Microstructure and mechanical properties of two API steels for iron ore pipelines.
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Data
2014
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Resumo
This research compares the mechanical behavior of two API steels (X60 and X70) used in the
longest pipeline in the world for the conveyance of iron ore. Tensile tests, Charpy impact tests, CTOD
tests and fatigue crack growth tests are performed at ambient temperature. Metallographic examination
showed a banded microstructure consisting of polygonal ferrite and pearlite in both steels, with smaller
grain size and the presence of a small quantity of bainite in the X70 steel. All the mechanical tests
revealed a ductile behavior for the two steels. The X70 steel is preferable for the pipeline project, due
its better mechanical resistance, with no significant loss of fracture toughness and fatigue resistance.
Its performance could be even better, if an appropriate combination of thermomechanical processing
parameters were able to produce a microstructure with minor amount of pearlite, where acicular
ferrite/bainite are present.
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API steels, Fracture toughness, Fatigue crack growth
Citação
CODEFROID, L. B. et al. Microstructure and mechanical properties of two API steels for iron ore pipelines. Materials Research, São Carlos, v. 17, p. 114-120, 2014. Disponível em: <http://www.scielo.br/pdf/mr/2014nahead/aop_matres_223713.pdf>. Acesso em: 09 abr. 2015.