转炉-LF和铁水预处理-转炉-钢包吹氩对耐候钢冶金质量的影响

Effect of Converter-LF Refining and Hot Metal Pretreatment-Converter-Ladle Argon Stirring Process on Metallurgical Quality of Weathering-Resisting Steel

进行了60 t转炉(钢水温度1653℃)-LF精炼(渣碱度2.5～3.0、喂Al线、吹氩)和铁水预处理([S]≤0.010%)-60 t转炉(钢水温度1670℃,出钢过程加80～100 kg精炼渣)-钢包喂A1线、吹氩≥8 min两种工艺冶炼耐候钢SPA-H(%:≤0.12C、0.30～1.25Cr、0.25～0.55Cu)的试验。62炉生产结果表明,有LF精炼炉次吹氩前[O]37.7×10^(-6),喂丝量25 kg,平均[S]0.014%,无LF精炼吹氩前[O]53.3×10^(-6),喂丝量33.9 kg,平均[S]0.017%,两种工艺生产的耐候钢力学性能和夹杂物级别均达到要求,但无LF工艺有利于提高生产率,降低物料消耗。

Test to melt weathering-resisting steel SPA-H （% ： ≤0. 12C, 0. 30 - 1.25Cr, 0. 25 - 0. 55Cu） by both processes of 60 t converter （ liquid temperature 1 653 ℃ ） - LF refining （slag basicity 2.5 - 3.0, feeding Al wire, Ar stir- ring） and hot metal pretreatment （ [ S] ≤0. 010% ）-60 t converter （liquid temperature 1 670 ℃, adding 80 - 100 kg refi- ning slag during tapping） -ladle feeding Al wire and Ar stirring ≥8 min has been carried out. Results by 62 heats practice show that for heats with LF refining, [ O ] before argon stirring is 37. 7 ×10-6, feeding wire 25 kg, average [ S ] is 0. 014% ; and for heats without LF refining, [ O] before argon stirring is 53.3 ×10-6, feeding wire 33.9 kg, average [ S] is 0. 017% ; the mechanical properties and inclusion rating of weathering-resisting steel produced by both processes all meet the requirement, but the process without LF refining is available to increase productivity and reduce consumption of materials.