Abstract: Subject of the invention is a process for the production of steels having low carbon content wherein oxygen is blowing under vacuum, the carbon end point and blow temperature are controlled, the tapping of the steels is followed by slag skimming, heating, refining under vacuum, then finishing and casting, where the oxygen is admitted into the melt through blow lance, the units of the system are water cooled and the generating flue gases are discharged from the system. According to the process of the invention the melt is flushed over with argon from underneath during the admission of the oxygen from the top through the blow lance; the composition, temperature and quantity of the emerging flue gases, as well as the temperature and quantity of the admitted and discharged cooling water are continuously measured, the argon intensity is controlled accordingly and the manipulations and technological steps are carried out according to the obtained measuring results.