工程科学学报，第37卷，第3期：307-311,2015年3月 Chinese Journal of Engineering,Vol.37,No.3:307-311,March 2015 DOI:10.13374/j.issn2095-9389.2015.03.007:http://journals.ustb.edu.cn F钢铸坯厚度方向洁净度演变 王 敏12，包燕平1》，杨荃2”，赵立华》，林路》 1)北京科技大学钢铁治金新技术国家重点实验室，北京100083 2)北京科技大学国家板带生产先进装备工程技术研究中心，北京100083 3)北京科技大学治金与生态工程学院，北京100083 ☒通信作者，E-mail:worldmind@l63.com 摘要采用夹杂物原貌分析、扫描电镜和能谱分析、氧氮分析等手段系统分析了F钢铸坯全厚度方向的洁净度变化及夹 杂物分布规律.铸坯厚度方向全氧(T.0)和N质量分数平均值均为17×106.内、外弧表层1/16内T.0、N均高于平均值 5%~10%,存在夹杂物聚集带：内弧1/4至外弧1/4区域T.0、N水平低于平均值5%~10%：表层116至1/4区域接近平均 水平.共统计夹杂物963个，夹杂物平均粒径5.7μm,<5μum占60%，<10μm占90%：A山，0，夹杂主要存在表层5mm内，尺 寸在2~10μm:TiN-A山，0，和TiN粒子主要在距离表层5~80mm,尺寸随深度增加而增大：TiN-TiS和TiS夹杂主要在距离表 面80-130mm,尺寸1-5um.从铸坯表层到中心主要夹杂物的分布依次是A山，0g、A山0，-TiN、TiN、TN-TiS、TiS和MnS. 关键词板坯：洁净度；夹杂物：分布：氮化钛 分类号TF762 Cleanliness evolution of interstitial free (IF)steel slabs in the thickness direction WANG Min',BAO Yan-ping',YANG Quan2,ZHAO Li-hua,LIN Lu') 1)State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing.Beijing 100083,China 2)National Engineering Research Center of Flat Rolling Equipment,University of Seience and Technology Beijing,Beijing 100083,China 3)School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:worldmind@163.com ABSTRACT The cleanness evolution and inclusion distribution of IF slabs in the thickness direction were studied by original mor- phology analysis,scanning electron microscopy and energy spectroscopy analysis,and total oxygen (T.O)and nitrogen analysis.The average values of mass fraction of total oxygen and N in the slabs in the thickness direction are within 17x10.The mass fractions of T.O and N in the area within 1/16 thickness from the slab surface are 5%to 10%higher than the average values,in the area between 1/4 thickness from the inner arc and 1/4 thickness from the outer arc are 5%to 10%lower than the average values and in other area are close to the average levels.The average size of inclusions is 5.7 um based on a total of 963 statistical inclusions.Inclusions with the particle size smaller than 5 um account for 60%and with the particle size smaller than 10 um account for 90%.Al,O,mainly exits within 5 mm from the slab surface with the size of 2 to 10 um:TiN-Al2O,and TiN exist in the area from 5 to 80 mm in the thickness direction,and their particle size grows up as the thickness increasing:TiN-TiS and TiS inclusions mainly exist in the area from 80 to 130 mm in the thickness direction with the size of I to 5um.Inclusions from the slab surface to center are mainly Al2O3,Al2OTiN, TiN,TiN-TiS,TiS,and MnS in order. KEY WORDS slabs:cleanliness:inclusions:distribution:titanium nitride 收稿日期：2013-11-29 基金项目：中央高校基本科研业务费资助项目(FR℉-TP4一25A2):国家自然科学基金资助项目(51404018)：钢铁治金新技术国家重点实验 室基金资助项目(KF1309).工程科学学报，第 37 卷，第 3 期: 307--311，2015 年 3 月 Chinese Journal of Engineering，Vol． 37，No． 3: 307--311，March 2015 DOI: 10． 13374 /j． issn2095--9389． 2015． 03． 