钛微合金钢的合金化工艺实践
摘 要 含钛钢冶炼采片】钛铁 、钛线合金化冶炼实践 及热 力学分析 表明 ,钛 的钣化反应 造成钛收 得率 降低 ,钢 液中一定 的 Al含量可提高钛收得率 。通 过 48炉次试验分 别对两个 钢种 、两种 合金 化方式 和两种工 艺路 径 (EAr 和 BOF)进行钛收得 率考察 ,钛总收得牢 72.66% ~87.17% ,¨标 钛 含堪高 的钢种 (钢种 Ⅱ,0.05%Ti)钛总 收得率 (79.84% ~84.66% )高 于含量低 的钢 种 (钢 种 I,0.02%Ti)钛 收得率 (72.66% ~87.17% );钛铁合 金加 入钛 的收 得率 67.34% ~72.76% ,低 的出钢氧化性 可以提 高钛的收得率 ;钛线 喂人钛的收得率 78.62% ~85.12% ,钛 铁加钛 线合 金化 方式 由于喂线前炉渣 中钛 化合物 抑制 了钛 的渣一钢钛 氧化反应 ,喂线环 节钛收得 率 (83.49% ~85.12% ) 明显 高于单独 加钛线合金化钛收得率 (78.62% ~79.54% );熔 渣中 的钛 在 真空处理 环节 可以部分 还原进 入钢 水 , 由于 VD环节渣一钢还原动 力学 条件有利 于钛 的还原 ,钛还原率(28.05% ~44.04% )明显高 于 RH真空处理 顶渣钛 还原率 (<4% )。钢种 I及钢种 Ⅱ冶炼钛合金化 采用 LF喂钛线 +VD lr艺路线较 其它方式更为经济。
A bstract Ferrotitanium and ferrotitanium core(1 wire are always used f or Ti alloying in micro alloy steelmaking.prac— tices an(1 thermodynam ics analysis prove ̄J that there Ⅲe Ti 1OSS since the Ti oxidation.and Al in steel could increase the Ti yield. Analyses of 48 heats were taken to test the Ti alloying of 2 different steel grades with 2 alloying ways and different process route—EAF and BOF. Ti yield of all heats was in range ot’72.66% ~ 87.17% . The vieki of steel grade (steel grade II,0.05% Ti)with a higher Ti content(79.84% ~84.66% ) was higher than that with a lower Ti content(steel grade l,0.02% Ti) (72.66% ~87.17% ).Ti yiel ̄l of ferrotitanium alloying was 67.34% ~72.76% 。and lower the tap— ping steel oxidability could reduce the Ti losses. The Ti yield of ferrotitanium cored wire feeding was 78.62% ~ 85.12% . and Ti yield with the combination of ferrotitanium and wire feeding alloying process(83.49% ~85.12% ) was higher than that with only wire feeding f 78.62% ~79.54% )since the Ti oxidation in top slag after ferrotitanium alloying could inhibit the Ti oxidation during the wire feeding process. The Ti in slag could be reduced during the vacuum process.Ti yield of V1) process(28.05% ~44.04% ) was higher than that in the RH process(<4% )since it have a better Ti reduction kinetic condition. The only wire feeding on LF refining process plus VD process was the most eeonomical method of the Ti alloying for both steel g rades I and Ⅱ.
(1 University of Science and Technology_Beijing,School of MeMlurgicaI and Ecological Engineering,Beijing 1 00083; 2 Jiangyin Xingeheng Special Steel Works Co.,Ltd,Special Steel Plate Steel—making Plant,Jiangyin 2 1 4400)
关键词 钛微合金钢 钛合金化 工 艺路线 EAF—LF—VD BOF—LF—RH 收得 率
Ti Alloying Process Practice of Ti M icro Alloy Steelm aking
Liu Jigang 一,Miao Xinde! Ren Ying and Zhang Lifeng ,
第 40卷第 1期 · 52 · 2019年 2 J】 特殊 钢 ຫໍສະໝຸດ SPECIAI STEEr
Vo1.40.No.1 February 2019
钛 微 合 金 钢 的合 金 化 工 艺 实 践
刘 吉刚 缪新德 任 英 张 立峰 ’
(1北 京 科 技 大学 冶 金 与 qt念 程 学 院 ,北 京 100083;2江 阴兴 澄 特 种 钢铁 有 限 公 司特 板 炼 钢 分 厂 ,江 阴 214400)