scope:

Introduction

Definition of CRA - A corrosion-resistant alloy (CRA) is defined as an alloy whose mass-loss corrosion rate in produced fluids is at least an order of magnitude less than that of carbon and low-alloy steel, thus providing an alternative method to using inhibition for corrosion control.

Coverage of Report - This report covers a wide range of corrosion mechanisms including stress corrosion cracking (SCC), forms of hydrogen embrittlement (HE), general corrosion, pitting and crevice corrosion, corrosion fatigue, and liquid metal cracking. This report is written for the engineer who has knowledge of the characteristics of corrosion systems encountered in oil and gas production, and who has experience with oilfield applications of CRAs.

Organization of Report - This report is organized to allow information on a specific subject to be found without reading the entire report. However, reading Sections 1, 2, and 3 in their entirety before proceeding will help to utilize the detailed information.

CORREF Reference System - Sections 5 and 6 give descriptions of specific equipment and experience using certain alloys, including failures and successes, that have been reported to the committee. Section 5 contains descriptions, and Section 6 contains graphical presentations of this experience. Both sections use the CORREF reference identification system, which is explained fully in Appendix A. Reference numbers in accordance with the NACE International Publications Style Manual are also used, both alone and in addition to the CORREF numbers, to allow for ease of locating all references.

Use of SI and English Units - Measurements in this report follow the NACE Publications Style Manual, Paragraph 2.10. Some measurements are listed in U.S. Customary units followed by the Systeme Internationale (SI) conversion, while others are listed in SI units first. In accordance with the Style Manual, the actual measurements recorded are shown first followed by the conversion.

Limitations of Use -This NACE technical committee report does NOT present standardized materials selection methods or materials specifications. This report presents information on current industry practices only and should not be interpreted as recommending use of the materials listed herein.