汽车板中大尺寸钙铝酸盐类夹杂来源及控制工艺

doi:10.13228/j.boyuan.issn0449-749x.20230125

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (0 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract In recent years, the high quality automotive panel users both domestically and internationally have demanded "zero defects" for the cold-rolled steel sheet, galvanized steel sheet, and other products for automotive panels. The appearance of large-size calcium aluminate inclusions in the steel is the main cause of the defects in IF cold-rolled steel plates. In the subsequent stamping process of steel plates, these large-size inclusions may result in cracking during stamping. In order to solve the problem of large size calcium aluminate inclusions in cold rolled IF steel sheet for automobile, the source and control of calcium aluminate inclusions in cold rolled IF steel sheet in a domestic steel plant were studied. Firstly, the morphology and composition of large size calcium aluminate inclusions were analyzed by SEM and EDS, and it was determined that the ladle slag was the main source of calcium aluminate inclusions. The control process research of RH refining top slag modification, ladle slag quantity optimization, high weir in tundish and high level molten steel operation has been carried out. By increasing the w((CaO))/w((Al₂O₃))of slag to reduce the FeO activity in slag, the surface tension of slag can be improved, and the aggregation of Al₂O₃ inclusion particles can be inhibited. High weir structure was established in the tundish, and molten steel sampling analysis found that the number density of larger than 5 μm inclusions is 7.83/mm² and 5.57/mm² front and back of the weir,respectively. When the high liquid level operation of molten steel in tundish is applied, it was found that the average residence time increased by 30.3 s when the liquid level was increased by 140 mm. Based on the above key control measures, the stable control of large size calcium aluminate inclusions in IF steel cold-rolled automobile sheet was achieved, and the defect occurrence rate was reduced.

Key words： automobile sheet calcium aluminate inclusions RH refining top slag modification tundish high weir slag modification

Received: 16 March 2023

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	ZENG Li
	LUO Yanzhao
	LIU Yanqiang
	ZHAO Changliang
	JI Chenxi
	XU Haiwei

Cite this article:

ZENG Li,LUO Yanzhao,LIU Yanqiang等. Control technology and source of large-size calcium aluminate inclusions in automobile sheets[J]. Iron and Steel, 2023, 58(10): 67-74.

URL:

http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20230125 OR http://www.chinamet.cn/Jweb_gt/EN/Y2023/V58/I10/67

