is mainly determined by the addition process of alloy elements and the temperature of the ladle at the time of addition. Generally speaking, if sulfur and phosphorus are added in liquid form, their absorption rate is lower than that of adding them in solid form.
In addition, this temperature of the ladle should not be too low. When the temperature is below zero, the solubility of sulfur in molten steel will decrease, resulting in lower absorption rate of sulfur. On the contrary, when the temperature is too high, the effect of sulfur absorption can be improved, but this will also increase the probability of burning of sulfur during the steelmaking process.
In summary, the absorption rate of alloy elements in steel smelting process is determined by various factors, such as the selection of steelmaking technology, the addition time and method of alloy elements, the composition of the ladle slag at the time of alloy addition and the temperature at the time of alloy addition. Therefore, it is necessary to control the absorption rate of various alloy elements in steel smelting process according to the actual situation of the enterprise and adopt corresponding measures to ensure the quality of steel smelting.
