Relationship between Microstructure, Corrosion, and Mechanical Degradation in P110 and N80 Drill Steels

Oualid  Dairi; Mohamed Hamidouche; Mohamed Ilyes Habia; Zahra  Malou Hamidouche; Tarek Bali; Mohamed  Liamine Bella; Akram  Zegadi

doi:10.3989/revmetalm.e291.1753

Authors

Oualid Dairi Emerging Materials Research Unit, University Setif 1 https://orcid.org/0009-0001-9699-7372
Mohamed Hamidouche Emerging Materials Research Unit, University Setif 1 https://orcid.org/0000-0001-7928-4568
Mohamed Ilyes Habia Applied Optics Laboratory, Faculty of science, Mohamed Boudiaf University of Msila https://orcid.org/0000-0001-7787-9672
Zahra Malou Hamidouche Emerging Materials Research Unit, University Setif 1 https://orcid.org/0000-0002-5873-4096
Tarek Bali Emerging Materials Research Unit, University Setif 1 https://orcid.org/0009-0003-5113-6952
Mohamed Liamine Bella Emerging Materials Research Unit, University Setif 1 https://orcid.org/0000-0003-3044-6970
Akram Zegadi Emerging Materials Research Unit, University Setif 1 https://orcid.org/0009-0002-5405-1762

DOI:

https://doi.org/10.3989/revmetalm.e291.1753

Keywords:

Carbon steel, Corrosion, Hardness, Mechanical properties, N80 steel grade, P110 steel grade

Abstract

This study provides a comprehensive examination of how corrosion impacts the structure-property relationships of P110 and N80 carbon steels, which are widely utilized for tubing and casing in the oil and gas industry. A multi-technique approach was employed, including optical microscopy, X-ray fluorescence, Vickers hardness testing, and confocal microscopy, to analyze samples in both their as-received and corroded states. The results reveal that corrosion significantly degrades the microstructure and mechanical properties of both steels. P110 steel, characterized by a tempered martensite microstructure and higher initial strength, exhibits severe localized pitting corrosion and a substantial increase in surface roughness. In contrast, N80 steel shows more uniform and diffuse degradation with significant surface oxide growth. Corrosion induces a notable reduction in hardness and a non-linear evolution of deformation under load, highlighting the complex interplay between microstructure and environmental degradation. The innovative contribution of this work lies in the development of a predictive framework that links these experimental observations to material service life. This framework provides a valuable tool for the oil and gas industry, enabling a shift from reactive maintenance to proactive asset management, thereby enhancing operational safety and economic efficiency.

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