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Acta Metall Sin  2019, Vol. 55 Issue (6): 762-772    DOI: 10.11900/0412.1961.2018.00557
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Characteristics and Evolution of the Spot Segregations and Banded Defects in High Strength Corrosion Resistant Tube Steel
Bo LI1,Zhonghua ZHANG2,Huasong LIU1,Ming LUO2,Peng LAN1,Haiyan TANG1,Jiaquan ZHANG1()
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2. Tube & Pipe Department, Baosteel Research Institute, Baoshan Iron & Steel Co. , Ltd. , Shanghai 201900, China
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C110 casing tube is one of the high strength corrosion resistant steel products for deep well oil exploration. Due to the co-existence of acidic media such as H2S and the high pressure, there are frequently sulfide stress corrosion cracking (SSC) failures produced in the tubes, which are supposed to be closely connected with their banded segregation defects. The relationship between the as-cast spot segregation and the following as-rolled banded defects, together with the impacts of quenching and tempering (QT) treatment have been revealed. The banded defects in high strength corrosion resistant oil tube have been studied experimentally from its very beginning of as-cast state. With aids of OM, SEM, EDS and EPMA observation and analysis, the various spot like segregations in round casting were revealed along with their following banded structure in both as-rolled and QT tubes. The mechanism and appearance of the segregation induced banded defects were investigated comparatively of the both tubes. It is pointed out that there are normally two kinds of spot like segregations in steel castings, speckle type and porosity type, respectively. There are not only severe positive segregations of solutes, such as C, Cr, Mo and Mn etc., in the macro-etched spot like areas, a finer dendritic sub-structure has also been observed in the speckle type spot segregation zones. It has been found that the width of the banded defects in the as-rolled tubes is closely related to the types of segregations, and the severe banded defects, which are difficult to remove by heat treatment, are recognized to originate directly from the spot like segregations. Solute segregations are found in the microstructure of banded defects of the both as-rolled and QT tubes but with different existences. A kind of pearlite plus bainite banded structure is present in the former tube, while the banded defect of latter is composed of concentrated granular carbides, which explains the difference of their hardness behavior.

Key words:  high strength corrosion resistant tube steel      solidification structure      spot segregation      banded defect      hardness     
Received:  21 December 2018     
ZTFLH:  TG142.1  
Fund: National Natural Science Foundation of China(Nos.U1860111);National Natural Science Foundation of China(51874033)
Corresponding Authors:  Jiaquan ZHANG     E-mail:

Cite this article: 

Bo LI,Zhonghua ZHANG,Huasong LIU,Ming LUO,Peng LAN,Haiyan TANG,Jiaquan ZHANG. Characteristics and Evolution of the Spot Segregations and Banded Defects in High Strength Corrosion Resistant Tube Steel. Acta Metall Sin, 2019, 55(6): 762-772.

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Fig.1  Sampling illustration for as-cast dendrite etching (unit: mm)
Fig.2  Tube sampling illustration for experimental analysis (unit: mm)(a) steel tube (b) sampling schematic (c) hardness measurement
Fig.3  Macro-etching and typical dendritic morphology of the round casting (1/4 cross section, A—equiaxed crystal, B—crossed dendrite, C—columnar crystal, dash circles show spot segregations)
