Stress Corrosion Cracking of SPV50Q Steel in H2S-Containing Sour Environment

Abstract:

It has a great tendency to the problem of environmental cracking under the service condition of LPG containing wet H2S surpassing the lowest allowance for steels. In order to quantitatively evaluate the cracking susceptibility on this steel in the wet H2S environment, the pre-fatigue crack M-WOL specimen stress corrosion cracking tests in three H2S concentrations were performed under the different welding conditions, and in safety performance analysis of equipment, and preventing countermeasure had been proposed. The results show that the presence of H2S considerably influences the corrosion process of SPV50Q steel and its corrosion rate increases with increasing H2S contents. With decreasing pH and increasing in temperature of the testing solution, the corrosion of this steel is also enhanced. Although the semicircular diameter of capacitive loop increases with immersion time, its variation amplitude is not obviously great and begins to diminish after certain periodic time, suggesting that the sulfide film formed on the surface can not effectively prevent SPV50Q steel for avoiding the further corrosion.

• Periodical: Advanced Materials Research (Volumes 314-316)
• Pages: 1087-1091
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.314-316.1087
• Online since: August 2011
• Authors: Fan Yu Kong, Guo Jian Hu, Xu Li
• Keywords: SPV50Q Steel, Stress Corrosion Cracking (SCC), Wet H2S

References

[1] JONES D A. Principles and prevention of corrosion[M]. New York: Macmillan Publishing Company, 1996.

[2] FONTANA M G, STAEHL R W. Advances in corrosion science and technology[M]. New York: Plenum Press, 1990.

[3] Li Zuyi. Under wet hydrogen sulfide environment refining equipment corrosion and protection[J]. Corrosion & Protection in Petrochemical Industry, 2001, 18 (3): 1-5(in Chinese)

[4] LIE Xueyu, TIAN Qingcun. Corrosion of Refinery Equipment in Wet Hydrogen Sulfide Environment and Protection [J]. Petro-Chemical Equipment Technology， 2002, 23(3): 48-52(in Chinese)

[5] National Association of Corrosion Engineers. Standard materials requirements-sulfide stress cracking resistance metallic materials for oilfield equipment[S]. Houston: National Association of Corrosion Engineers, 1996.

[6] GONG Jianming, JIANG Wenchun, TANG Jianqun, CHEN Hu, TU Shandong. 3D Finite Element simulation of hydrogen diffusion in 16mnr steel weldment[J]. Chinese Journal of Mechanical Engineering,2007 (9):117-122

DOI: 10.3901/jme.2007.09.113

[7] BUCHHEIM G M. Ways to deal with wet H2S cracking revealed by study. Oil Gas J, 1990, 88(28): 892-896

[8] TSAY L W, LEE W C, LUU W C, et al. Effect of hydrogen environment on the notched tensile properties of T-250 managing steel annealed by laser treatment[J]. Corrosion Science, 2002, 44: 1311-1327.

DOI: 10.1016/s0010-938x(01)00137-8