含钛中碳钢中钛氧化物析出热力学分析  

Thermodynamic analysis of titanium oxide precipitation in titanium-containing medium carbon steel

作　　者：钟巍 操瑞宏 凌海涛 常立忠 仇圣桃[1,3] ZHONG Wei;CAO Ruihong;LING Haitao;CHANG Lizhong;QIU Shengtao(National Engineering Research Center of Continuous Casting Technology,Central Iron and Steel Research Institute,Beijing 100081,China;Xinyu Iron and Steel Co.,Ltd.,Xinyu 338001,Jiangxi,China;School of Metallurgical Engineering,Anhui University of Technology,Ma′anshan 243032,Anhui,China)

机构地区：[1]钢铁研究总院连铸技术国家工程研究中心,北京100081 [2]新余钢铁股份有限公司,江西新余338001 [3]安徽工业大学冶金工程学院,安徽马鞍山243032

出　　处：《钢铁研究学报》2021年第8期880-890,共11页Journal of Iron and Steel Research

摘　　要：以含钛中碳钢为研究对象,从热力学的角度分析了含钛中碳钢中钛氧化物析出行为,结果表明:浇注温度为(1 535±10)℃且钢中溶解氧含量大于0.003%(质量分数,余同)时,低钛中碳钢中的溶解Ti可与钢中的溶解氧反应生成Ti_(3)O_(5)、Ti_(2)O_(3),生成TiO_(2)、TiO夹杂的可能性较小;高钛中碳钢中的溶解Ti可与钢中的溶解氧反应生成Ti_(3)O_(5)、Ti_(2)O_(3)、TiO_(2)和TiO夹杂;同时钢中的溶解Ti能够还原钢中的SiO_(2)、MnO、Cr_(2)O_(3)夹杂物并生成TiO_(2)夹杂;低钛中碳钢中不会生成TiC、TiN、TiS和Ti_(4)C_(2)S_(2)夹杂;高钛中碳钢中可能会生成TiN和Ti_(4)C_(2)S_(2)夹杂。对于低钛中碳钢,控制钢中较低的溶解氧含量(<0.002%),对于高钛中碳钢,控制钢中较低的溶解氧含量(<0.000 7%)及较少的Cr_(2)O_(3)、MnO、SiO_(2)夹杂数量,可有效抑制含钛中碳钢中高熔点含钛夹杂物的生成,实现中碳钢低成本钛合金化及相关连铸工艺开发。The behavior of titanium oxide precipitation in titanium-containing medium carbon steel was analyzed according to thermodynamic analysis. The results show that when the pouring temperature is(1 535±10) ℃ and the dissolved oxygen content in the steel is greater than 0.003 mass%, the dissolved Ti in the low-titanium medium carbon steel can react with the dissolved oxygen in the steel to form Ti_(3)O_(5) and Ti_(2)O_(3), and the possibility of generating TiO_(2) and TiO inclusions is small. The dissolved Ti in the high-titanium medium carbon steel can react with the dissolved oxygen to form Ti_(3)O_(5), Ti_(2)O_(3), TiO_(2) and TiO. Meanwhile, the dissolved Ti in the steel can reduce the SiO_(2), MnO, Cr_(2)O_(3) inclusions in the steel and generate TiO_(2) inclusions. TiC, TiN, TiS and Ti_(4)C_(2)S_(2) inclusions will not be generated in low-titanium medium carbon steel. TiN and Ti_(4)C_(2)S_(2) inclusions may be generated in high-titanium medium carbon steel. For low titanium medium carbon steel, by controlling lower dissolved oxygen content(<0.002 mass%) and for high titanium medium carbon steel, by controlling lower dissolved oxygen content(<0.000 7 mass%) and less Cr_(2)O_(3), MnO and SiO_(2) inclusions can effectively inhibit the formation of high melting point titanium inclusions in titanium medium carbon steel, and realize low-cost titanium alloying and related continuous casting process development of medium carbon steel.

关 键 词：钛氧化物 含钛中碳钢 夹杂物 热力学 

分 类 号：TF71[冶金工程—钢铁冶金] TF72