Optimum production regimes are established for steel extra-furnace treatment providing not only low contamination with non-metallic inclusions (NI), but also formation of NI with favorable morphology not having a deleterious effect on steel corrosion resistance. It is shown that this is achieved by controlled input of Al in steel alloying and deoxidation stages, limiting its content in steel, limiting the temperature for additionof aluminum and calcium in the final treatment stage, and also the duration of the flushing period. For steel micro- alloyed with titanium it is also possible to form another type of NI that does not adversely affect steel corrosion resistance. The oxide component of these NI with a high content of calcium and titanium acquires a rounded shape. Formation of such NI is achieved by the controlled addition of Al, Ti, and Ca in the concluding treatment stage.

中文翻译：

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建立低合金钢炉外加工的最佳生产制度，以通过形成有利的非金属夹杂物来确保其在水性介质中的良好耐腐蚀性

建立了最佳的钢制炉外处理生产方案，不仅可以提供低污染的非金属夹杂物（NI），而且还可以形成具有良好形貌且对钢的耐腐蚀性没有不利影响的NI。结果表明，这是通过在合金化和脱氧阶段控制铝的输入，限制其在钢中的含量，限制最终处理阶段添加铝和钙的温度以及冲洗时间的持续时间来实现的。对于与钛微合金化的钢，还可能形成另一种不会对钢的耐腐蚀性产生不利影响的NI。这些NI中的钙和钛含量高的氧化物成分呈圆形。此类NI的形成是通过受控添加Al，Ti，