ANÁLISE DE FALHA DE UM COMPONENTE ESTRUTURAL DE PLANTA DE PELOTIZAÇÃO DE MINÉRIO DE FERRO

Grate bars of pallet cars employed in iron ore pelletizing process presented severe abrasive wear due to the contact with the pellets, and erosive wear as a consequence of the hot air flow containing iron ore particles. Burning fossil fuels and the presence of contaminants in the pellets resulted in...

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Bibliographic Details
Published in:Tecnologia em metalurgia, materiais e mineração materiais e mineração, 2008-07, Vol.5 (1), p.51
Main Authors: Milan, Marcelo Tadeu, Maluf, Omar, Tapani, José Ricardo, Ferraz, Claudio Finamore, Moutinho, Jael, Freitas, Tenório
Format: Article
Language:Portuguese
Subjects:
Abrasive erosion
Abrasive wear
Air flow
Alkali metals
Aluminum
Automobiles
Bars
Combustion
Contaminants
Corrosion fatigue
Degradation
Depletion
Deposits
Eutectic temperature
Fossil fuels
Fuels
Hot corrosion
Iron compounds
Melting
Oxidation
Pellets
Spalling
Steel industry
Structural steels
Thermal fatigue
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Summary:Grate bars of pallet cars employed in iron ore pelletizing process presented severe abrasive wear due to the contact with the pellets, and erosive wear as a consequence of the hot air flow containing iron ore particles. Burning fossil fuels and the presence of contaminants in the pellets resulted in low melting point eutectics of metal alkali salts. Liquid salt deposits on the grate bar surface dissolved the protective oxide layer, inducing hot corrosion degradation of the component. Thermal fatigue induced-spalling further aggravated the problem. It was recommended a higher Cr-content stainless steel in order to supply the near surface Cr-depleted zone as well as higher levels of Si and Al aimed at increasing global oxidation resistance.
ISSN:2176-1515
2176-1523
DOI:10.4322/tmm.00501010