Proceedings of the Korea Committee for Ocean Resources and Engineering Conference (한국해양공학회:학술대회논문집)

Korean Society of Ocean Engineers (한국해양공학회)
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A Study on Stress Corrosion Behaviors in Welded Zone of the API 5L-X65 Steel for Natural Gas Transmission

천연가스 수송용 API 5L-X65강 용접부의 부식거동에 관한 연구

  • JO SANG-KEUN (Dept. of Mechanical Engineering, Graduate School Pukyong National University) ;
  • SONG HAN-SEOP (Seobusan Technical High School) ;
  • KONG YOO-SIK (School of Mechanical Engineering, Pukyong National University) ;
  • KIM YUONG-DAI (School of Mechanical Engineering, Pukyong National University)
  • 조상근 (부경대학교 대학원 기계공학과) ;
  • 송한섭 (서부산공업고등학교) ;
  • 공유식 (부경대학교 기계공학부) ;
  • 김영대 (부경대학교 기계공학부)
  • Published : 2004.05.01
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Abstract

This study is on the constant-current stress corrosion test related to the load stress in welded zone and non-welded zone of high tensile strength steel for natural gas transmission. The surface corrosion pattern of the welded zone of API 5L-X65 specimens for natural gas transmission showed global corrosion and narrow pitting, and the pitting was increased by increasing the load stress. Initially, the average relative electrode potential and the average relative current of the high tensile strength steel for natural gas transmission specimens was decreased suddenly, and the average relative electrode potential was higher and the average relative current was lower in welded zone than base metal. and the average relative electrode potential was decreased by increasing the load stress, and the average relative current was somewhat increased by increasing the load stress. The corrosion rate was less in welded zone than base metal, and the corrosion rate was decreased by increasing the load stress.

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