열처리공학회지 (Journal of the Korean Society for Heat Treatment)

  • 제35권4호
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  • Pages.185-192
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  • 2022
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  • 1225-1070(pISSN)
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  • 2508-4046(eISSN)
한국열처리공학회 (The Korean Society for Heat Treatment)
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ERW 용접 전후 API X70 라인파이프강의 미세조직과 기계적 특성 변화

Effect of Electrical Resistance Welding on Microstructure and Mechanical Properties of API X70 Linepipe Steel

  • 오동규 (서울과학기술대학교, 신소재공학과) ;
  • 최예원 (서울과학기술대학교, 신소재공학과) ;
  • 신승혁 (서울과학기술대학교, 신소재공학과) ;
  • 정한길 (현대제철 강관생산기술팀) ;
  • 곽진섭 (현대제철 강관생산기술팀) ;
  • 황병철 (서울과학기술대학교, 신소재공학과)
  • Oh, Dong-Kyu (Department of Materials Science and Engineering, Seoul National University and Technology (SEOULTECH)) ;
  • Choi, Ye-Won (Department of Materials Science and Engineering, Seoul National University and Technology (SEOULTECH)) ;
  • Shin, Seung-Hyeok (Department of Materials Science and Engineering, Seoul National University and Technology (SEOULTECH)) ;
  • Jeong, Han-Gil (Hyundai steel Company) ;
  • Kwack, Jin-Sub (Hyundai steel Company) ;
  • Hwang, Byoungchul (Department of Materials Science and Engineering, Seoul National University and Technology (SEOULTECH))
  • 투고 : 2022.07.01
  • 심사 : 2022.07.28
  • 발행 : 2022.07.30
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초록

Variations in the microstructure and mechanical properties of API X70 steel processed by piping, electrical resistance welding (ERW), and post seam annealing (PSA) are investigated in this study. In the welding zone, some elongated pearlites are formed and grains coarsening occurs due to extra heat caused by the ERW and PSA processes. After the piping, the base metal shows continuous yielding behavior and a decrease in yield and impact strengths because mobile dislocation and back stress are introduced during the piping process. On the other hand, the ERW and PSA processes additionally decreased the impact strength of welding zone at room and low temperatures because some elongated pearlites easily act as crack initiation site and coarse ferrite grains facilitate crack propagation. As a result, the fracture surface of the welding zone specimen tested at low temperature revealed mostly cleavage fracture unlike the base metal specimen.

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과제정보

The present study was supported by the Basic Science Research Program through the National Research Foundation of Korea, South Korea (NRF-2017R1A2B2009336) and by the Technology Innovation Program through the Ministry of Trade, Industry and Energy (MOTIE), South Korea (Grant No. 20016064)

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