Stress Corrosion Cracking of X100 Pipeline Steel in Acid Soil Medium with SRB

doi:10.11902/1005.4537.2015.177

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (4): 321-327 DOI: 10.11902/1005.4537.2015.177

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Stress Corrosion Cracking of X100 Pipeline Steel in Acid Soil Medium with SRB

Jinheng LUO¹(

),Congmin XU²,Dongping YANG²

1. State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials, CNPC Tubular Goods Research Institute, Xi'an 710077, China
2. School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China

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Abstract

The effect of sulfate reducing bacteria (SRB) on stress corrosion cracking (SCC) behavior of X100 pipeline steel was investigated in artificial solution, which simulated the acid soil medium in the area of Yingtan at the Southeast China by means of slow strain rate test (SSRT) and scanning electron microscope (SEM). The results show that X100 pipeline steel has higher SCC susceptibility in the sterile artificial solution than that with SRB. The failure mode is transgranular cracking in both the two solutions. These results suggest that SRB inhibits the brittleness and reduces the SCC susceptibility of X100 pipeline steel, which may be ascribed to that SRB can breed rapidly and form a compact biofilm on X100 pipeline steel surface, then partly block the migration of corrosive Cl^- onto the X100 steel surface.

Key words: X100 pipeline steel stress corrosion cracking (SCC) sulfate reducing bacteria (SRB) acid soil

Received: 15 November 2015

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Cite this article:

Jinheng LUO,Congmin XU,Dongping YANG. Stress Corrosion Cracking of X100 Pipeline Steel in Acid Soil Medium with SRB. Journal of Chinese Society for Corrosion and protection, 2016, 36(4): 321-327.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.177 OR https://www.jcscp.org/EN/Y2016/V36/I4/321

Fig.1 SSRT curves of X100 pipeline steel in air (a) and Yingtan soil simulated solution (b) (M: parent metal sample; W: welded metal sample)

Table 1 Stress corrosion parameters and results of X100 pipeline steel in different mediums

Fig.2 SEM images of fracture surfaces of X100 pipeline steel after SSRT in air: (a) base metal macro-fracture; (b) weld metal macro-fracture; (c) base metal micro-fracture; (d) weld metal micro-fracture

Fig.3 SEM images of fracture surfaces of X100 pipeline steel after SSRT in Yingtan solutions without SRB (a1~a3) and with SRB (b1~b3)

Fig.4 SEM images of fracture surfaces of X100 pipeline steel weld samples after SSRT in Yingtan solutions without SRB (a1~a3) and with SRB (b1~b3)

Fig.5 SEM images of the side near fracture surfaces of X100 pipeline steel after SSRT in air: (a) basemetal; (b) weld metal

Fig.6 SEM images of the side near fracture surfaces of X100 steel after SSRT in Yingtan soil simulated solutions：(a) base metal in sterile solution; (b) base metal in SRB solution; (c) weld metal in sterile solution; (d) weld metal in SRB solution

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