Abstract: According to the requirement of production for high strength pipe line steels at Masteel and combined with the forming region of 12CaO , 7 Al₂O₃ of CaO-Al₂O₃-SiO₂ phase diagram, the ladle refining slag series ( % ： 55 - 60CaO, 7 〜12SiO₂, 25 ~ 30Al₂O₃,4 〜8MgO) for pipe line tube has been developed and applied. 300 t LF refining practice shows that with using the refining slag series, the average desulphurization rate is 73. 2% , the end sulphur content in steel is controlled less than 0. 002% ； and the slag series has nice capability to absorb inclusions, the Alt - Als content in steel is lower, i.e, 0. 002% -0.013%.

Key words: Pipe Line Steel, Refining Slag, Desulphurization Rate, Inclusions

摘要： 根据马钢生产高强度管线钢的需求,结合CaO-Al₂O₃-SiO₂相图12CaO·7Al₂O₃生成区域,开发了管线钢用钢包精炼渣系(%:55～60CaO、7～12SiO₂、25～30Al₂O₃、4～8MgO)。300 t LF精炼实践表明,该精炼渣的平均脱硫率为73.2%,钢中终点硫含量可控制在0.002%以下;而且该渣系具有较好的吸收夹杂物的能力,精炼后钢中Alt-Als含量较低,为0.002%～0.013%。

关键词: 管线钢, 精炼渣, 脱硫率, 夹杂物