Artigo sobre ferro vermicular( pode se

62º Congresso Anual da ABM / 62nd ABM International Annual Congress

TUBOS CENTRIFUGADOS DE FERRO FUNDIDO
VERMICULAR: CARACTERÍSTICAS E PRODUÇÃO 1

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Ivaldo Assis do Nascimento
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Assis Moura Nascimento
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André Luis de Brito Baptista

CENTRIFUGUED VERMICULAR CAST IRON PIPES: CHARACTERISTICS AND
PRODUCTION
Abstracts
Mechanical properties of cast irons – resistance to traction, ductility and modulus of elasticity
– depend on the structure and distribution of microstructures. In certain cast irons, graphite is the microstructure that has the most effect on properties. The shape and distribution of graphite are used more than the technical composition in the classification of cast irons. Irons of a given composition can be made in three basic types (grey, nodular, vermicular) just by varying forging practices. The microstructure of the matrix that surrounds the graphite also influences mechanical properties. The structure of vermicular irons can be take as being intermediary, however, through combining certain characteristics it can be turned into a better structure than the grey and nodular ones. Practices and processes of forging used in producing grey and nodular types can be used to make vermicular cast iron parts by making small changes. Forging with the use of centrifugation basically consists of emptying molten metal into a cylindrical mold spinning at a high speed. This technique is directly applied in the production of pipes that transport fluids and gases. Vermicular iron is used to make pipelines because it optimizes low production costs, has high corrosion resistance and good mechanical properties. This work reviews literature referring to when cast iron pipes emerged, the particularities and characteristics of this type of iron, as well as describing the production method used.
Key works: Pipe; Centrifuging; Cast iron
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Contribuição técnica ao 62° Congresso Anual da ABM – Internacional, 23 a 27 de julho de 2007,
Vitória – ES, Brasil.
Engenheiro