DC06 IF钢精炼渣成分优化及钢-渣中氧的控制  

Composition optimization of DC06 IF steel refining slag and control of oxygen in steel and slag

作　　者：王宝[1] 李任春 刘俊山 成日金[1,3] 张华 倪红卫[1] WANG Bao;LI Renchun;LIU Junshan;CHENG Rijin;ZHANG Hua;NI Hongwei(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Hanbao Steelmaking Plant,HBIS Group Hansteel Company,Handan 056001,Hebei,China;Technical Center,HBIS Group Hansteel Company,Handan 056001,Hebei,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,湖北武汉430081 [2]河北钢铁集团邯钢分公司邯宝炼钢厂,河北邯郸056001 [3]河北钢铁集团邯钢分公司技术中心,河北邯郸056001

出　　处：《钢铁研究学报》2021年第4期293-301,共9页Journal of Iron and Steel Research

基　　金：国家自然科学基金面上资助项目(51774217);耐火材料与冶金国家重点实验室开放基金资助项目(2018QN03)。

摘　　要：无间隙原子钢(IF钢)对含铝夹杂物要求极为严格。为冶炼洁净IF钢,采用热力学软件FactSage 7.0对IF钢精炼渣系做了优化计算,并采取6组工业实验做验证,根据结果提出改进措施。实验中采取氧传感器、碳硫分析仪及ICP-AES对钢和渣成分进行检测,并通过ASPEX自动扫描电子显微镜检测钢中夹杂物成分与数量。热力学计算及实验研究发现,转炉脱碳结束时钢液中碳质量分数宜控制在0.04%,转炉渣中FeO质量分数控制在14.9%以内,降低钢中[O]质量分数到470×10^(-6)。精炼时控制补吹氧炉次比在64%以下,补吹量在17 m^(3)内,精炼渣中SiO_(2)、MgO及TFe质量分数分别控制在6%~8%、6%和5%~10%,钙铝比控制在1.4~1.6时,钢中[O]质量分数可控制在10×10^(-6),且该精炼渣系对Al_(2)O_(3)有较好的吸附性。在确保精炼脱氧的同时,降低钢液二次氧化,达到IF钢洁净冶炼目的。Interstitial free atomic steel(IF steel) has extremely strict requirements for aluminum inclusions. In order to smelt clean IF steel, the thermodynamic software FactSage 7.0 was used to optimize the calculation of IF steel refining slag system, and six groups of industrial experiments were carried out to verify the calculation. According to the results, improvement measures were proposed. In the experiment, oxygen sensor, carbon sulfur analyzer and ICP-AES were used to detect the composition of steel and slag, and the composition and quantity of inclusions in steel were detected by ASPEX automatic scanning electron microscope. The results of thermodynamic calculation and experimental study show that the carbon content in molten steel should be controlled at 0.04 mass% at the end of converter decarburization, FeO content in converter slag should be kept within 14.9 mass%, and dissolved oxygen content in steel should be reduced to 470×1^(0-6). During refining, the furnace ratio of supplemental blowing of oxygen to refining furnace should be controlled below 64%, and the amount of secondary oxygen blowing should be controlled within 17 m^(3), the content of SiO_(2) in refining slag should be controlled at 6 mass%-8 mass%, MgO content and TFe content should be controlled at 6 mass% and 5 mass%-10 mass%, respectively, and the ratio of CaO to Al2O3 should be controlled at 1.4-1.6, so the content of dissolved oxygen in steel can be controlled at 10×10^(-6), and the refining slag system has better adsorption on Al_(2)O_(3). At the same time of refining deoxidization, the secondary oxidation of molten steel is reduced to achieve the purpose of clean smelting of IF steel.

关 键 词：无间隙原子钢 精炼渣 热力学 夹杂物 脱氧 

分 类 号：TF713.3[冶金工程—钢铁冶金]