A kind of preparation technology of the raw material with the anti-rotten steel of alloy composition

A kind of preparation technology of the raw material with the anti-rotten steel of alloy composition

  • CN 106,811,694 A
  • Filed: 11/28/2015
  • Published: 06/09/2017
  • Est. Priority Date: 11/28/2015
  • Status: Active Application
First Claim
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1. a kind of preparation technology of the raw material with the anti-rotten steel of alloy composition, it is characterised in that its main preparation technology includes:

  • 1. just refining is carried out using converter top bottom blowing;

    2. the molten steel for obtaining will be just refined to tap in ladle;

    3. pushing off the slag and pre-deoxidation are carried out in tapping process, and pushing off the slag causes the 3-5% that the total content into the FeO and MnO of ladle is the amount into the molten steel in ladle;

    4. pre-deoxidation is that, to addition ferro-aluminum deoxidier in molten steel, the pre-deoxidation causes that the oxygen content of molten steel is 10-100ppm;

    5. pair molten steel is refined, and molten steel enters refining furnace, and starting to vacuumize carries out application of vacuum;

    In vacuum, when vacuum reaches 3~30kpa, vacuum extractor is closed, be subsequently adding the pre-melted refining slag of 0.5~4kg/t steel, be then turned on vacuum extractor and proceed to refine application of vacuum;

    6. when molten steel is refined, the molten steel in ladle is carried out once to feed aluminium;

    7. once fed described in pair the molten steel after aluminium refined and carried out in refining it is secondary feed aluminium, at the same time, Cr, Ni, Cu, Ti etc. are added according to sequencing and ratio;

    8 removals swim in the solid on liquid steel level;

    The chemical composition of the anti-rotten steel steel billet of described alloy is by weight percentage:

    C;

    0.01%~0.04%;

    Si;

    0.01%~0.03%;

    Mn;

    0.1%~0.3%;

    P:

    0 <

    P≤

    0.02%;

    S:

    0 <

    S≤

    0.02%;

    Cr;

    0.02%~0.04%;

    Ni:

    0.004%~0.006%;

    Cu;

    0.005%~0.007%;

    Ti;

    0.004%~0.006%;

    Als;

    0.01%~0.03%;

    N;

    0.002%~0.003%;

    Remaining is Fe and inevitable impurity, amounts to 100%.

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