Of Some Mechanical Characteristics for a Steel Used in Constructions of Conduits for Steam Transfer

  • Dumitru MIHAI "Gheorghe Asachi" Technical University of Iasi, Romania
  • Silviu MACUTA "Dunarea de Jos" University of Galati, Romania
Keywords: low alloy steel, metallurgical degradation, irreversible structural phenomena

Abstract

The metallographic analysis [4], revealed that the initial ferrite-pearlite structure of the steel under study shows slight tendencies for coalescence, decarburation and carbide precipitation. The precipitating carbides maintained their globular shape being located on the grain boundaries. Due to the metallurgical degradation, the mechanical degradation occurs as a consequence of both cavities and microcracks formation processes. Based on the values determined for the mechanical characteristics of the pipe under study it has been concluded that the material is suitable for continuing the service and has marked resistance reserves. These reserves have been explained by the absence of the marked processes of grain boundary decarburation and the carbide network formation.

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References

[1]. Mihai, D. - The metallurgical degradation of the 12H1MF steel, to be pulished in Bul.Inst.Polit. Iasi, t. XLVI (L), 2000.
[2]. Chesa, I., Lascu, N. et al. – Steel grades and products (in Romanian), Editura Tehnica, Bucuresti, 1989.
[3]. Ailincai, G. et al. – Studies on the structural transformation stage of the steam piping materials of the kettles from thermal power stations (in Romanian), Research contract no. 21316-74. Beneficiary: CIPEET Bucuresti.
[4]. Ailincai, G. and Mihai, D. – Studies on the structural transformation stage of the steam piping materials of the kettles from thermal power stations (in Romanian), Research contract no. 264-85. Beneficiary: ICEMENERG Bucuresti.
Published
2011-03-15
How to Cite
1.
MIHAI D, MACUTA S. Of Some Mechanical Characteristics for a Steel Used in Constructions of Conduits for Steam Transfer. The Annals of “Dunarea de Jos” University of Galati. Fascicle IX, Metallurgy and Materials Science [Internet]. 15Mar.2011 [cited 27Nov.2024];34(1):47-0. Available from: https://gup.ugal.ro/ugaljournals/index.php/mms/article/view/2966
Section
Articles

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