提高00Cr12Ti铁素体不锈钢钛回收率的工艺实践

Practice of Process to Increase Yield of Titanium in Ferrite Stainless Steel 00Cr12Ti

00Cr12Ti超低碳铁素体不锈钢(%:≤0.030C、10.50～11.75Cr、6×C～0.75Ti)由90 t K-OBM-S转炉-90 t VOD-90 t LF-CC工艺冶炼。生产实践表明,随钢中自由氧含量(5～10)×10^(-6)和吹氩搅拌时间(1～12 min)增加,钛的收得率降低;LF喂钛线时钛的收得率高于VOD过程加块状钛合金;控制钢中全氧含量≤35×10^(-6),自由氧含量≤6×10^(-6),VOD过程(Cr_2O_3+FeO+MnO)≤1%,搅拌时间5～10 min,氩气流量50～80 L/min,用LF喂钛线工艺,可使钛的收得率达60%～75%。

Ultra-low carbon ferrite stainless steel 00Cr12Ti （ % ： ≤0. 030C, 10. 50 - 11.75Cr, 6 × C -0.75Ti） is melted by 90 t K-OBM-S converter - 90 t VOD - 90 t LF - CC process. Production practice show that with increasing free oxygen content in steel （5 - 10） × 10^- 6 and blowing argon stirring time （ 1 - 12 min） , the yield of titanium decreases; and the yield of titanium by feeding titanium wire in LF is higher than that by adding titanium alloy biscuit in VOD process ; with controlling total oxygen content in steel ≤35 × 10^- 6, free oxygen content ≤6 × 10^- 6, （Cr2O3 ＋ FeO ＋ MnO） ≤ 1% in VOD process, stirring time 5 - 10 min, argon flow rate 50 - 80 L/min, and using feeding titanium wire process in LF, the yield of titanium is up to 60% -75%.