Excellent abrasion resistance is required of pipes that are used in slurry transportation systems such as those for transporting coal ash in pulverized-coal-firing boilers. We have developed an abrasion-resistant pipe named "NK-SL80" for transporting slurry. This paper reports properties and test results of the newly developed pipe. NK-SL80 is a 0.15%C-1.5%Si-1.5%Mn-Fe steel pipe with dual-phase microstructure composed of ferrite and martensite. The martensite phase provides abrasion resistance and the ferrite phase provides workability. The newly developed pipe contains smaller amounts of elements such as C and Mn than conventional abrasion-resistant pipes, and hence shows excellent field weldability compared with high-carbon abrasion-resistant pipes.

Abrasion-resistant, slurry, dual-phase microstructure, weldability, network structure, ferrite and martensite, coal ash