摘要
试验Ti-IF钢(/%:≤0.003 5C,≤0.03Si,0.08~0.20Mn,≤0.025P,≤0.015S,0.05~0.07Ti,0.030~0.055Als,≤0.004 0N)BOF终点[C]0.03%~0.06%,终点[O]0.003 0%~0.060 0%,出钢过程加石灰和含Al钢包顶渣改质剂,RH终渣组成/%:53.38CaO,7.05FeO,1.01MnO,31.4Al_2O_3,5.7MgO,0.3P_2O_5,0.022S。RH精炼过程取样分析表明,通过加顶渣改质剂,控制8%(FeO+MnO),CaO/Al_2O_3=1.7,能较好去除钢中夹杂物,精炼过程钢中氧含量逐步下降,铸坯中氧含量为0.001 4%,氮含量为0.001 5%;脱碳结束时夹杂物主要为MnO;铝脱氧结束之后为Al_2O_3;合金化后为Al_2O_3及Al-O-Ti复合夹杂物;在铸坯中,前述夹杂物有效去除,但在凝固过程析出TiN夹杂。
Of tested Ti-IF steel（/% ：≤0.0035 C,≤0. 03 Si,0. 080. 20 Mn,≤0. 025 P,≤0. 015 S.0. 050.07 Ti,0.0300.055 Als,≤0.004 0 N）the BOF end [C] is0.03%0.06%,end [O] is 0.003 0% 0.006 0%,the lime and top slag modification agent containing aluminium are added during tapping process, and the ingredient of RH end slag is/% ： 53. 38 CaO, 7. 05 FeO,1. 01 MnO, 31. 4 Al2O3,5. 7 MgO, 0.3 P2O5,0.022 S. The analysis results by sampling in RH refining process show that by adding top slag modification agent to control 8%（ FeO ＋ MnO） and CaO/Al2O3 =1.7, it is available to remove the inclusions in steel; the oxygen content in liquid decreases continuously during refining process, in casting slab the oxygen content is 0.001 4% and the nitrogen content is 0.001 5%; at finishing decarburization the main inclusions in steel is MnO, at finishing deoxidation by aluminium the main inclusions in steel is Al2O3 and after alloying modified to Al2O3 and Al-O-Ti compound inclusions; and in slab casting the above-mentioned inclusions are removed effectively but the TiN inclusions precipitated in slab solidification process.
出处
《特殊钢》
北大核心
2017年第6期19-22,共4页
Special Steel
