Method for flame-cutting metal workpieces containing iron, wherein each workpiece is subjected to a heating flame and a cutting jet applied by means of a nozzle connected to a blowtorch, said blowtorch being fed by a pressurized fuel gas supply line and a pressurized oxygen supply line and being controlled by means for moving the blowtorch relative to each workpiece to be flame-cut, characterized by the following steps: - implementing means for determining optimum parameters in terms of the pressure and flow rate of the fuel gas and of the oxygen and in terms of the position and speed of movement of the blowtorch relative to the workpiece to be flame-cut, based on the nature of the metal of which the workpiece is made, and a thickness of the workpiece, and different phases of the flame-cutting method, and the type of nozzle employed, and a given temperature of the workpiece to be reached, - executing at least one program for controlling the pressurized fuel gas supply line and the pressurized oxygen supply line and means for moving the blowtorch, said program providing control setpoints based on implementing the predetermined optimum parameters, - storing, in memory means, means for automatically running at least one program for controlling the pressurized fuel gas line and the pressurized oxygen supply line and the means for moving the blowtorch, - implementing means for automatically selecting at least one control program, and implementing means for automatically sending corresponding control setpoints to the pressurized fuel gas supply line, the pressurized oxygen supply line and the means for moving the blowtorch; - recording the pressure of the fuel gas and pressurized oxygen in the immediate vicinity of the blowtorch and the flow rate of the fuel gas and of the pressurized oxygen and the temperature of the workpiece and the position and speed of the blowtorch relative to the workpiece in real time; - supplying the recorded data to the automatic-running means to verify whether the read data and the control setpoints of the selected control program correspond, and; - if necessary, when the measured data deviate from a defined interval around the control setpoints, regulating the pressure and/or the flow rate of the fuel gas supply line and/or of the pressurized oxygen supply line, and/or the position and/or the speed of movement of the blowtorch relative to the workpiece to be flame-cut, so as to bring the corresponding data within the defined interval. - implementing means for determining optimum parameters in terms of the pressure and flow rate of the fuel gas and of the oxygen and in terms of the position and speed of movement of the blowtorch relative to the workpiece to be flame-cut, based on the nature of the metal of which the workpiece is made, and a thickness of the workpiece, and different phases of the flame-cutting method, and the type of nozzle employed, and a given temperature of the workpiece to be reached, - executing at least one program for controlling the pressurized fuel gas supply line and the pressurized oxygen supply line and means for moving the blowtorch, said program providing control setpoints based on implementing the predetermined optimum parameters, - storing, in memory means, means for automatically running at least one program for controlling the pressurized fuel gas line and the pressurized oxygen supply line and the means for moving the blowtorch, - implementing means for automatically selecting at least one control program, and implementing means for automatically sending corresponding control setpoints to the pressurized fuel gas supply line, the pressurized oxygen supply line and the means for moving the blowtorch; - recording the pressure of the fuel gas and pressurized oxygen in the immediate vicinity of the blowtorch and the flow rate of the fuel gas and of the pressurized oxygen and the temperature of the workpiece and the position and speed of the blowtorch relative to the workpiece in real time; - supplying the recorded data to the automatic-running means to verify whether the read data and the control setpoints of the selected control program correspond, and; - if necessary, when the measured data deviate from a defined interval around the control setpoints, regulating the pressure and/or the flow rate of the fuel gas supply line and/or of the pressurized oxygen supply line, and/or the position and/or the speed of movement of the blowtorch relative to the workpiece to be flame-cut, so as to bring the corresponding data within the defined interval.