利用光学碱度计算了1873 K时CaOSiO2Al2O3MgO(10%)四元精炼渣系的硫容量，从理论上分析了精炼高级别管线钢超低硫控制的工艺条件，绘制出精炼渣硫容量、渣中硫、钢中溶解氧与钢中硫的关系图。分析了某钢厂LFVD高级别管线钢生产工艺，LF1（LF炉精炼初期）、LF2（LF炉精炼末期）和VD精炼渣的氧化能力w（（MnO+FeO））分别为11.92%、2.00%和1.1０%，精炼渣碱度分别为3.195、6.250和7.600，精炼渣的曼内斯曼指数M（R/w(Al2O3）)分别为0.09、0.17和0.18，精炼渣硫容量CS′分别为0.010、0.022和0.023。钢中硫的质量分数从LF1的80×10-6，降低到LF2的（20～30）×10-6 ，并稳定在VD末期的20×10-6以下，与理论计算相符。
The variation of sulfide capacity with composition in the slag system CaOSiO2Al2O3MgO(10%) at 1873 K was calculated by using the optical basicity. The high grade pipeline steel refining process arts to control superlow sulphide are analysised and the relationship figure of sulphide capacity, (%S), ［%O］ and ［%S］ is drawn. A LFVD refining process was analysised. During the process of LF1(the primary state of LF process), LF2(the end of LF process) and VD, the (MnO+FeO）content of topslag are 11.92%, 2.00% and 1.1%; the basicity(R) of topslag are 3.195, 6.25 and 7.6; The M number (R/Al2O3) of topslag are 0.09, 0.17 and 0.18; the sulfide capacity(CS′) of topslag are 0.01, 0.022 and 0.023. And the ［%S］ of steel are 80×10-6 during LF1, (2030)×10-6 during LF2, and below 20×10-6 during VD, which is consistented with the calculating result.
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