The development of a new family of TMA heat resistant alloys is summarized. Creep-rupture, relaxation, high temperature tensile, aged ductility, oxidation and carburization data are presented. These data are used to compare reformer furnace tube a Toys TMA 4700 and TMA 6300 with HK-40, HP-45 and HP-45 + Nb. Pyrolysis furnace tube alloys TMA 4750 and TMA 6350 are compared with high silicon HK-40 and HP-45 alloys. Computer analysis of reformer furnace tube life for TMA 4700 and HK-40 alloys suggests the existence of an optimum wall thickness for maximum tube life. The optimized life of a TMA 4700 reformer tube is compared to that of an HK-40 tube.

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