[1] JI Y Q, LIU C Y, LU Y, et al. Effects of FeO and CaO/Al₂O₃ ratio in slag on the cleanliness of Al-killed steel[J]. Metallurgical and Materials Transactions B, 2018, 49: 3127.
[2] ABDULSALAM M, JACOBS M, WEBLER B A. Automated detection of non-metallic inclusion clusters in aluminum-deoxidized steel[J]. Metallurgical and Materials Transactions B, 2021, 52: 3970.
[3] 王博,吴晓燕,朱立光,等. 连铸坯表层夹杂轧制过程演变行为[J]. 中国冶金, 2019, 29(3): 5. (WANG B, WU X Y, ZHU L G, et al. Evolution behavior of slab surface inclusion during rolling process[J]. China Metallurgy, 2019, 29(3):5.)
[4] 谢利奎, 王睿, 闫志杰, 等. 界面活性元素对低碳钢连铸过程水口结瘤的影响[J]. 中国冶金, 2022, 32(3): 17. (XIE L K, WANG R, YAN Z J, et al. Effect of interface active elements on nozzle clogging in low-carbon steel continuous casting process[J]. China Metallurgy, 2022, 32(3): 17.)
[5] 黄日康, 张立峰, 姜仁波, 等. 超低碳铝脱氧钢中FeO_x对水口结瘤的影响[J]. 钢铁, 2021, 56(1): 43. (HUANG R K, ZHANG L F, JIANG R B, et al. Effect of FeO_x in an ultra-low carbon Al-killed steel on nozzle clogging[J]. Iron and Steel, 2021, 56(1): 43.)
[6] 王畅, 于洋, 倪有金, 等. IF钢轿车外板表面短线缺陷形成机理及改进措施[J]. 中国冶金, 2022, 32(10): 97. (WANG C, YU Y, NI Y J, et al. Forming mechanism and improvement measures of short line defects on IF steel car outer plate[J]. China Metallurgy, 2022, 32(10): 97.)
[7] 刘丽华, 职建军. 汽车板夹杂缺陷的原因分析及防止措施[J]. 宝钢技术, 2019(5): 4. (LIU L H, ZHI J J. Cause analysis of the inclusions in automotive sheet steels and improvement measures[J]. Baogang Technology, 2019(5):4.)
[8] 李源源, 张炯明, 崔衡, 等. IF钢连铸开浇工艺对头坯洁净度影响的研究[J]. 工程科学学报, 2023, 45(6): 899. (LI Y Y, ZHANG J M, CUI H, et al. Effect of casting speed rising on the cleanliness of IF steel slab during the initial casting stage[J]. Chinese Journal of Engineering, 2023, 45(6):899.)
[9] 李玉娣, 江中块. IF钢非稳态连铸坯洁净度分析[J]. 连铸, 2022(2): 89. (LI Y D, JANG Z K. Research on cleanliness in unsteady casting slabs of IF steel[J]. Continuous Casting, 2022(2): 89.)
[10] XU J F, HUANG F X, WANG X H. Formation mechanism of CaS-Al₂O₃ inclusions in low sulfur Al-killed steel after calcium treatment[J]. Metallurgical and Materials Transactions B, 2016, 47(2): 1217.
[11] 李菲, 任强, 李雅翀. 钙处理及保护浇铸工艺对钢液洁净度影响[J]. 炼钢, 2016, 32(3): 6. (LI F, REN Q, LI Y C. Influence of calcium treatment and protective castingon steel cleanliness during continuous casting process[J]. Steelmaking, 2016, 32(3): 6.)
[12] HOU Z W, JIANG M, YANG E J, et al. Inclusion characterization in aluminum-deoxidized special steel with certain sulfur content under combined influences of slag refining, calcium treatment, and reoxidation[J]. Metallurgical and Materials Transactions B, 2018, 49: 3056.
[13] 吴松杰, 杨文, 张立峰, 等. 钙处理时机对LF-RH精炼过程Al₂O₃基夹杂物的影响[J]. 中国冶金, 2022, 32(1): 36. (WU S J, YANG W, ZHANG L F, et al. Effect of calcium treatment time on Al₂O₃ based inclusions during LF-RH refining process[J]. China Metallurgy, 2022, 32(1): 36.)
[14] 缪新德, 于春梅, 石超民, 等. 轴承钢中钙铝酸盐夹杂物的形成及控制[J]. 工程科学学报, 2007, 29(8): 771. (MOU X D, YU C M, SHI C M, et al. Formation and controlling of calcium-aluminates inclusions in bearing steel[J]. Chinese Journal of Engineering, 2007, 29(8): 771.)
[15] 初仁生. 钢中高熔点钙铝酸盐类夹杂物聚集行为[J]. 钢铁, 2015, 50(7): 26. (CHU R S. Aggregation of inclusions for calcium aluminate with high-melting point[J]. Iron and Steel, 2015, 50(7): 26.)
[16] 刘珍童, 杨文, 任英, 等. 铝脱氧钢钙处理效果影响因素分析[J]. 钢铁, 2020, 55(3): 29. (LIU Z T, YANG W, REN Y, et al. Analysis of influencing factors on effect of calcium treatment in Al-killed steels[J]. Iron and Steel, 2020, 55(3): 29.)
