| Abstract: | Experiments were carried out with a view to ascertaining the most suitabledeoxidation process for basic open-hearth smelting of rail-steel in Anshan works.Itwas found that the amount of oxides inclusions in finished rails was definitely lessif preliminary deoxidation was carried out before tapping,the best results being ob-tained when manganese-silicon alloy alone was used as deoxidizer.Similar rails madefrom heats without preliminary deoxidation were found to contain almost twice theamount of oxides inclusions.The sulphur content of the above rail-steel usually amounted to 0.03-0.04%,theamount of sulphides inclusions is at least equal to,or sometimes double,the amountof oxides inclusions.In such cases sulphides rather than oxides inclusions play thedetermining role for the mechanical properties of the finished rails.As a matter offact,no appreciable difference was observed for rails made by different deoxidationprocesses.Data concerning the size and shape of oxides inclusions in rails made by differentdeoxidation processes have been discussed,and it is pointed out that only in certainspecial cases could the oxygen content of liquid steel prior to tapping provide aqualitative estimation of the amount of oxides inclusions in finished steel products. |
