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金属学报  2019, Vol. 55 Issue (6): 762-772    DOI: 10.11900/0412.1961.2018.00557
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高强耐蚀管钢点状偏析及带状缺陷的特征与演变
李博1,张忠铧2,刘华松1,罗明2,兰鹏1,唐海燕1,张家泉1()
1. 北京科技大学冶金与生态工程学院 北京 100083
2. 宝钢中央研究院钢管技术中心 上海 201900
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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摘要: 

基于钢坯源头对高强耐蚀管钢热轧材与调质材中发现的带状偏析缺陷进行了实验研究。利用OM、SEM、EDS、EPMA等手段,揭示了高强石油套管钢圆坯中存在的各种点状偏析特征及其与热轧管带状组织缺陷的联系,并分析了热轧管和调质管带状缺陷的成因及差异。结果指出,铸坯中存在斑块型和疏松型2类点状偏析,其中均存在较为严重的C、Cr、Mo、Mn等合金元素正偏析,前者偏析区域内还往往存在细小的枝晶亚结构。统计计算表明,铸坯中不同偏析类型在轧材中造成的带状缺陷宽度也明显不同,点状偏析是管材中难以消除的大尺度带状缺陷的源头。热轧管和调质管中带状缺陷组织中均存在明显的合金元素偏析,但前者为珠光体加贝氏体(P+B)组织带状,后者为颗粒型碳化物带状,两者对管材硬度均匀性有不同程度影响。

关键词 高强耐蚀管钢凝固组织点状偏析带状缺陷硬度    
Abstract

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 wordshigh strength corrosion resistant tube steel    solidification structure    spot segregation    banded defect    hardness
收稿日期: 2018-12-21      出版日期: 2019-04-01
ZTFLH:  TG142.1  
基金资助:国家自然科学基金项目(Nos.U1860111);国家自然科学基金项目(51874033)
通讯作者: 张家泉     E-mail: jqzhang@metall.ustb.edu.cn
Corresponding author: Jiaquan ZHANG     E-mail: jqzhang@metall.ustb.edu.cn
作者简介: 李 博,男,1993年生,硕士生

引用本文:

李博,张忠铧,刘华松,罗明,兰鹏,唐海燕,张家泉. 高强耐蚀管钢点状偏析及带状缺陷的特征与演变[J]. 金属学报, 2019, 55(6): 762-772.
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, 2019, 55(6): 762-772.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2018.00557      或      http://www.ams.org.cn/CN/Y2019/V55/I6/762

图1  铸坯与枝晶侵蚀取样示意图
图2  管材取样与检测位置示意图
图3  铸坯1/4横截面低倍侵蚀与代表性部位枝晶特征
图4  铸坯横截面自表及里不同位置枝晶形貌
图5  铸坯横截面上自表及里凝固二次枝晶间距变化
图6  铸坯点状偏析区域枝晶形貌与EPMA面扫描和线扫描分析结果
图7  热轧管和调质管带状组织侵蚀结果
图8  热轧管和调质管带状缺陷频率分布图
图9  热轧管带状组织SEM像
图10  热轧管带状组织EPMA面扫描和线扫描分析结果
图11  调质管带状组织形貌
图12  调质管壁内正常区域与条带区域的SEM像
PositionCFe
11.6398.37
21.7198.29
31.9098.10
41.8298.18
51.2398.77
61.3798.63
71.1698.84
表1  图12a中正常组织区域标识点成分EDS分析结果
图13  调质管带状组织EPMA面扫描和线扫描分析结果
图14  热轧管和调质管硬度分布
PositionCTiCrMnFeNbMo
12.346.7385.445.49
22.590.831.6894.90
32.111.3896.51
42.4697.54
51.3996.532.09
61.1198.89
表2  图12b中条带区域标识点成分EDS分析结果
图15  斑块型点状偏析和疏松型点状偏析形貌
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