关键词: 冷镦钢ML08Al, 非金属夹杂物, RH, LF, 洁净度

Abstract: The types and quantity density of non-metallic inclusions, and the change of total oxygen in steel ML08Al produced by the two processes BOF-RH-CC and BOF-LF-CC are analyzed. The results show that the main non-metallic inclusions in steel after BOF deoxidizing alloying of two process are Al₂O₃, in the process of "BOF-LF-CC" , the partial non- metallic inclusions in steel at the end of LF refining are changed from Al₂O₃ to Al₂O₃ ・ CaO and Al₂O₃ • MgO, but in the process of "BOF-RH-CC" , after RH vacuum the non-metallic inclusions Al₂O₃ are still dominated. After deoxidizing alloying, the total oxygen content in BOF molten steel is 27. 8 x 10^-6 ~31. 5 x 10^-6 , the total oxygen content in steel at LF end is 20. 2 x 10^-6 ~22. 5 x 10^-6 , but the total oxygen content in steel at RH end is 14. 7 X 10^-6~ 15. 3 x 10 ^-6. The removal rates of inclusions by LF refining and RH vacuum treatment are 49. 6% and 80. 9% respectively. Therefore, the cleanness of the cold heading steel ML08Al produced by the process of "BOF-RH-CC" is better than that produced by the process of “BOF-LF-CC”.