Method for smelting ultra-low-carbon steel by using single-nozzle refining furnace

Method for smelting ultra-low-carbon steel by using single-nozzle refining furnace

  • CN 101,792,845 B
  • Filed: 11/20/2009
  • Issued: 10/03/2012
  • Est. Priority Date: 11/20/2009
  • Status: Active Grant
First Claim
Patent Images

1. method with the single-mouth refining furnace smelting suprelow carbon steel is that 1560 ℃



  • 1680 ℃

    , the carbon content of arriving at a station C are under 0.02%~

    0.08% the starting condition for 30mm~

    200mm, the liquid steel temperature that arrives at a station controlling out slag thick, carries out following steps;

    Step 1.1;

    through argon bottom-blowing or nitrogen molten steel is carried out deslagging earlier after molten steel arrives at a station;

    Argon flow amount or nitrogen flow are 3Nl/min ton steel~

    7.5Nl/min ton steel;

    Treat that the molten steel bare area reaches 30%~

    80%, argon flow amount or nitrogen flow are turned down to 0.3Nl/min ton steel~

    1.5Nl/min ton steel;

    Step 1.2;

    then single mouth stove soaking tub is inserted in the molten steel, the degree of depth that single mouth stove soaking tub inserts molten steel is 200mm~

    550mm;

    Step 1.3;

    vacuumize and make vacuum degree in vacuum chamber reach 40Pa~

    100Pa, and when carrying out vacuum, carry out the ladle bottom blowing argon gas, finish until the molten steel carbonization treatment.

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