Effect of Low-Temperature Environment on Stress Corrosion Cracking Behavior of X80 Pipeline Steel in Simulated Alkaline
- PDF / 5,059,014 Bytes
- 11 Pages / 593.972 x 792 pts Page_size
- 18 Downloads / 229 Views
RODUCTION
X80 high-strength steel has become the first-choice material for China’s oil and gas pipeline transportation.[1] With the increasing application of X80 pipeline steel, numerous scholars have studied the anticorrosion of X80 pipeline steel.[2–7] Stress corrosion cracking (SCC) is a kind failure of mode under stress and corrosive medium. This mode occurs suddenly without any sign and exerts a considerably destructive effect.[7–10] Thus, remarkable achievements are presented in the study of SCC of X80 pipeline steel.[11–16] The SCC behavior of X80 steel in simulated soil solution is complex, and many influencing factors exist. Among these factors, environmental temperature is closely related with SCC occurrence. The sensitivity of SCC is
FEI XIE, DAN WANG, MING WU, CHENGXIANG YU, XU YANG, and CHANGHAO XU are with the Key Laboratory of Oil & Gas Storage and Transportation, College of Petroleum Engineering, Liaoning Shihua University, No. 1, Dandong Road, Wanghua, Fushun, Liaoning, China. Contact e-mail: [email protected] DONGXU SUN is with the Key Laboratory of Oil & Gas Storage and Transportation, College of Petroleum Engineering, Liaoning Shihua University and also with the College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, 266555, Shandong, China. Manuscript submitted February 22, 2017. Article published online January 29, 2018 1372—VOLUME 49A, APRIL 2018
affected by the oxygen content in soil, diffused process of oxygen, corrosive morphology and products.[17,18] Paul et al.[19] considered that the pitting corrosion of APIX80 steel in 3.5 pct NaCl solution occurs at low temperature in solution. Qi et al.[20] observed that corrosion rate reaches the maximum in hydrogen sulfide environment at 313 K (40 °C) and decreases with increasing temperature. Ye et al.[21] suggested that stress corrosion sensitivity is not obvious at room temperature under dissolved oxygen environment of the X70 pipeline steel; when the temperature increases to 333 K (60 °C), the SCC sensitivity also increases and leans towards stress corrosion. For its fracture mechanism, Guo et al.[22] proposed that cracking in X70 pipeline steel in near-neutral solution at different temperatures is transgranular type and presents quasicleavage. Zhang et al.[23] considered that temperature increase accelerates the corrosion crack extension of the aluminum alloy and that the fracture is mainly an intergranular one. Their research mainly focused on SCC behavior at temperatures not lower than 313 K (40 °C). However, neither a systematic research nor a reliable theoretical basis has been presented regarding the effect of low temperature 273 K to 313 K (0 °C to 10 °C) on the SCC and the mechanism of pipeline fracture. Therefore, the stress corrosion behavior and mechanism of X80 pipeline steel in simulated alkaline soil solution at low-temperature environments should be systemically investigated.
METALLURGICAL AND MATERIALS TRANSACTIONS A
The Liaohe oilfield is located in Panjin, China, and its annual average temperature is appro
Data Loading...
