|About this Abstract
||Materials Science & Technology 2012
||Steel Product Metallurgy and Applications
||Steel Cleanliness Control during Protective Gas Electroslag Remelting of H13 Die Steel
||Cheng-bin Shi, Xi–chun Chen, Fei Wang, Han–jie Guo
|On-Site Speaker (Planned)
H13 die steel is one of the most widely used hot working die steel grades. Oxygen and inclusions control during electroslag remelting of H13 die steel were experimentally studied. The inclusions in steel before and after P-ESR refining were analyzed by SEM-EDS. It was found that oxygen content can be reduced to the lowest (8 ppm) only when protective Ar gas combined with specially designed slag deoxidation treatment were employed simultaneously. All the inclusions in the electrode are MgO•Al2O3 spinels, besides some MgO•Al2O3 spinels surrounded by an outer nitride or sulfide layer. After P-ESR refining combined with proper Ca-treatment, MgO•Al2O3 spinels were modified to CaO–MgO–Al2O3 or CaO–Al2O3 inclusions. All sulfide inclusions in the electrode were removed during P-ESR process. The mechanisms of oxygen control, sulfide and oxide inclusions evolution during P-ESR process was proposed.
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