1Laboratoire De Valorisation et Promotion des Ressources Sahariennes, Universite Kasdi Merbah, Ouargla- 30000, Algerie.
2Faculte Des Hydrocarbures, Energies Renouvelabels, Science De La Terre et De l’univers, Universite Kasdi Merbah, Ouargla - 30000, Algerie.
3Structures, Properties and Inter Atomic Interactions Laboratory (LASPI2A), Faculty of Science and Technology, Unversity of Abbes Laghrour, Khenchela- 40000, Algeria.
4Faculte Des Sciences Exactes, Universite Mohamed Khider, Biskra-07000, Algerie.
5Faculte Des Sciences Exactes, Universite Echahid Hamma Lakhdar, Eloued- 39000, Algerie.
*Corresponding Author E-mail:fchelgham@gmail.com
Recently, Pipeline corrosion is a major problem facing many oil and gas industries today because of the enormous downtime associated with corrosion related failures. In this study, the effect of tempering temperature (250, 300 and 550°C) on the corrosion behavior of American Petroleum Institute (API) N80 steel in albian water at different gradient temperatures were investigated using X-ray diffraction (XRD), the electrochemical measurements combined with hardness test. XRD patterns have shown that the API N80 steel samples crystallize in ferrite type structure with a strong (110) orientation. We remarked that all samples the N80 are a nanometric grain size, the values of grain sizes given in the range from 211 to 485 A. Corrosion rates of samples are correlated with structural changes (grain size, strain) in samples with increasing tempering temperature. Steel N80 with higher tempering temperature exhibited excellent corrosion resistance with lower corrosion current density. The distinction of corrosion resistance can be attributed to increased grain sizes and decreased residual stress and hardness.
API N80, Residual stresses, Tempering temperature, Corrosion, Hardness
