Thermex® TMT bars derive their strength from a controlled, in-line rapid water quenching process. Thermex® Cooling is a process specifically developed to meet the demand for high-strength steel reinforcement bars with high ductility. Directly after the last rolling stand, the bar passes to the Thermex® cooling system and is subjected to a short intensive cooling of the surface. This leads to drastic reduction in surface temperature and surface hardening (martensite structure) whereas the core is largely unaffected. After leaving the Thermex® system, the Thermex exchange takes place whereby the core re-heats the surface, thus tempering the martensite. The thermal exchange is completed at the cooling bed and the resultant bar has a unique structure of tempered martensite at the periphery and a fine grain ferrite – pearlite in the core. This provides the higher strength and ductility to the finished material. Such a structure is guarantee of a TMT and only unit Thermex® system ensures this in entire length of the bar.