Evaluation of Super Clean Steels According to Chemical Composition

Equipment of ŽĎAS, a. s. electric steel plant enables to make commercial high-grade steels with guaranteed high internal purity. Making of super clean steels means essential enhancement in qualitative requirements that requests new technological elements as well as operative management of steel making and treatment process. In order to verify the possibility to make these steels under ŽĎAS, a.s. conditions, three test melts of grades Realization of products in power engineering represents the verification and optimization of steel making technology of 2,8NiCrMoV and 3,5NiCrMoV types intended for forgings of the gas turbine shaft and compressor disk. The minimum content of tramp and trace elements is requested, especially phosphorus, sulphur, copper, antimony, arsenic and tin. Silicon, manganese and aluminium are considered as undesirable elements.