Method for producing low-manganese molten steel by converter process

The invention discloses a method for producing low-manganese molten steel by a converter process. The method comprises the following steps: putting molten iron into an injection tank; blowing operation is carried out, the blowing medium is nitrogen, the flow is 60-80 Nm < 3 >/h, the gun is put into the molten iron for air stirring, and air blowing is carried out for 10-20 min; adding a desulfurizing agent to desulfurize the molten iron and slagging off; adding 400-800kg of oxidizing agent, stirring with nitrogen for 8-15 minutes, slagging off after the treatment is finished, and reducing the content of Mn in the molten steel to be less than or equal to 0.15%; comprising the following steps: carrying out primary deslagging when blowing is carried out to 25-35%; blowing until the oxygen supply intensity is greater than or equal to 80%, increasing the oxygen supply intensity to 3.3-3.7 Nm < 3 >/(t.min), and adding 2.0-4.0 kg of pellet ore per ton of steel; blowing is continued for 30-90 S after the lance appears