doi: 10.14773/CST.2020.19.6.296 BibTeX RIS Mendeley


지역난방 냉각수 배관의 용접부 파손 분석

Failure Analysis of Welded type 304 in Cooling Water Pipeline of District Heating System

  • 정준철(아주대학교) ,
  • 김우철(한국지역난방공사) ,
  • 김경민(한국지역난방공사) ,
  • 손홍균(한국부식방식학회) ,
  • 김정구(성균관대학교) ,
  • 이수열(충남대학교) ,
  • 김희산(홍익대학교) ,

초록

-

Failure analysis on the welded type 304 pipe used for cooling water piping in the district heating primary side was conducted. Inorganic elements and bacteria in the cooling water and in corrosion products were analyzed, and the weldment was inspected by microscopy and a sensitization test. Corrosion damages were observed in the heat-affected zone, on weld defects such as incomplete fusion or excessive penetration caused by improper welding, or/and at the 6 o'clock position along the pipe axial direction. However, the level of concentration of chloride in the cooling water as low as 80 ppm has been reported to be not enough for even a sensitized type 304 steel, meaning that the additional corrosive factor was required for these corrosion damages. The factor leading to these corrosion damages was drawn to be the metabolisms of the types of bacteria, which is proved by the detection of proton, sulfur containing species, biofilms, and both bacteria and corrosion product analyses.


키워드

HAZ, Sensitization, District heating, Bacteria, Cooling water pipeline


발행 정보

서지정보
Corrosion Science and TechnologyCorrosion Science and Technology / v.19, no.6, 2020년, pp.296-301
발행기관
한국부식방식학회
저널 DOI
doi: 10.14773
pISSN
1598-6462
eISSN
2288-6524
발행일
2020.12.31
언어
영어

첨부파일

1 CST 19-6-3 Failure Analysis of Welded type 304.pdf

이력 정보

2020.12.31 발행
2021.01.06 DOI발급

위치 정보


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