Fig.4  As-cast dendritic morphologies of the round casting (From near surface No.1 to center No.9 shown in Fig.1)
Fig.5  Variation of the surface inward secondary dendrite spacing of the round casting (CET—columnar to equiaxed transition)
Fig.6  Dendritic morphology and EPMA analyses of map scanning (a) and line scanning (b) in the spot segregation zones
Fig.7  Banded structures of hot rolled (HR) tube (a) and high magnified image of it shown in Fig.7a (c), and quenching and tempering (QT) tube (b) (The lefts are the inner wall of the tubes and the rights are the center of their wall thickness)
Fig.8  Frequency distribution of the banded defects in the as-rolled and QT tubes
Fig.9  Low (a) and high (b) magnified SEM images of banded structure in hot rolled tube
Fig.10  Morphology and EPMA analyses of map scanning (a) and line scanning (b) on the banded structure of hot rolled tube
Fig.11  OM (a) and SEM (b) images of banded structure in QT tube
Fig.12  SEM images of the substrate (a) and banded (b) areas of QT tube
Table 1  EDS analyses of the tube substrate area in Fig.12a
Fig.13  EPMA analyses of map scanning (a) and line scanning (b) on banded structure of QT tube
Fig.14  Hardnesses of the hot rolled (a) and QT (b) tubes
Table 2  EDS analyses of tube banded area in Fig.12b
Fig.15  Morphologies of as-cast spot segregations of speckle type (a) and porosity type (b)
[1] Dong X M, Chen Y X, Zhang Z H. Corrosion behavior of H2S resistant steel in H2S solution [J]. Corros. Prot., 2016, 37: 832
[1] (董晓明, 陈业新, 张忠铧. 耐硫化氢腐蚀钢在硫化氢介质中的腐蚀行为 [J]. 腐蚀与防护, 2016, 37: 832)
[2] Tsay L W, Chi M Y, Chen H R, et al. Investigation of hydrogen sulfide stress corrosion cracking of PH 13-8 Mo stainless steel [J]. Mater. Sci. Eng., 2006, A416: 155
[3] Zhao M C, Shan Y Y, Li Y H, et al. Effect of microstructure on sulfide stress corrosion cracking of pipeline steels [J]. Acta Metall. Sin., 2001, 37: 1087
[3] (赵明纯, 单以银, 李玉海等. 显微组织对管线钢硫化物应力腐蚀开裂的影响 [J]. 金属学报, 2001, 37: 1087)
[4] Yin Y Q, Tang C X, Zhao J B, et al. Effect of microstructure characteristics on hydrogen sulfide corrosion resistance of X70MS pipe steel [J]. Heat Treat. Met., 2013, 38(5): 32
[4] (尹雨群, 唐春霞, 赵晋斌等. 组织特征对X70MS管线钢抗H2S腐蚀行为的影响 [J]. 金属热处理, 2013, 38(5): 32)
[5] Omura T, Kobayashi K. Hydrogen Embrittlement of OCTG and Linepipes [J]. Corros. Eng., 2011, 60(4): 156
[6] Zhang Z H, Liu M, Liu Y H, et al. A systematical analysis with respect to multiple hydrogen traps influencing sulfide stress cracking behavior of API-5CT-C110 casing steel [J]. Mater. Sci. Eng., 2018, A721: 81
[7] Vollmer L W. The behavior of steels in hydrogen sulfide environments [J]. Corrosion, 1958, 14(7): 38
[8] Urband B E, Morey S. High strength sour service C110 casing [A]. SPE/IADC Drilling Conference [C]. Amsterdam: Society of Petroleum Engineers (SPE), 1999: 14
[9] Haida O, Kitaoka H, Habu Y, et al. Macro- and semi-macroscopic features of the centerline segregation in CC slabs and their effect on product quality [J]. Trans. Iron Steel Inst. Jpn., 1984, 24: 891
[10] Ji Y, Lan P, Geng H, et al. Behavior of spot segregation in continuously cast blooms and the resulting segregated band in oil pipe steels [J]. Steel Res. Int., 2018, 89: 331
[11] Zhang Y L, Liu H Y, Ruan X J, et al. Microsegregation behaviors of alloy elements and their effects on the formation of banded structure in pinion steels [J]. J. Univ. Sci. Technol. Beijing, 2009, 31(suppl.): 199
[11] (张延玲, 刘海英, 阮小江等. 中低碳齿轮钢中合金元素的偏析行为及其对带状组织的影响 [J]. 北京科技大学学报, 2009, 31(suppl.): 199)
[12] Tian Y Q, Song J Y, Wei Y L, et al. Influence of controlled rolling and cooling on banded structure of J55 oil casing [J]. J. Plast. Eng., 2011, 18(6): 110