[17] 秦正丰, 薛正良, 李金波, 等. 钙处理钢中大型球状及棒状夹杂的成因[J]. 钢铁, 2020, 55(5): 31. (QIN Z F, XUE Z L, LI J B, et al.. Origin of large spherical or bar-shaped inclusions in calcium treated steel[J]. Iron and Steel, 2020, 55(5): 31.)
[18] 音正元, 张立峰, 李超, 等. Q345D钢中含钙类夹杂物的演变和生成机理分析[J]. 钢铁, 2020, 55(11): 47. (YIN Z Y, ZHANG L F, LI Chao, et al.. Analysis of evolution and formation mechanism of calcium-containing inclusions of Q345D steel[J]. Iron and Steel, 2020, 55(11): 47.)
[19] DENG X X, LIU G L, WANG Q Q, et al. Effect of the weir structure in the tundish on the cleanliness of IF steels and elimination of spot-like defects in deep drawing automobile steel sheets[J]. Metallurgical Research and Technology, 2020, 117(6): 609.
[20] 马文俊, 李海波, 刘国梁, 等. 高等级汽车板中间包冶金技术[J]. 连铸, 2021(5): 99. (MA W J, LI H B, LIU G L, et al. Tundish metallurgical technology of advanced automotive sheet[J]. Continuous Casting, 2021(5): 99.)
[21] 罗衍昭,季晨曦,邓小旋,等. 优化保护渣提高超低碳IF钢表面质量[J]. 钢铁, 2017, 52(4): 38. (LUO Y Z, JI C X, DENG X X, et al. Optimization of mold flux to improve surface quality of ultra-low carbon IF steel[J]. Iron and Steel, 2017, 52(4): 38.)
[22] 罗衍昭,田志红,李向奎,等. 超低碳IF钢中夹杂物来源的示踪分析[J]. 中国冶金, 2019, 29(9): 56. (LUO Y Z, TIAN Z H, LI X K, et al. Analysis of inclusions source in ultra-low carbon IF steel by tracer method[J]. China Metallurgy, 2019, 29(9): 56.)
[23] 王宝, 李任春, 刘俊山, 等. DC06 IF 钢精炼渣成分优化及钢-渣中氧的控制[J]. 钢铁研究学报, 2021, 33(4): 293. (WANG B, LI R C, LIU J S, et al. Composition optimization of DC06 IF steel refining slag and control of oxygen in steel and slag[J]. Journal of Iron and Steel Research, 2021, 33(4): 293.)
[24] 于会香, 潘明, 杨德新. 超低碳IF钢脱氧合金化过程中夹杂物的行为[J]. 钢铁, 2020, 55(6): 46. (YU H X, PAN M, YANG D X. Behavior of inclusions in ultra-low carbon IF steel during deoxidation and alloying process[J]. Iron and Steel, 2020, 55(6): 46.)
[25] 温瀚, 周海忱, 罗衍昭, 等. RH加钛时机和纯循环时间对IF钢洁净度影响[J]. 中国冶金, 2022, 32(9): 45. (WEN H, ZHOU H C, LUO Y Z, et al. Effect of RH titanium adjustment time and pure circulation time on cleanliness of IF steel[J]. China Metallurgy, 2022, 32(9): 45.)
[26] 黄日康, 张立峰, 姜仁波, 等. 超低碳铝脱氧钢连铸过程钢中非金属夹杂物的演变[J]. 炼钢, 2020, 36(6): 39. (HUANG R K, ZHANG L F, JIANG R B, et al. Evolution of inclusions in ultra-low carbon Al-killed steel during continuous casting[J]. Steelmaking, 2020, 36(6): 39.)
[27] 黄日康, 姜仁波, 周秋月, 等. 超低碳钢中 Al-Ti-O 夹杂物的形貌演变和生成机理[J]. 工程科学学报, 2023, 45(5): 755. (HUANG R K, JIANG R B, ZHOU Q Y, et al. Morphology evolution and formation mechanism of Al-Ti-O inclusions in an ultra low carbon steel[J]. Chinese Journal of Engineering, 2023, 45(5): 755.)
[28] 朱坦华, 周秋月, 任英, 等. 二次氧化过程IF钢中间包中夹杂物演变行为[J]. 钢铁, 2020, 55(3): 35. (ZHU T H, ZHOU Q Y, REN Y, et al. Inclusion evolution in IF steel during tundish reoxidation[J]. Iron and Steel, 2020, 55(3):35.)
[29] 高帅, 王敏, 郭建龙, 等. IF 钢铸坯厚度方向夹杂物分布及洁净度评估[J]. 工程科学学报, 2020, 42(2): 194. (GAO S, WANG M, GUO J L, et al. Evaluation of cleanliness and distribution of inclusions in the thickness direction of interstitial free (IF) steel slabs[J]. Chinese Journal of Engineering, 2020, 42(2): 194.)
[30] 李大鹏. 宽板坯低碳钢专线化生产实践及动态精准控制[J]. 中国冶金, 2020, 30(2): 33. (LI D P. Specialized production practice and dynamic precision control of wide slab for low carbon steel[J]. China Metallurgy, 2020, 30(2): 33.)