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Effect of Martensite/Austenite (M/A) Constituent on H2S Resistance of High Strength Pipeline Steels |
SHI Xianbo1,2, WANG Wei1, YAN Wei1, SHAN Yiyin1, YANG Ke1() |
1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 2. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract Resistance to hydrogen sulfide (H2S) corrosion was studied for two X90 grade high strength pipeline steels with the same microstructure of acicular ferrite (AF). The results showed that the AF microstructure with fine martensite/austenite (M/A) constituent had better resistances to both hydrogen-induced cracking (HIC) and sulfide stress corrosion cracking (SSC). The larger size M/A constituent in AF microstructure deteriorated the H2S-resistance of the steels such as that with the decreasing pH value and increasing immersion time, the density of hydrogen-induced blisters on the steel surface increased and the HIC parameters increased, while its time-to-failure of SSC was shorter compared to the steel with finer M/A constituent. The different susceptibilities to H2S cracking of the two high strength pipeline steels were interpreted from the view points of size and quantity of M/A constituent, which was observed from the HIC propagation path by SEM. It is suggested that X90 pipeline steels for sour gas/oil service should have a lower amount of M/A constituent (<8%) and an effective M/A constituent size control (<2 μm) by TMCP as well as a proper chemical composition optimization, thereby to ensure their resistance to H2S.
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Received: 24 April 2014
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