MnS precipitation in association with manganese silicate inclusions in Si/Mn deoxidized steel

  • Han S. Kim
  • Hae-Geon Lee
  • Kyung-Shik Oh
Article

Abstract

When manganese silicate inclusions were formed during cooling from 1600 °C, manganese and sulfur contents in the manganese silicate inclusions were much lower than their equilibrium values within the steel matrix, i.e., the steel matrix was supersaturated with Mn and S against the inclusions. The formation of a Mn-depleted zone around an inclusion and the precipitation of a MnS phase on the inclusion were greatly affected by the thermal history of the steel. Slow cooling helped the formation of both the Mn-depleted zone and the MnS phase on the inclusion, but fast cooling suppressed it. Subsequent isothermal holding at 1200 °C diminished the existing Mn-depleted zone in slow-cooled steel, but created a Mn-depleted zone for fast-cooled steel. The mass transfer within an inclusion was sluggish, and the formation of a MnS phase is due to the local saturation of Mn and S at the outer part of an inclusion. It was suggested that the major factors affecting the formation of the Mn-depleted zone and the MnS phase are the cooling rate, isothermal holding, and the sulfide capacity of the inclusion.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2001

Authors and Affiliations

  • Han S. Kim
    • 1
  • Hae-Geon Lee
    • 1
  • Kyung-Shik Oh
    • 2
  1. 1.the Department of Materials Science and Metallurgical EngineeringPohang University of Science and Technology (POSTECH)PohangKorea
  2. 2.the Technical Research LaboratoriesPohang Iron & Steel Co. Ltd.PohangKorea

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