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Acta Metall Sin  2020, Vol. 56 Issue (4): 385-399    DOI: 10.11900/0412.1961.2019.00372
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Novel Cu-Bearing Pipeline Steels: A New Strategy to Improve Resistance to Microbiologically Influenced Corrosion for Pipeline Steels
YANG Ke1,SHI Xianbo1,2(),YAN Wei1,2,ZENG Yunpeng1,SHAN Yiyin1,2,REN Yi3,4
1.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2.Key Laboratory of Nuclear Materials and Safety Assessment, Chinese Academy of Sciences, Shenyang 110016, China
3.Institute of Iron and Steel Research, Ansteel Group Corporation, Anshan 114009, China
4.State Key Laboratory of Metal Material for Marine Equipment and Application, Ansteel Group Corporation, Anshan 114009, China
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Abstract  

Microbiologically influenced corrosion (MIC) has been an important reason leading to the damage and failure of pipeline steels, bringing a great economic loss. Development of MIC resistant pipeline steel is a new strategy to mitigate MIC from the aspect of material itself, having important scientific significance and application value. By proper Cu alloying design to the traditional pipeline steels, aiming at continuous release of Cu ions to kill the bacteria and inhibit the formation of bacterial biofilm, a creative strategy for improving the MIC resistance of pipeline steels has been proposed. This article briefly introduces the MIC of pipeline steel and its research status, and then the research progress on alloy design, microstructure, mechanical properties, hydrogen induced cracking resistance and MIC resistance of novel Cu-bearing pipeline steels are reviewed, and the research results on MIC resistance of the novel Cu-bearing pipeline steels under the laboratory conditions are stressed, and finally the future tendency on research and development of this type of novel steels is suggested.

Key words:  pipeline steel      Cu alloying      microstructure      mechanical property      microbiologically influenced corrosion      hydrogen induced cracking     
Received:  04 November 2019     
ZTFLH:  TG142.1  
Fund: China Pipeline Research Organization(CPRO2018NO4);Doctoral Scientific Research Foundation of Liaoning Province(20180540083);Shenyang Science and Technology Research Funding(18-013-0-53);State Key Laboratory of Metal Material for Marine Equipment and Application Funding, Enterprise Cooperation Project of "Development of MIC Resistance Pipeline Steel"
Corresponding Authors:  Xianbo SHI     E-mail:  xbshi@imr.ac.cn

Cite this article: 

YANG Ke,SHI Xianbo,YAN Wei,ZENG Yunpeng,SHAN Yiyin,REN Yi. Novel Cu-Bearing Pipeline Steels: A New Strategy to Improve Resistance to Microbiologically Influenced Corrosion for Pipeline Steels. Acta Metall Sin, 2020, 56(4): 385-399.

URL: 

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00372     OR     https://www.ams.org.cn/EN/Y2020/V56/I4/385

Fig.1  Principle for chemical composition design of novel Cu-bearing pipeline steel (MIC—microbiologically influenced corrosion, HIC—hydrogen-induced cracking)
SteelCSiMnCuMoCrNiNb+V+TiSPFe
X80-Cu0.0310.131.091.060.310.320.320.050.00110.005Bal.
X800.0500.161.770.200.300.310.300.100.00100.005Bal.
X65-Cu0.0220.120.071.340.10-0.300.060.00200.005Bal.
X650.0600.131.640.010.10--0.060.00100.010Bal.
Table 1  Analyzed chemical compositions of novel Cu-bearing and traditional commercial pipeline steels
Fig.2  OM image of microstructure (a) and nano-sized Cu-rich phases (b) of X80-Cu pipeline steel[60]
Fig.3  OM image of microstructure (a) and nano-sized Cu-rich phases (b) of X65-Cu pipeline steel
Fig.4  Tensile stress-strain curves and impact fractured specimens (inset) of X80-Cu (1.0Cu, as-aged) and X80 pipeline steels[60]Color online
Fig.5  Mechanical properties of X65-Cu and X65 pipeline steels
Fig.6  CLSM images of stained live/dead sulfate reducing bacteria (SRB) on surfaces of X65 (a), rolled X65-Cu (b) and aged X65-Cu (c) steels after 14 d immersion in API-RP38 mediaColor online
Fig.7  SEM images of pits on the surfaces of commercial X65 (a), as-rolled X65-Cu (b) and aged X65-Cu (c) pipeline steels after 65 d immersion in the API-RP38 media
Fig.8  Pit depths and pit diameters of X65, as-rolled X65-Cu and aged X65-Cu pipeline steels after 65 d immersion in the API-RP38 mediaColor online
Fig.9  Surface SEM images of X80-Cu (a) and X80 (b) steels immersed in soil-extract solution with SRB for 20 d, after removal of the corrosion products[63]
Fig.10  Distributions of pit diameter on surfaces of X80-Cu and X80 steels immersed in soil-extract solution with SRB for 20 d

Steel

Pit density mm-2Maximum pit depth / μmAverage pit depth / μm
X80-Cu681.91.5±0.25
X8050823.68.3±6.8
Table 2  Pit densities and depths on X80-Cu and X80 steels after 20 d immersion in the soil-extract solution
Fig.11  3D images of the largest pits on X80-Cu (a) and X80 (b) steels after 20 d immersion in soil-extract solution with SRB[63]Color online
Fig.12  Biofilm thicknesses on X80-Cu (A1.0Cu) and X80 steels after exposure to P. aeruginosa suspension for 1, 3 and 5 d[60]
Fig.13  CLSM images of live/dead P. aeruginosa on surfaces of X80-Cu (a, c, e) and X80 (b, d, f) steels after 1 d (a, b), 3 d (c, d) and 5 d (e, f) immersions[60]Color online
Fig.14  SEM images of pits on surfaces of X80-Cu (a) and X80 (b) steels after 14 d immersion with P. aeruginosa[60]
Fig.15  Cross-section morphologies and EDS analyses of X80-Cu (a) and X80 (b) steels after 60 d exposure in SRB-inoculated NS4 solution[60]Color online
Fig.16  Shematic illustration of MIC resistance mechanism of Cu-bearing pipeline steel (ROS—reactive oxygen species)[60]Color online
Fig.17  Mechanism of Cu-bearing pipeline steel for improving hydrogen induced cracking (HIC) resistance (M/A—martensite/austenite)Color online
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