Method for monitoring a steelmaking process and associated computer program

A method of a steelmaking process in a steelmaking vessel, wherein matters Mn, each having respective properties PMn, are charged into the steelmaking vessel so as to produce a liquid steel and a slag, the method comprising the steps of:

• a. defining at least one set of target characteristics TCSY of the liquid steel to be produced;
• b. defining at least two slag targets STX, each of the slag targets STX comprising values representative of slag properties of the slag,
• c. calculating, for each slag target STX, a matter amount AMYX to be charged into the steelmaking vessel allowing to reach the at least one defined set of target characteristics TCSY, taking into account respective properties of each matter PMn, the matter amount AMYX comprising the individual amount aYXMn of each matter Mn to be charged, and
• d. selecting the matter amount AMYX.