Abstract
The severe environments in oil drilling and refineries often require highly wear and corrosion resistant alloys to make the operations run without excessive downtime. This paper is intended to give a review of the traditional as well as recently developed alloys in terms of their characteristics and properties with emphasis on the cobalt-based alloys and a new nickel-based alloy.
Metallurgically, cobalt alloys can be categorized into three distinctive types. Each type of alloys share common features in the microstructure and thereby, similar properties.
There have been many nickel-based alloys used in the oil industry but most of them have a chemical composition suitable for making wrought products. A new nickel alloy designed specifically for coating or overlaying is introduced in this paper.
To put these high performance alloys to use require making them into usable products. The paper describes various product forms and the application methods of coating and overlaying, as well as the effect of processing on the microstructure. Finally, examples of using these alloys in the four segments of the oil and gas industry are discussed.
