Low-carbon and low-silicon steel deoxidation process

The invention relates to a low-carbon and low-silicon steel deoxidation process, comprising the following process flow: converter taping: tapping when the content of oxygen at the end point of the converter is over 500ppm; adding carbon powder at the beginning of the tapping for rough deoxidation, measured by the carbon dust of 0.15-0.25kgper ton of steel; adding aluminum iron for deoxidation alloying when the tapping is carried out to be 1/2 or 2/3, measured by the aluminum iron of 1.5-2.5kg/t steel; opening a steel ladle to an argon flushing station; supplementing aluminum iron: measuring the oxygen content of the steel ladle by using an oxygen probe, supplementing aluminum iron according to the measured oxygen content and adjusting the content of the oxygen of the steel ladle to be less than 50ppm; and flushing argon at the beginning of tapping at the flow of 300-400NL/min and adjusting the flow of bottom blowing argon gas to be 50-80NL/min when the steel ladle is opened to the argon flushing station for softly blowing argon. By using the carbon powder to deoxidize instead of the aluminum iron, the invention not only saves the cost of alloy, but also improves the purity of molten steel.