Method for monitoring a steelmaking process and associated computer program

A method of charging matters into 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. inputting, into a computer program, at least one set of target characteristics TCSY of the liquid steel to be produced, the at least one set of target characteristics TCSy includes at least one of a liquid steel temperature at an end of the steelmaking process, a liquid steel composition at the end of the steelmaking process and a liquid steel weight at the end of the steelmaking process;
• b. inputting, into the computer program, at least two slag targets STX, each of the at least two slag targets STX comprising values representative of properties of the slag,
• c. calculating, by the computer program, for each slag target of the at least two slag targets 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, at least some of the matters respective properties PMn being chosen among a scrap type, a scrap density a matter composition, a matter temperature, a matter maximum weight and a matter minimum weight, the matter amount AMYX comprising an individual amount aYXMn of each of the matters Mn to be charged, and
• d. selecting one of the matter amounts AMYX calculated in step c, together with its associated TCSY and slag target STX
• e. charging the steelmaking vessel with the matter amount AMYX
• wherein x is a number of slag targets (STX), and y is a number of sets of target characteristics (TCSy).