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http://dx.doi.org/10.7842/kigas.2020.24.5.39

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

Choe, Byung Hak (Dept. of Metal and Materials Engineering, Gangneung-wonju National University)
Lee, Sang Woo (Dept. of Metal and Materials Engineering, Gangneung-wonju National University)
Kim, Woo Sik (KOGAS)
Kim, Cheol Man (KOGAS)
Publication Information
Journal of the Korean Institute of Gas / v.24, no.5, 2020 , pp. 39-46 More about this Journal
Abstract
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.
Keywords
centerline segregation; pipe plate; Nb-Mn-C element; bainitic structure;
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