[12] (田亚强, 宋进英, 魏英立等. 控轧控冷工艺对J55石油套管用钢带状组织影响 [J]. 塑性工程学报, 2011, 18(6): 110)
[13] Oh K S, Chang Y W. Macro and microscopic segregation behavior of center segregations in high carbon steel CC blooms during the final stage of solidification [J]. Process. Technol., 1995, 13: 381
[14] Tsuchida Y, Nakada M, Sugawara I, et al. Behavior of semi-macroscopic segregation in continuously cast slabs and technique for reducing the segregation [J]. Trans. Iron Steel Inst. Jpn., 1984, 24: 899
[15] Xu Z G, Wang X H, Huang F X, et al. Solidification structure and semi-macro segregation of pipeline steel continuous casting slabs [J]. J. Univ. Sci. Technol. Beijing, 2014, 36: 751
[15] (许志刚, 王新华, 黄福祥等. 管线钢连铸板坯的半宏观偏析和凝固组织 [J]. 北京科技大学学报, 2014, 36: 751)
[16] Pre?linger H, Mayr M, Tragl E, et al. Assessment of the primary structure of slabs and the influence on hot-and cold-rolled strip structure [J]. Steel Res. Int., 2006, 77: 107
[17] Ji Y, He Q, Geng H, et al. Effect of dendritic structure on the spot segregation of continuously cast round bloom [A]. AISTech 2017-Proceedings of the Iron and Steel Technology Conference [C]. Nashiville: Association for Iron and Steel Technology (AISTECH), 2017: 2599
[18] Wang Q Y. Introduction to Metallurgical Technology [M]. Beijing: Metallurgical Industry Press, 2006: 104
[18] (王庆义. 冶金技术概论 [M]. 北京: 冶金工业出版社, 2006: 104)
[19] Chaube S, Tennyson G, Singh A. Modelling of columnar-to-equiaxed transition and inclusion distribution in continuously cast steel billets [J]. Trans. Indian Inst. Met., 2015, 68: 1207
[20] Ma X P, Li D Z. The 3-dimensional morphology of dendrite during equiaxed solidification of an Al-5 wt.% Cu alloy [J]. J. Mater. Sci. Technol., 2019, 35: 239
[21] Ji Y. Segregation of billet castings and its heredity effect on the hot-rolled products [D]. Beijing: University of Science & Technology Beijing, 2018
[21] (纪 元. 连铸坯偏析及其铸轧遗传性研究 [D]. 北京: 北京科技大学, 2018)
[22] Verhoeven J D. A review of microsegregation induced banding phenomena in steels [J]. J. Mater. Eng. Perform., 2000, 9: 286
[23] Krauss G. Solidification, segregation, and banding in carbon and alloy steels [J]. Metall. Mater. Trans., 2003, 34B: 781
[24] Kirkaldy J S, Von Destinon-Forstmann J, Brigham R J. Simulation of banding in steels [J]. Can. Metall. Quart., 1962, 1: 59
[25] Thompson S W, Howell P R. Factors influencing ferrite/pearlite banding and origin of large pearlite nodules in a hypoeutectoid plate steel [J]. Mater. Sci. Technol., 1992, 8: 777
[26] Kirkaldy J S, Purdy G R. Diffusion in multicomponent metallic systems: V. Interstitial diffusion in dilute ternary austenites [J]. Can. J. Phys., 1962, 40: 208
[27] Eckert J A, Howell P R, Thompson S W. Banding and the nature of large, irregular pearlite nodules in a hot-rolled low-alloy plate steel: A second report [J]. J. Mater. Sci., 1993, 28: 4412
[28] Gro?terlinden R, Kawalla R, Lotter U, et al. Formation of pearlitic banded structures in ferritic-pearlitic steels [J]. Steel. Res. Int., 1992, 63: 331
[29] Rivera-Díaz-Del-Castillo P E J, van Der Zwaag S, Sietsma J. A model for ferrite/pearlite band formation and prevention in steels [J]. Metall. Mater. Trans., 2004, 35A: 425
[30] Du C W. Study on surface microstructure and crack control of microalloyed continuous casting billet [D]. Beijing: University of Science and Technology Beijing, 2016
[30] (杜辰伟. 微合金连铸坯表层组织与裂纹技术控制研究 [D]. 北京: 北京科技大学, 2016)
[31] Yong Q L. Second Phase in Steel Material [M]. Beijing: Metallurgical Industry Press, 2006: 102
[31] (雍岐龙. 钢铁材料中的第二相 [M]. 北京: 冶金工业出版社, 2006: 102)
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