中高碳铝镇静钢形成MnS塑性夹杂的工艺开发与实践

doi:10.13228/j.boyuan.issn0449-749x.20210210

Abstract
Figure/Table
References
Related Citation (15)

Download: PDF (1394 KB) HTML (1 KB)
Export: BibTeX | EndNote (RIS)

Abstract In order to improve the fatigue resistance of medium and high carbon steel products, based on the composition characteristics of medium and high carbon steel, the process which the heterogeneous nucleation of MnS in steel takes Al₂O₃ as nucleation particle is developed, and the brittle inclusions of Al₂O₃ in steel is wrapped by plastic MnS, the problem of fatigue fracture caused by brittle nonmetallic inclusion is solved. The composition design of key elements in steel, the design and development of refining and continuous casting integrated process were carried out by studying the formation conditions of fine and dispersed Al₂O₃ inclusions and the thermodynamic conditions of MnS heterogeneous nucleation and precipitation. Industrial practice shows that,the final deoxidation by aluminum with low activity oxygen can form 3-5 μm fine dispersed Al₂O₃inclusions, which act as the core of heterogeneous nucleation and precipitate dispersed and fine granular MnS at the solidification end of secondary dendrites; through gradient deoxidation, vacuum carbon deoxidation and protective casting, the total oxygen content in steel can be effectively controlled and the purity of molten steel can be improved,the average mass percent of T[O] of the finished product is 0.000 618%, which is 16% lower than 0.000 739% of the original process;the proportion of MnS and MnS wrapped Al₂O₃ inclusions is more than 96% of the total inclusions in the finished product,which is equivalent to the inclusion control level of the world′s leading products, considering that the Al₂O₃ inclusion wrapped by MnS must be thick enough for the plastic inclusion to work,the concept of "effective package rate" of MnS is established,while the maximum radius of hard inclusion was not more than 1/2 of radius of MnS wrapping part, it is considered that MnS realizes "effective wrapping" of hard phase inclusions;the average fracture toughness of the finished product is 83.47 MPa·m^1/2, which is 24% higher than 67.31 MPa·m^1/2 of the original process.

Key words： medium high carbon Al killed steel non-metallic inclusion MnS plastic inclusion heterogeneous nucleation MnS wrapped Al₂O₃

Received: 14 April 2021

	Service

	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	SHEN Chang
	LU Qiang
	GUO Jun-bo
	YANG Zheng

Cite this article:

SHEN Chang,LU Qiang,GUO Jun-bo等. Development and practice on forming MnS plastic inclusion in medium high carbon Al killed steel[J]. Iron and Steel, 2021, 56(12): 62-67.

URL:

http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210210 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I12/62

