关键词: 100t EBT-LF-VD-CC, 油缸, 硅钙脱氧, 夹杂物

Abstract: The measures as applying the process of Si-Ca deoxidation, controlling the total content of oxygen in the EAF molten steel and the content of Al₂O₃ in LF slag,Control refining time ≥40 min,vacuum degassing(VD),control soft blow time ≥20 min, and protecting cast to prevent secondary oxidation of the molten steel and promote the floating o£ inclusions in the steel are adopted at Hengsteel. The number and size of Grade B inclusion Al₂O₃ in the molten steel are reduced to improve the cleanliness of steel. Production practice shows that controlling steel [Al]s≤0.004% ,T[O] ≤0.0020% , refined final slag (FeO) ≤0.8% and alkalinity (R) between 2.0 and 3.2 in liquid of hydraulic cylinder steel are available to control Grade B inclusion. Grade B inclusions not exceeding class 1.0 is beneficial to control the production of " white spots" in the SRB process.