无缝管用低硅ST30A1钢LF精炼过程钢水硅含量控制

分析了低硅钢ST30Al（/%:0.06~0.10C,≤0.05Si,0.30~0.45Mn,≤0.015P,≤0.005S,0.025~0.050Al）在LF精炼过程中钢水回磷量、钢水铝含量、精炼渣二元碱度、精炼渣Al₂O₃含量等因素对钢水增硅量的影响,得出转炉下渣量、钢水铝含量、精炼炉渣碱度是影响增硅的主要因素。通过控制转炉下渣、降低原辅料中的硅含量、调整精炼渣中SiO₂、Al₂O₃含量、控制精炼渣二元碱度14,渣中Al₂O₃为27%,控制钢水铝含量0.010%~0.020%,LF钢水增硅量由原0.033%~0.047%降低到0.004%~0.018%,成品钢水硅含量≤0.035%。

Control of Silicon Content in Low Silicon Steel ST30A1 for Seamless Tube in LF Refining Process

The effect of factors including increasing phosphorus content in liquid, aluminium content in liquid, refining slag binary basicity, and Al₂O₃ content in refining slag on increasing silicon content in liquid of low silicon steel ST30A1 (/%: 0.06~0.10C, ≤0.05Si, 0.30~0.45Mn, ≤0.015P, ≤0.005S, 0.025~0.050Al) during LF refining process has been analyzed. It is obtained that the BOF tapping slag amount, liquid aluminium content and refining slag binary basicity are main factors to aflect the increasing silicon content in liquid. With controlling BOF tapping slag amount, decreasing silicon content in raw and auxiliary materials, adjusting the SiO₂ and Al₂O₃ content in refining slag to control refining slag binary basicity-14 and Al₂O₃ content in refining slag-27%, and controlling aluminium content in liquid 0.010%~0.020%, The increasing silicon content in LF liquid decreases from original 0.033%~0.047% to 0.004%~0.018%.