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    Volume 6, Issue 3 (May 2017)

    Special Issue Paper

    Anisotropic Nature of Raw, Radially Strained, and Radially Strained and Aged Steel Tubes

    (Received 31 March 2016; accepted 4 October 2016)

    Published Online: 26 May 2017

    CODEN: MPCACD

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    Abstract

    Because of the difficulty of measuring anisotropy in steel tubes, industries often rate overall tube strength based on tensile properties of the raw steel, or of the steel in a single direction (along the axis of the tube). This paper discusses the use of mini-tensile testing to develop a much more accurate way of assessing the anisotropic strength of these steel tubes, which is typically unobtainable through conventional tensile testing. In this study, the amount of anisotropy is determined within the tube by measuring the yield strength of the steel in three conditions (raw, strained, and strained and aged), three orientations (radial, transverse (hoop), axial (longitudinal), and locations (inner diameter, neutral axis, and outer diameter) within the tube. The data shows that the strength is approximately 10 % greater for the strained and strained and aged steels in the transverse direction than in the axial direction because of work hardening during the upsetting process. Microstructural examination using optical microscopy and scanning electron microscopy was used to explain the mini-tensile test results and to support the observation that the steel tubes are more likely to fail in axial tension than in burst (internal pressure radially outward) and collapse (external pressure radially inward).


    Author Information:

    Strickland, J. N.
    Dept. of Materials Science and Engineering, Univ. of North Texas, Denton, TX

    Ohl, B.
    Dept. of Materials Science and Engineering, Univ. of North Texas, Denton, TX

    Chitwood, G.
    Halliburton Co.,

    Krishnan, K.
    Halliburton Co.,

    Kohn, G.
    Halliburton Co.,

    Young, M. L.
    Dept. of Materials Science and Engineering, Univ. of North Texas, Denton, TX


    Stock #: MPC20160039

    ISSN:2165-3992

    DOI: 10.1520/MPC20160039

    Author
    Title Anisotropic Nature of Raw, Radially Strained, and Radially Strained and Aged Steel Tubes
    Symposium ,
    Committee E04