Composite modification material for reducing oxidizability of molten low-carbon-aluminum killed steel
A low-carbon aluminum killed steel and composite modification technology is applied in the field of ladle slag to achieve the effects of reducing oxidizability, reducing treatment costs and increasing the number of continuous pouring furnaces
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Embodiment 1
[0009] Embodiment 1, CaF in ladle slag modifier 2 、Al 2 o 3 , CaO, MgO, passivated calcium carbide (CaC 2 ), its weight percent content is respectively 13.0%, 16.0%, 51.5%, 4.5%, 15.0%; Al, CaF 2 、Al 2 o 3 , CaO, MgO, its weight percent content is respectively 23.0%, 9.0%, 29.0%, 26.0%, 13.0%, and the particle size range is 5~30 (mm). The present invention has adopted following control standard: 1) ladle slag modifier ton steel consumption 4.5kg / t, take the production mode of bulk material mixing, pack 10kg / bag (moisture-proof) plus ton bag, guarantee to meet production needs The mixing state is also convenient for on-site addition and use; 2) The amount of the ladle slag modification accelerator per ton of steel is 0.3kg / t, and the pre-melting method is used for production, which is conducive to the accurate use of the material.
Embodiment 2
[0010] Embodiment 2, CaF in ladle slag modifier 2 、Al 2 o 3 , CaO, MgO, passivated calcium carbide (CaC 2 ), its weight percent content is respectively 12.0%, 16.0%, 49.0%, 5.0%, 18.0%; Al, CaF 2 、Al 2 o 3 , CaO, MgO, its weight percent content is respectively 25.0%, 11%, 28.0%, 24.0%, 12.0%, and the particle size range is 5~30 (mm). The amount of ladle slag modifier used per ton of steel is 4.5kg / t, the amount of ladle slag modification accelerator used per ton of steel is 0.4kg / t, and the rest are the same as in Example 1.
Embodiment 3
[0011] Embodiment 3, CaF in ladle slag modifier 2 、Al 2 o 3 , CaO, MgO, passivated calcium carbide (CaC 2 ), its weight percent content is respectively 7.0%, 25.0%, 45.0%, 8.0%, 20.0%; Al, CaF 2 、Al 2 o 3 , CaO, MgO, its weight percent content is respectively 20.0%, 10.0%, 30.0%, 30.0%, 10.0%, and the particle size range is 5~30 (mm). The amount of ladle slag modifier used per ton of steel is 4.5kg / t, the amount of ladle slag modification accelerator used per ton of steel is 0.5kg / t, and the rest are the same as in Example 1.
[0012] Effect of use: 38 furnaces of low-carbon aluminum-killed steel were selected for testing. The original ∑(FeO+MnO) was 8-10%. There are 32 furnaces, the average (FeO+MnO)% is 3.13%, and the pass rate is 84.2%. Excluding the 3 furnaces that do not meet the test conditions due to abnormal conditions such as rhythm influence, the effective pass rate is 91.4%, meeting the goal of more than 80%. Require.
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