STP1361: Sulfur Content of Carbon Steel Plate Material for Dished End Manufacture by Cold Spinning

    Dutta, T
    Senior Manager QA, Associate Manager QA, Divisional Manager QAC, Thermax Limited, Pune,

    Chandawale, RG
    Senior Manager QA, Associate Manager QA, Divisional Manager QAC, Thermax Limited, Pune,

    Vanchinath, SA
    Senior Manager QA, Associate Manager QA, Divisional Manager QAC, Thermax Limited, Pune,

    Pages: 5    Published: Jan 1999


    Abstract

    Over many years SA 516 Gr. 70 plate material is being used for the construction of boilers and pressure vessels and has become a standard of the industry. However a typical failure of this material during dished end manufacture has troubled the manufacturer on and off. Many times lamellar separation takes place along the central line of the thickness visible at the edges of the dished ends after cold spinning.

    In this present study we have carried out a customized shear test to ascertain the effect of sulfur content on the susceptibility of the SA 516 Gr. 70 plate material to fail by shear along the plane of segregation.

    This study indicated that the presence of central segregation is a critical factor to induce reduction in the shear strength. As the sulfur content goes down the segregation line disappears and the shear strength also increases. At 0.01% maximum sulfur best results are obtained. It was supported by the field observation of failed dished ends, where failures are observed with plates with typical sulfur content of 0.02% and above.

    Keywords:

    cold spinning, lamellar separation, segregation, shear strength


    Paper ID: STP12376S

    Committee/Subcommittee: A01.11

    DOI: 10.1520/STP12376S


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