降低脱磷铁水-60t AOD-LF-150mm x150mm CCM冶炼0Cr13钢全氧含量的生产实践

采用CO二次燃烧、3.5%~5.0%Si高碳铬铁、合金烘烤等热补偿技术,降低了800kg还原产物SiO2以提高Si的脱氧能力;AOD炉渣碱度控制在2.3~2.4,并在AOD二次还原、LF精炼过程配比5kg/t活性石灰,可提高脱氧、脱硫效率30%以上;在CaO-SiO₂-MgO渣系（CaO）/（SiO₂）=2.2时,萤石的加入量控制在石灰总量的13%~17%时,炉渣粘稠度较好,对化渣、吸附夹杂有利,使Φ5.5mm线材全氧含量由优化前60×10^-6~90×10^-6降至30×10^-6~40×10^-6,S含量由原0.005%~0.010%降至0.003%~0.007%。

Production Practice of Decreasing Total Oxygen Content in Steel 0Crl3 Steelmaking by Dephosphorized Metal -60 t AOD-LF-150mm x150mm CCM

With the thermal compensation technology including using CO secondary burning, 3.5% ~5.0% Si high carbon ferrochromium and alloys baking, the reduced product SiO, decreases by 800 kg to increase the deoxidation ability of silicon； with controlling AOD slag basicity 2.3~2.4 and carried out secondary reduction in AOD refining, and adding 5 kg/t active lime in LF refining process, the efficiency of deoxidation and desulphurization increases by more than 30% ； and with ( CaO)/( SiO₂)= 2.2 of CaO-SiO₂-MgO slag series controlling adding amount of fluorite amounting to 13%~17% of the total lime to get better slag viscosity and be available to slagging and absorbing inclusions, the total oxygen content in Φ5.5 mm wire rod decreases to 30 x 10^-6 ~ 40 x 10^-6 from 60 x 10^-6~ 90 x 10^-6 before optimization and the S content decreases to 0.003% ~0.007% from original 0.005% ~ 0.010% .