007; http: / /journals． ustb． edu． cn IF 钢铸坯厚度方向洁净度演变 王 敏1，2) ，包燕平1，3) ，杨 荃2) ，赵立华1，3) ，林 路1，3) 1) 北京科技大学钢铁冶金新技术国家重点实验室，北京 100083 2) 北京科技大学国家板带生产先进装备工程技术研究中心，北京 100083 3) 北京科技大学冶金与生态工程学院，北京 100083  通信作者，E-mail: worldmind@ 163． com 摘 要 采用夹杂物原貌分析、扫描电镜和能谱分析、氧氮分析等手段系统分析了 IF 钢铸坯全厚度方向的洁净度变化及夹 杂物分布规律． 铸坯厚度方向全氧( T． O) 和 N 质量分数平均值均为 17 × 10 － 6 ． 内、外弧表层 1 /16 内 T． O、N 均高于平均值 5% ～ 10% ，存在夹杂物聚集带; 内弧 1 /4 至外弧 1 /4 区域 T． O、N 水平低于平均值 5% ～ 10% ; 表层 1 /16 至 1 /4 区域接近平均 水平． 共统计夹杂物 963 个，夹杂物平均粒径 5. 7 μm，＜ 5 μm 占 60% ，＜ 10 μm 占 90% ; Al2O3夹杂主要存在表层 5 mm 内，尺 寸在 2 ～ 10 μm; TiN--Al2O3和 TiN 粒子主要在距离表层 5 ～ 80 mm，尺寸随深度增加而增大; TiN--TiS 和 TiS 夹杂主要在距离表 面 80 ～ 130 mm，尺寸 1 ～ 5 μm． 从铸坯表层到中心主要夹杂物的分布依次是 Al2O3、Al2O3--TiN、TiN、TiN--TiS、TiS 和 MnS． 关键词 板坯; 洁净度; 夹杂物; 分布; 氮化钛 分类号 TF762 收稿日期: 2013--11--29 基金项目: 中央高校基本科研业务费资助项目( FＲF--TP--14--125A2) ; 国家自然科学基金资助项目( 51404018) ; 钢铁冶金新技术国家重点实验 室基金资助项目( KF13--09) ． Cleanliness evolution of interstitial free ( IF) steel slabs in the thickness direction WANG Min1，2)  ，BAO Yan-ping1，3) ，YANG Quan2) ，ZHAO Li-hua1，3) ，LIN Lu1，3) 1) State Key Laboratory of Advanced Metallurgy，University of Science and Technology Beijing，Beijing 100083，China 2) National Engineering Ｒesearch Center of Flat Ｒolling Equipment，University of Science and Technology Beijing，Beijing 100083，China 3) School of Metallurgical and Ecological Engineering，University of Science and Technology Beijing，Beijing 100083，China  Corresponding author，E-mail: worldmind@ 163． com ABSTＲACT The cleanness evolution and inclusion distribution of IF slabs in the thickness direction were studied by original mor￾phology analysis，scanning electron microscopy and energy spectroscopy analysis，and total oxygen ( T． O) and nitrogen analysis． The average values of mass fraction of total oxygen and N in the slabs in the thickness direction are within 17 × 10 － 6 ． The mass fractions of T． O and N in the area within 1 /16 thickness from the slab surface are 5% to 10% higher than the average values，in the area between 1 /4 thickness from the inner arc and 1 /4 thickness from the outer arc are 5% to 10% lower than the average values and in other area are close to the average levels． The average size of inclusions is 5. 7 μm based on a total of 963 statistical inclusions． Inclusions with the particle size smaller than 5 μm account for 60% and with the particle size smaller than 10 μm account for 90% ． Al2O3mainly exits within 5 mm from the slab surface with the size of 2 to 10 μm; TiN--Al2O3 and TiN exist in the area from 5 to 80 mm in the thickness direction，and their particle size grows up as the thickness increasing; TiN--TiS and TiS inclusions mainly exist in the area from 80 to 130 mm in the thickness direction with the size of 1 to 5 μm． Inclusions from the slab surface to center are mainly Al2O3，Al2O3--TiN， TiN，TiN--TiS，TiS，and MnS in order． KEY WOＲDS slabs; cleanliness; inclusions; distribution; titanium nitride