*2.2.2 "Crystalline" hardbanding materials*

At the end of 1992, Arnco Technology Trust, Ltd., developed a new generation of chromium carbide hardbanding material—ARNCO 200XT™. The hardbanding can effectively reduce the wear of the casing and ensure the durability of the drill pipe joint in the open hole section, which can minimize the wear of the drill pipe joint. However, with ARNCO 200XT, it is easy to generate micro-cracks in the application and welding process. Although it has no influence in the use process, all the cracked parts should be removed during the reapplication and welding. Subsequently, the company has developed many hardbanding materials, such as ARNCO 100XT, ARNCO 300XT, ARNCO 150XT, and ARNCO 350XT, to overcome the problems existing in ARNCO 200XT [16]. The tool performances of these hardbanding materials are shown in **Figure 2**.

Arnco Technology has led the hardbanding industry since pioneering the use of casing-friendly hardbanding two decades ago. To better understand the development of "crystalline" hardbanding materials, a more detailed introduction can be found in the following:

#### *Strength of Materials*

