Ref.: MmeCo14-017

Sour Corrosion of API 5L X70 Carbon Steels in NACE TM0177B solution

Apresentador: Élida Alves

Autores (Instituição): Alves, �.(UNESP); Fernandes, G.C.(UNESP); Soares, P.A.(FATEC- Guaratinguetá); Lucas, R.R.(UNESP); Ribeiro, R.B.(Centro Universitário Teresa D'Ávila); Pinheiro, P.M.(Unesp); Ribeiro, S.M.(Unesp); Acciari, H.A.(Unesp - Faculdade de Engenharia de Guaratinguetá); Codaro, E.N.(UNESP); Barbedo, E.L.(Unifei);

Resumo:
Corrosion of pipelines by hydrogen sulfide is the most worrying factor in the production and transportation of oil and gas. In this work, the microstructural characteristics and corrosion behavior of API 5L X70MS and X70MO low carbon steels in hydrogen sulfide environments were investigated. Immersion tests were performed in accordance with NACE TM0177. After testing, both steels showed general corrosion. Cracks were observed only in X70MO steel, probably due to its lower grain refinement and banded microstructure. Internal cracks seem to be initiated in elongated MnS inclusions.