Stress corrosion cracking of microalloyed pipeline steel in biofuels E-10 and E-85. (2nd January 2019)

• Record Type: Journal Article
• Authors: Del-Pozo, A.; Torres-Islas, A.; Villalobos, J. C.; Sedano, A.; Martínez, H.; Campillo, B.; Serna, S.
• Is Part Of: Corrosion engineering, science, and technology. Volume 54:Number 1(2019)
• Page Start: 37
• Page End: 45
• Publication Date: 2019-01-02
• Subjects: Precipitation age hardening -- stress corrosion cracking -- slow strain rate test -- microalloyed steel; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1080/1478422X.2018.1523774
• Languages: English
• ISSNs: 1478-422X

Abstract

ABSTRACT: This paper evaluates the stress corrosion cracking (SCC) effect in gasohol E-10 and E-85 of X-70 experimental Ni-microalloyed steel, with different aging treatments (4–12 h at 600°C). The tension tests show that for all treatment periods, the samples tensile strength and elongation increase, with the largest increment exhibited by the samples undergoing 4 and 6 h of aging treatment. Microstructural analysis showed that the microstructure remains unchanged, the increase in tensile strength in the steel is directly related to the precipitation kinetics. The slow strain rate test (SSRT) shows that the steel under all conditions presents no susceptibility to SCC, thus reducing the area ranging from 83% to 90%, with predominantly ductile fractures. The results of the polarisation tests showed no signs of pitting corrosion, as well as a low corrosion rate for both media under study.