SWRCH45K冷镦钢生产过程中洁净度分析

In order to control the inclusions in SWRCH45 K cold heading steel and improve the internal quality of cold heading steel, this paper analyzes the cleanliness of process samples in the production process of SWRCH45 K cold heading steel, and explores the evolution law of inclusions in the production process of cold heading steel in a steel plant. The results show that the total oxygen content in the steel during continuous casting can be controlled at about 21 ppm under the production process of converter → LF refining → ladle → continuous casting, but the oxygen and nitrogen increase in the LF process are serious, and the LF refining process needs to be improved reasonably. The change process of inclusion composition is that the proportion of CaO in inclusions in steel increases gradually in LF process, and there are inclusions with MgO as the core after ladle hanging. In the continuous casting process, the inclusions are mainly aggregated Al2O3, MgO-Al2O3 and sulfide. In the production process of cold heading steel, attention should be paid to prevent secondary oxidation of molten steel and reaction with furnace lining.