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08086 Balance of Alloying Elements in Wear Resistant Co-Based Alloys for Oil Drilling Applications

Picture for 08086 Balance of Alloying Elements in Wear Resistant Co-Based Alloys for Oil Drilling Applications
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Product Number: 51300-08086-SG
ISBN: 08086 2008 CP
Author: Matthew X. Yao and James B. C. Wu
Publication Date: 2008
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Co-based alloys have played an important role in oil drilling for many years. They are mostly used for resisting wear and corrosion in various forms, including castings, weld overlays, and wrought sheets and bars. These alloys typically contain Cr, W and/or Mo. Most of them contain relatively high C content in order to increase hardness for wear resistance but at the expense of corrosion resistance. The alloying elements must be properly balanced to satisfy the requirements of both corrosion and wear resistance for a given application in oil drilling. The issue of sulfide stress corrosion cracking has not been well studied for these alloys since they are mostly used in conditions that are not subject to such cracking. However, this needs to be clarified. This paper examines the effects of the alloying elements of the Co-based alloys on the microstructure and their performance in laboratory tests as well as various applications in oil drilling. Both traditional and recently developed alloys are included. The test results of sulfide stress corrosion cracking of these alloys are also presented and discussed.
Co-based alloys have played an important role in oil drilling for many years. They are mostly used for resisting wear and corrosion in various forms, including castings, weld overlays, and wrought sheets and bars. These alloys typically contain Cr, W and/or Mo. Most of them contain relatively high C content in order to increase hardness for wear resistance but at the expense of corrosion resistance. The alloying elements must be properly balanced to satisfy the requirements of both corrosion and wear resistance for a given application in oil drilling. The issue of sulfide stress corrosion cracking has not been well studied for these alloys since they are mostly used in conditions that are not subject to such cracking. However, this needs to be clarified. This paper examines the effects of the alloying elements of the Co-based alloys on the microstructure and their performance in laboratory tests as well as various applications in oil drilling. Both traditional and recently developed alloys are included. The test results of sulfide stress corrosion cracking of these alloys are also presented and discussed.
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