[1] 姜锡山. 钢中非金属夹杂物[M]. 北京:冶金工业出版社, 2011.(JIANG Xi-shan. Nonferrous Inclusion in Steel[M]. Beijing: Metallurgical Industry Press, 2011.)
[2] 徐国军, 胡华东, 田川, 等. Al₂O₃夹杂在DC06钢中的分布及对深冲性能的影响[J]. 中国冶金, 2021, 31(5): 111.(XU Guo-jun, HU Hua-dong, TIAN Chuan, et al. Distribution of Al₂O₃ inclusions in DC06 steel and its effect on deep drawing properties[J]. China Metallurgy, 2021, 31(5): 111.)
[3] 李明钢,刘润藻,林腾昌,等.GCr15轴承钢中非金属夹杂物的转变[J].钢铁研究学报,2014,26(5):56.(LI Ming-gang, LIU Run-zao, LIN teng-chang et al. Transformation of non-metallic inclusions in GCr15 bearing steel [J].Journal of Iron and Steel Research,2014,26(5):56.)
[4] 王博,姜周华,龚伟,等.GCr15轴承钢夹杂物及全氧含量控制工艺分析[J].材料与冶金学报,2004,3(2):90.(WANG Bo, JIANG Zhou-hua, GONG Wei, et al. Analysis of inclusions and total oxygen content control in bearing steel of GCr15 [J].Journal of Materials and Metallurgy,2004,3(2):90.)
[5] WANG L, YANG S, LI J, et al. Effect of Mg addition on the refinement and homogenized distribution of inclusions in steel with different Al contents[J]. Metallurgical and Materials Transactions B, 2017, 48(2):805.
[6] 周彦召,邹长东. 铝镇静特殊钢B类非金属夹杂物原因分析与控制[J]. 中国冶金, 2018, 28(4): 48.(ZHOU Yan-zhao,ZOU Chang-dong. Cause analysis and control of B type non-metallic inclusions of Al killed special steel[J]. China Metallurgy, 2018, 28(4): 48.)
[7] 陈然, 陈兆平, 徐迎铁,等. 轴承钢夹杂物行为的原位观察[J]. 钢铁研究学报, 2015, 27(12):48.(CHEN Ran,CHEN Zhao-ping, XU Ying-tie, et al. In-situ observation of behaviors of inclusions in bearing steel[J]. Journal of Iron and Steel Research, 2015, 27(12):48.)
[8] Xuan C, Karasev A V, Pär Göran Jönsson, et al. Attraction force estimations of Al₂O₃ particle agglomerations in the melt[J]. Steel Research International, 2017, 88(2):382.
[9] 陈家祥.钢铁冶金学[M].北京:冶金工业出版社,2009.(CHEN Jia-xiang. Steel Metallurgy[M].Beijing:Metallurgical Industry Press, 2009.)
[10] 张志刚, 任英, 成功,等. 非调质钢中夹杂物生成热力学[J]. 中国冶金, 2020, 30(4): 23.(ZHANG Zhi-gang, REN Ying, CHENG Gong, et al. Thermodynamic of inclusion formation in non-tempered steel[J]. China Metallurgy, 2020, 30(4): 23.)
[11] Wakoh M, Sawai T, Mizoguchi S. Effect of S content on the MnS precipitation in steel with oxide nuclei[J]. ISIJ International, 1996, 36(8): 1014.
[12] Ohta H, Suito H. Characteristics of particle size distribution of deoxidation products with Mg, Zr, Al, Ca, Si/Mn and Mg/Al in Fe-10 mass%Ni alloy[J]. ISIJ International, 2006, 46(1):14.
[13] Ohta H, Suito H. Dispersion behavior of MgO, ZrO₂, Al₂O₃, CaO-Al₂O₃ and MnO-SiO₂ deoxidation particles during solidification of Fe-10 mass%Ni alloy[J]. ISIJ International, 2006, 46(1): 22.
[14] 林腾昌, 门兵, 程雄, 等. 热处理对铸态钢中硫化锰夹杂物的影响[J].中国冶金, 2021, 31(4): 48.(LIN Teng-chang, MEN Bing, CHENG Xiong, et al. Influence of heat treatment on MnS inclusion in as-cast steel[J]. China Metallurgy, 2021, 31(4): 48.)
[15] 雷少龙,姜敏,杨叠,等. Al脱氧钢中氧化物对MnS析出的影响[J].北京科技大学学报,2013,35(11):1443.(LEI Shao-long, JIANG Min, YANG Die, et al.Effect of oxides on MnS precipitation in aluminum-deoxidized steel[J].Journal of University of Science and Technology Beijing, 2013,35(11):1443.)
[16] Oh Y J,Lee S Y,Byun J S,et al. Non-metallic inclusions and acicular ferrite in low carbon steel[J]. Materials Transactions JIM,2000,41(12):1663.
[17] 宋波,毛璟红,王福明,等. 非调质钢中Ti脱氧产物析出行为[J].北京科技大学学报,2006,28(3):90.(SONG Bo, MAO Jing-hong, WANG Fu-ming, et al. Precipitation behavior of ti-deoxidized products in non-quenched and tempered steel [J]. Journal of University of Science and Technology Beijing, 2006, 28(3):90.)