Method for making low-impurity steel with scrap steel as raw material

Method for making low-impurity steel with scrap steel as raw material

  • CN 105,648,145 A
  • Filed: 01/18/2016
  • Published: 06/08/2016
  • Est. Priority Date: 01/18/2016
  • Status: Active Application
First Claim
Patent Images

1. utilize the method that steel scrap carries out electric-arc furnace steelmaking, including:

  • 1) steelmaking feed refined in electric arc furnace molten steel;

         2) add cleanser and carry out impurity removing refining;

         3) tapping, casts molten steel, obtains steel;

    It is characterized in that, step

         1) in, described steelmaking feed, by weight, for;

    30-70 part slag, 10-15 part bean steel, the discarded steel of 5-10 part rolling and 30-50 part steel-making dedusting ash;

    In the process of described refining molten steel, being dividedly in some parts Calx slag making, the total amount of Calx is the 3.2-4% of raw material weight, carries out either shallow oxygen blast when melting sources 65�



    70% and fluxes, and oxygen pressure is 0.30-0.35MPa;

    Step

         2) in, described cleanser, by weight, including;

    0.5-1.4 part quick lime, 0.9-1.5 part light dolomite, 0.6-1.0 part silicon calcium powder and 0.7-1.2 part chromium nitride;

    In described refining process, when liquid steel temperature is increased to 1550 DEG C, carrying out degree of depth oxygen decarburization, oxygen pressure is 0.85�



    0.90MPa.

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