In the steelmaking process, particularly during the ladle furnace stage, the ability to control sulfur content in molten steel to 30 ppm is critical for specific steel grades. This study aims to achieve reliable sulfur control by regulating the slag composition through flux addition during the steelmaking process, and by conducting preliminary desulfurization via the bubbling and powder injection (BAP) process. The target steel had a composition of [C] 0.08-0.16, [Mn] 1.0-1.5, [P] ≤ 0.02, and [S] ≤ 0.003 wt%. During the converter tapping process, flux was added in amounts of 1,000 kg, 1,500 kg, and 2,000 kg. In the BAP process, top and bottom bubbling was applied for 3 min, 5 min, and 8 min, respectively, to evaluate the effectiveness of preliminary desulfurization. The results confirmed that increasing the amount of flux improved sulfur control performance in the ladle furnace process. Moreover, when the BAP bubbling time exceeded 5 min, the time required to control sulfur in the ladle furnace process was significantly reduced. This study demonstrates that, in order to effectively control sulfur during the ladle furnace stage, both appropriate flux addition and preliminary desulfurization through the BAP process are essential.

Abstract
1. 서 론
2. 실험 방법
    2.1. 초기 강종 및 결함 분석
    2.2. 실험용 강종 및 용선 예비처리
    2.3. 전로 조업 및 조재제 투입
    2.4. Bubbling and Powder Injection (BAP) 공정
    2.5. 시료 채취 및 분석
    2.6. Ladle Furnace (LF) 공정
3. 결 과
4. 고 찰
5. 결 론
Acknowledgement
References
<저자소개>

• 이재관(국립순천대학교 신소재공학과) | Jae-Gwan Lee (Department of Materials Science and Metallurgical Engineering, Sunchon National University, Suncheon 57922, Republic of Korea)
• 이동근(국립순천대학교 신소재공학과) | Dong-Geun Lee (Department of Materials Science and Metallurgical Engineering, Sunchon National University, Suncheon 57922, Republic of Korea) Corresponding author
• 유철종(국립순천대학교 신소재공학과, 포스코 광양제철소 제강부) | Chel-Jong Yoo (Department of Materials Science and Metallurgical Engineering, Sunchon National University, Suncheon 57922, Republic of Korea, Steel Making Department, POSCO, Gwangyang 57765, Republic of Korea)
• 김광수(한국폴리텍대학교 산업안전검사과) | Gwang-Su Kim (Industrial Safety Inspection Department, Korea Polytechnics, Suncheon 57975, Republic of Korea)