All TMX steel rebars are TMT rebars, but all TMT rebars are not THERMEX/TMX rebars. The structural uniformity is the highlight feature of TMX Bars. THERMEX process converts the bar surface to a hardened structure. The subsequent phase involves cooling at ambient temperature to allow the hot core to temper the surface through the Thermex exchange. This results in a unique structure of tempered martensite periphery and fine-grained ferrite-pearlite at the core. This structure should be uniform throughout the cross-section of rebars.