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

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。

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

Test to melt weathering-resisting steel SPA-H ( % : W0. 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 stirring) and hot metal pretreatment (S] ≤0. 010% ) -60 t converter (liquid temperature 1 670 °C , adding 80 ~ 100 kg refining 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 x 10 ^-6, feeding wire 25 kg, average S] is 0. 014% ； and for heats without LF refining, O] before argon stirring is 53. 3 X 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.