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Controlling Variability in Mechanical Properties of Plates by Reducing Centerline Segregation to Meet Strain-Based Design of Pipeline Steel

1
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2
Department of Metallurgical and Materials Engineering, University of Texas EI Paso, EI Paso, TX 799968, USA
3
State Key Laboratory of Metal Materials for Marine Equipment and Applications, Anshan 114021, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(7), 749; https://doi.org/10.3390/met9070749
Received: 14 June 2019 / Revised: 2 July 2019 / Accepted: 2 July 2019 / Published: 4 July 2019
(This article belongs to the Special Issue High-Strength Low-Alloy Steels)
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Abstract

Low variability in mechanical properties is required for pipeline project designs to meet a strain-based design, which is used in regions of large ground movements. The objective of this study is to elucidate the influence of centerline segregation in continuously cast slab on variability in the mechanical property of pipeline steel, and controlling centerline segregation can meet the requirements of a strain-based design. Mannesmann rating method was used to evaluate the degree of segregation of two slabs and its effect on variability in mechanical properties of corresponding plates. Microstructural characterization indicated that bainite/martensite was formed in a segregated area where the content of C and Mn enriched. The mechanical property results indicated that controlling the degree of centerline segregation can reduce tensile strength variability and improve ductile-brittle transition temperature (DBTT). View Full-Text
Keywords: centerline segregation; segregation rating; pipeline steel; mechanical property variability; strain-based design centerline segregation; segregation rating; pipeline steel; mechanical property variability; strain-based design
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Guo, F.; Liu, W.; Wang, X.; Misra, R.; Shang, C. Controlling Variability in Mechanical Properties of Plates by Reducing Centerline Segregation to Meet Strain-Based Design of Pipeline Steel. Metals 2019, 9, 749.

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