Method for smelting low-sulfur steel by single-mouth refining furnace

Method for smelting low-sulfur steel by single-mouth refining furnace

  • CN 101,701,279 A
  • Filed: 11/20/2009
  • Published: 05/05/2010
  • Est. Priority Date: 11/20/2009
  • Status: Active Application
First Claim
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1. method with the single-mouth refining furnace smelting low-sulfur steel, control are arrived at a station under the starting condition of 1560 ℃



  • 1680 ℃

    of liquid steel temperatures, adopt the single-mouth refining furnace desulfurization, and concrete steps are as follows;

    Step 1, after arriving at a station, molten steel by argon bottom-blowing or nitrogen molten steel is carried out deslagging earlier, 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 2, in the molten steel in single mouth stove soaking tub insertion completing steps 1, the degree of depth that single mouth stove soaking tub inserts molten steel is 200mm~

    550mm;

    Step 3 vacuumizes and makes vacuum degree in vacuum chamber reach 40Pa~

    1000Pa;

    Step 4 adds reductor, and oxygen level is taken off to 4ppm~

    15ppm in molten steel, adds sweetening agent, simultaneously argon flow amount or nitrogen flow is increased to 3Nl/min ton steel~

    7.5Nl/min ton steel and stirs molten steel and carry out desulfurization, finishes until the molten steel processing.

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