Reformer furnace tubes are designed to operate under high
temperature and pressure. Historically, these tubes exhibit
improved creep resistance at higher temperatures. The
improvements in creep resistance are directly attributed to
micro-alloying elements that combine with the carbon in the tube metallurgy to
form carbides. These carbides strengthen the tube metallurgy
and limit creep deformation. Present and future developments in
heat-resistant alloys are discussed in this article.