MTEK 25-35MA is a solid solution microalloyed Fe-Ni-Cr-Nb casting alloy with good high-temperature creep strength. It is intended for use in pyrolysis cracker furnaces. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on high temperature performance as well as casting, heat treating, machining, and joining. Filing Code: SS-1249. Producer or source: MetalTek International. Originally published July 2016, revised September 2016.