Corrosion Science and Technology

  • 제4권6호
  • /
  • Pages.236-241
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  • 2005
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  • 1598-6462(pISSN)
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  • 2288-6524(eISSN)
한국부식방식학회 (The Corrosion Science Society of Korea)
권호 표지

Effect of $H_2S$ Partial Pressure and pH of Test Solution on Hydrogen Induced Cracking of High Strength Low Alloy Steels

  • Kim, Wan Keun (Pohang University of Science and Technology Department of Materials Science and Engineering) ;
  • Koh, Seong Ung (Pohang University of Science and Technology Department of Materials Science and Engineering) ;
  • Kim, Kyoo Young (Pohang University of Science and Technology Department of Materials Science and Engineering) ;
  • Yang, Boo Young (Technical Research Center, Pohang Iron & Steel Co., Ltd.) ;
  • Jung, Hwan Kyo (Technical Research Center, Pohang Iron & Steel Co., Ltd.)
  • 발행 : 2005.12.01
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초록

Hydrogen induced cracking (HIC) is one of the hydrogen degradation phenomena of linepipe steels caused by $H_2S$ gas in the crude oil or natural gas. However, NACE TM0284-96 standard HIC test method is hard to satisfy the steel requirements for sour service application since it uses more severe environmental conditions than actual conditions. Therefore, in order to use steels effectively, it is required to evaluate HIC resistance of steels in the practical range of environmental severity. In this study, HIC resistance of two high strength low alloy (HSLA) steels being used as line pipe steels was evaluated in various test solutions with different $H_2S$ pressures and pH values. The results showed that the key parameter affecting crack area ratio (CAR) is $H_2S$ partial pressure of test solution when the pH value of test solution is not over 4. Hydrogen diffusivity was not a constant value, but it was rather affected by the hydrogen ion concentration (pH value) in the solution.

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