白云鄂博矿铌钛资源冶炼BT700L钢合金化工艺研究

特殊钢 ›› 2022, Vol. 43 ›› Issue (3): 25-29.

白云鄂博矿铌钛资源冶炼BT700L钢合金化工艺研究

董方, 丁来法, 宋金桥

内蒙古科技大学材料与冶金学院，包头014010

收稿日期:2022-08-25 出版日期:2022-06-01 发布日期:2022-06-16
作者简介:董方(1964-),男，硕士(1995年北京科技大学)，教授，1987年东北工学院(本科)毕业，冶金新工艺研究。
基金资助:
内蒙古自治区科技重大专项课题(zdzx2018032)资助

Research on BT700L Steelmaking and Alloying Process by Using Niobium and Titanium Resources in Bayan Obo Mine

DONG Fang, DING Laifa, SONG Jinqiao

School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010

Received:2022-08-25 Published:2022-06-01 Online:2022-06-16

摘要/Abstract

摘要： 通过FactSage热力学软件计算和实验室25 kg真空感应炉冶炼BT700L汽车大梁钢，探讨精炼渣对馄钛合金化的影响规律，并研究稀土貿钛复合合金的加入对钢组织、夹杂物、析出物的影响。结果表明,55%CaO~ 25%Al₂O₃ ~ 15%SiO₂ ~5%MgO,碱度为3.7的精炼渣更加适合BT700L汽车大梁钢的冶炼。添加该精炼渣后，钢水中的Ti和渣中的SiO₂反应,Si被还原进入钢中，钢中Ti含量减少,Si含最提高;实验钢的铸态组织由铁素体和少量贝氏体组成;稀土的加入降低了钢中夹杂物的数量和尺寸，并使钢中析出物更加弥散细小。

Abstract: Through FactSage thermodynamics software calculation and laboratory 25 kg vaccum-induction furnace smelting of BT700L automobile beam steel, the influence law of refining slag on the alloying of niobium and titanium is discussed and the effect of the addition of rare earth niobium-titanium composite alloy on steel structure, inclusions and precipitates is studied. The results show that the 55% CaO -25% Al₂O₃ ~ 15%SiO₂ ~5% MgO refining slag with a basicity of 3. 7 is more suitable for the smelting of BT700L automobile beam steel. After the refining slag added, Ti in the molten steel reacts with SiO₂ in the slag, Si is reduced into the steel, the Ti content in the steel decreases, and the Si content increases ； The cast structure of the experimental steel is composed of ferrite and a small amount of bainite ； The addition of rare earths reduces the number and size of inclusions in the steel, and makes the precipitates in the steel more dispersed and finer.

董方, 丁来法, 宋金桥. 白云鄂博矿铌钛资源冶炼BT700L钢合金化工艺研究[J]. 特殊钢, 2022, 43(3): 25-29.

DONG Fang, DING Laifa, SONG Jinqiao. Research on BT700L Steelmaking and Alloying Process by Using Niobium and Titanium Resources in Bayan Obo Mine[J]. Special Steel, 2022, 43(3): 25-29.