10B21微合金钢生产工艺全流程洁净度分析  

Cleanliness analysis of the whole process of 10B21 microalloyed steel production process

作　　者：焦魁明 张亚兵 赵立 左小坦 王东兴 陈永峰 JIAO Kui-ming;ZHANG Ya-bing;ZHAO Li;ZUO Xiao-tan;WANG Dong-xing;CHEN Yong-feng(Institute of Research of Iron and Steel,Wuhu Xinxing Casting Pipe Co.,Ltd.,Wuhu 241002,Anhui,China)

机构地区：[1]芜湖新兴铸管有限责任公司钢铁研究院,安徽芜湖241002

出　　处：《连铸》2022年第5期69-75,共7页Continuous Casting

摘　　要：为了探究影响10B21钢生产稳定性的因素,提高钢材的质量,满足客户需求,对全流程洁净钢夹杂物进行取样分析。结果表明,全流程各工位的夹杂物的类型主要为7种类型,分别为CaO-Al_(2)O_(3)-MgO-CaS-TiN、CaO-Al_(2)O_(3)-MgO-CaS、Al_(2)O_(3)、MnS、MnS-Al_(2)O_(3)、Al_(2)O_(3)-TiN和MnS-TiN,除了转炉工位的样品夹杂物类型相对复杂,其余工位夹杂物主要是CaS-Al_(2)O_(3)-MgO-CaO-TiN,不同炉次氧氮含量波动较大,尤其是转炉终点氧含量控制不稳定,LF精炼过程中夹杂物变化幅度大,且软吹操作后生成尺寸为80~100μm的大型球状夹杂物,其主要成分是CaO-Al_(2)O_(3)-MgO-CaS-TiN,即以氧化钙氧化铝为形核中心外部伴生有氧化镁并被硫化钙以及氮化钛包裹的形式存在,该成分的夹杂物在LF精炼喂钙线后开始生成,由于精炼渣流动性低,对钢液覆盖效果差,易发生二次氧化,使得夹杂物在软吹阶段明显聚集长大。In order to explore the factors affecting the production stability of 10 B21 steel,improve the quality of steel and meet the needs of customers,the inclusions of clean steel in the whole process were sampled and analyzed.The results show that there are mainly seven types of inclusions in each station of the whole process,namely CaO-Al_(2)O_(3)-MgO-CaS-TiN,CaO-Al_(2)O_(3)-MgO-CaS,Al_(2)O_(3),MnS,MnS-Al_(2)O_(3),Al_(2)O_(3)-TiN and MnS-TiN.Except that the type of sample inclusions in converter station is relatively complex,the inclusions in other stations are mainly CaS-Al_(2)O_(3)-MgO-CaO-TiN.The oxygen and nitrogen content fluctuates greatly in different furnace times,especially the control of the oxygen content at the end of the converter is unstable,the inclusions change greatly in the LF refining process,and the size generated after soft blowing operation is 80-100μm,the main component of which is CaO-Al_(2)O_(3)-MgO-CaS-TiN.That is,with calcium oxide and alumina as the nucleation center,magnesium oxide is accompanied outside and wrapped by calcium sulfide and titanium nitride.The inclusions of this component begin to form after LF refining calcium feeding line.Due to the low fluidity of refining slag,poor coverage effect on liquid steel,secondary oxidation is easy to occur,resulting in the obvious aggregation and growth of inclusions in the soft blowing stage.

关 键 词：10B21钢 全流程 夹杂物 洁净钢 钢材质量 

分 类 号：TF76[冶金工程—钢铁冶金]