Scale Formation Minimization on Internal Surface of Seamless Hot-Rolled Pipes

Requirements for the process of pipe production operations, which reduce the formation of hard-to-remove scale on internal surface, have been developed. According to the study results of chemical reaction features of deoxidizing materials with scale on the internal shell surface, these requirements are based on the flow process analysis of the production of seamless hot-rolled pipes in the lines of contemporary pipe-rolling plants with mandrel mills and in heat treatment areas. A series of experimental pipe rolling has been carried out on the plants of PAO TMK using the INCOAT technology and equipment of SMS group Company (Germany). The results of the work have confirmed the inhibition effectiveness of active scale formation on the internal shell surface through combination of piercing and treatment of the internal shell surface with deoxidizing material.