한국가스학회지 (Journal of the Korean Institute of Gas)

  • 제24권5호
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  • Pages.39-46
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  • 2020
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  • 1226-8402(pISSN)
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  • 2713-6922(eISSN)
한국가스학회 (The Korean Institute of GAS)
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배관 강재 API 5L X65의 중심편석

Centerline Segregation of Pipe Plate made of API 5L X65 Steel

  • 투고 : 2020.06.23
  • 심사 : 2020.10.08
  • 발행 : 2020.10.31
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초록

본 논문에서는 파이프라인에서 사용되는 API 5L 철강의 중심선 편석에 대해 다루고자 한다. Mn/S와 Nb 그리고 C는 파이프 두께 방향으로의 중심선에서 편석되는 요소로 알려져 있다. Mn은 일반적으로 긴 점성상을 이루는 S를 동반한다. 중심선의 미세조직은 MnS와 산소를 포함한 Nb/Ti로 구성되어 있는데 이 중심선 지역의 편석효과를 OM, SEM/EDS 및 마이크로비커스 경도기로 분석하였다. Mn, Nb 및 C는 오스테나이트가 페라이트 또는 마르텐사이트로 변태하는 것을 억제시키는 원소이다. 이러한 원소들은 마르텐사이트의 한 종류인 베이나이트 미세조직을 만들 수 있는데 이는 용융 및 열처리에서 얻어지는 중심선과 매트릭스 간의 원소 편석과는 다르다.

This paper is considered about centerline segregation of API 5L steel used in pipeline. Mn/S, Nb and C were known as segregated elements in the centerline of pipe thickness. The Mn usually was accompanied by S consisting of long viscous shape. Microstructure of the centerline was composed of MnS and Nb/Ti indusions including oxide. The segregation effect in centerline region was analyzed by OM, SEM/EDS and micro Vickers hardness. The Mn, Nb and C are retarded elements in transformation from austenite to ferrite or martensite. These elements could derive a bainitic microstructure as a kind of martensite, which is different from difference and element segregation between in matrix and centerline derived from steel melting and heat treatment.

키워드

참고문헌

  1. Godefroid, L.B., Sena, B.M., Da Trindade Filho, V.B., "Evaluation of Microstructure and Mechanical Properties of Seamless Steel Pipes API 5L Type Obtained by Different Processes of Heat Treatment", Mat. Res., 20(2), (2017)
  2. Godefroid, L.B., Candido, L.C., Toffolo, R.V.B., Barbosa, L.H.S., "Microstructure and meshanical properties of two Api steels for iron ore pipelines", Mat. Res., 17, 114-120, (2014) https://doi.org/10.1590/S1516-14392014005000068
  3. Liu, Y., Zhang, L., Duan, H., Zhang, Y., Luo, Y., Conejo, A.N., "Thermodynamic Analysis, and Precipitation Mechanism of MnS-TiN Complex Inclusions in Low-Sulfur Steels, Metallurgical and Materials Transactions A, 47, 3015-3025, (2016) https://doi.org/10.1007/s11661-016-3463-1
  4. Muschenborn, W., Meyer, L., Thyssen Technische Berichte, 1, 22, (1974)
  5. Pichler, A., Hebesberger, Th., Traint, S., Tragl, E., Kurz, T., Krempaszky, C., Tsipouridis, P., Werner, E., "The role of Niobium in Advanced Sheet Steels for Automotive Application", Proc. Of the Int. Symp. On Nb Microalloyed Sheet Steel for Automotive Appl. TMS, 245, (2006)
  6. Hulka, K., Klinkenberg, C., Mohrbacher, H., Recent advances of Niobium Containing Materials in Europe: Proceedings of the Symposium Helt at the Occasion of the 30 Years Anniversary of Niobium Products Company GmbH in Dusseldorf, ed. Hulka, K., Stahlesen, (2005)
  7. Collins, L.E., Barager, D.L. Interstitial Free Steel Sheet: Processing, Fabrication and Properties, Iron & Steel Society, (1991)
  8. Zackay, V.F., Parker, E.R., Fahr, D., Busch, R., ASM Transactions Quarterly, American Society for metals, (1969)
  9. Hashimoto, S., Materials Science Forum Vols. 539-543, 4411-4416, (2007)
  10. Ghosh, A., "Segregation in cast products", Sadhana, 26, 5-24, (2001) https://doi.org/10.1007/BF02728476
  11. El-Bealy, M.O., "Macrosegregation Quality Criteria and Mechanical Soft Reduction for Central Quality Problems in Continuous Casting of Steel", Materials Sciences and Applications, 5, 724-744, (2014) https://doi.org/10.4236/msa.2014.510074
  12. El-Bealy, M.O., "Spray cooling pattern and microthermomechanical rigidity criterion for improving inner quality in continuously cast steel slabs", Ironmaking & Steel making, 40, 167-188, (2013) https://doi.org/10.1179/1743281211Y.0000000070
  13. Constantino Capurro, Carlos Cicutti, "Analysis of titanium nitrides precipitated during medium carbon steels solidification", Journal of Materials Research and Technology, 7, 342-349 (2018) https://doi.org/10.1016/j.jmrt.2018.04.010
  14. Hardy Mohrbacher, "The Effects of Niobium Microalloying in Second Generation Advanced High Strenth Steel", Taiwan 2008 International Steel Technologies Symposium (2008)
  15. Woo Sik Kim, Jae Il Jang, "The Effect of Hydrogen on Mechanical Properties of Gas Pipeline Material: I Tensile property", KIGAS, 15(3), 67-73, (2011)