The invention relates to a method for removing total
oxygen in low-carbon
molten steel. The method of the invention solves the shortcomings that in the prior art, the content of dissolved
oxygen of
molten steel is increased, the inclusion is increased after
deoxygenation, and the total
oxygen content is higher and the like. The method has the following steps: tapping by a
slag dam method; adding
lime with 2.6-3.0kg of each
ton of steel into steel
ladle liquid level when tapping amount reaches 1 / 2-2 / 3; transmitting steel
ladle to an RH work
station after tapping, controlling the content of carbon in
molten steel to be 0.03-0.04% in weight ratio, the content of dissolved oxygen to be 0.055-0.07% in weight ratio, and the
slag thickness to be 50-70 mm; carrying out RH vacuum
processing: firstly carrying out vacuum decarbonizing, deoxidizing and alloying; adding blending agent composed of
lime and
fluorite to the molten steel, wherein, the adding amount is 3-5 kg of each
ton of steel; and driving molten steel circulation by
argon during the time. In the invention, the equipment does not need to change, the operation is flexible, the total
oxygen content in the molten steel and the sulphur content are obviously lowered after
processing, and the performance and quality of post-procedure products are improved.