POST-BORIDING PROCESSES FOR TREATING PIPE AND RECOVERING BORONIZING POWDER

摘要

A process comprising:- placing a boronizing powder composition in a metal pipe comprising afirst end, asecond end, an inside surface and an outside surface;- heating the pipe to form a borided layer on the inside surface, and spentboronizingpowder;- removing the spent boronizing powder from the pipe, thereby forming anemptyboronized pipe;- heating the empty boronized pipe to above its austenitizing temperature,therebyforming an austenitized pipe;- quenching the austenitized pipe, thereby forming a quenched pipe;- tempering the quenched pipe, thereby forming a tempered pipe; and- threading the tempered pipe.