Abstract: The ingredient of main inclusions in 38CrMoAl steel by 120 t BOF-LF-RH-CC process is A1₂O₃ and CaS. The CaS content decreases and the A1₂O₃ content increases with the time of refining. By calcium treatment experiments, it is obtained that the inclusions of 38CrMoAl steel could not be modified by calcium treatment, on the contrary, more CaS inclusions could be obtained by calcium treatment, leading to nozzle clogging during continuous casting of 38CrMoAl steel. The results of industrial experiments show that a good casting is obtained when the sulfur content after LF refining is controlled at 0.001% ~0.002% and no calcium is added after RH degassing.

摘要： 38CrMoAl钢120t BOF-LF-RH-CC冶炼过程钢中夹杂物主要以CaS和A1₂O₃为主，并且随着精炼的进行，夹杂物中CaS含量逐渐升高,AI₂O₃含量逐渐降低。通过钙处理试验,得出采用钙处理工艺，不仅不能有效变性 38CrMoAl钢中夹杂物，反而会产生更多CaS夹杂物，最终引发由CaS产生的水口结瘤。工业试验结果表明，在RH原工艺基础上取消钙处理工艺，将LF精炼结束钢水硫含量降低至0.001% -0.002%,可以很好的改善钢水浇铸性

关键词: 38CrMoAl钢, 钙处理, CaS, 水口结瘤