帘线钢用镁炭质水口附着物物相及成因分析  

Analysis of the phase and formation of the attachment on the inner wall of magnesium-carbon SEN for the cord steel

作　　者：赵海峰 谢丹丹 杜芳林[1] ZHAO Haifengb;XIE Dandan;DU Fanglin(College of Materials Science and Engineering,Qingdao University of Science and-Technology,Qingdao 266042,China;Qingdao Hiworld Molten Control Co.,Ltd.,Qingdao 266200,China)

机构地区：[1]青岛科技大学材料科学与工程学院,山东青岛266042 [2]青岛正望钢水控制股份有限公司,山东青岛266200

出　　处：《炼钢》2021年第3期62-65,73,共5页Steelmaking

基　　金：国家自然科学基金资助项目(61504073)。

摘　　要：针对某钢厂帘线钢连铸过程中镁炭质浸入式水口(SEN)内壁出现灰白色附着物,该附着物在钢坯中形成夹杂导致后续加工过程产生拉丝断裂的问题,通过分析水口附着物的物相组成和微观形貌,发现水口附着物物相主要为Mg_(2)SiO_(4)(镁橄榄石,M_(2)S)及少量MgCaSiO_(4)(钙镁橄榄石,CMS)、Ca_(2)Mg(Si_(2)O_(7))(镁黄长石,C_(2)MS_(2)),探讨了水口中MgO与钢液中SiO_(2)和CaO等夹杂物反应生成附着物的过程及反应机制,据此,提出了优化镁炭质浸入水口材质、促进水口附着物低熔点化的改进思路。During the continuous casting of the cord steel process, some gray-white attachments were formed on the inner wall of the magnesium-carbon submerged entry nozzle(SEN),which would increase the risk of wire drawing fracture in the subsequent processing process. The phase composition and microstructure of the attachments were analyzed and the results showed that the phase of the attachments was mainly Mg2SiO4(forsterite, M_(2)S),MgCaSiO_(4)(monticellite, CMS),and Ca_(2)Mg(Si_(2)O_(7))(akermanite, C_(2)MS_(2)),etc. The formation process and mechanism of the attachments between the reaction of MgO(from the SEN) with SiO_(2) and CaO(mainly from molten steel) were discussed. An improved idea to optimize the material of magnesium-carbon SEN was put forward to promote the low melting point of nozzle attachment.

关 键 词：帘线钢 镁炭质浸入式水口 附着物 形成过程 

分 类 号：TF702[冶金工程—钢铁冶金]