Impact Characterization of Line Pipe Steels by Means of Standard, Sub-Size and Miniaturized Charpy Specimens

Published

February 10, 2015

Author(s)

Enrico Lucon, Christopher N. McCowan, Raymond L. Santoyo

Abstract

Modern line pipe steels are characterized by a continuously increasing ratio between ductility and mechanical strength, which makes it difficult to interpret the results of conventional Charpy impact tests. For such tests, the extremely high absorbed energy can be associated mostly to bending of the sample and friction between specimen and anvils. In this investigation, we performed instrumented Charpy tests in order to characterize the impact properties of four line pipe steels. For each of the steels, tests were performed on standard E23 Charpy specimens, sub-size specimens of two types (⅔-size and ¿-size), and miniaturized specimens of two types (KLST and RHS). For every combination of steel and specimen type, full transition curves and corresponding transition temperatures were established for absorbed energy, lateral expansion and shear fracture appearance.

Citation

Technical Note (NIST TN) - 1865

Report Number

1865

NIST Pub Series

Technical Note (NIST TN)

Pub Type

NIST Pubs

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DOI Link

Keywords

Line pipe steels, instrumented Charpy tests, sub-size Charpy specimens, miniaturized Charpy specimens, ductile-to-brittle transition temperature, upper shelf energy, size-normalization, shear fracture appearance.

Citation

Lucon, E. , McCowan, C. and Santoyo, R. (2015), Impact Characterization of Line Pipe Steels by Means of Standard, Sub-Size and Miniaturized Charpy Specimens, Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.TN.1865 (Accessed December 14, 2024)