The Heat Treatment Congress in Cologne is a trade fair that focuses in particular on the topics of heat treatment and materials technology. Organized by the F&E Technologiebroker Bremen GmbH, this trade fair takes place every 2 years, usually in October, and attracts experts from all over the world. One focus of the trade fair is scientific findings from research and development. Current scientific research results are presented here, as well as valuable practical experience from daily heat treatment work. Specific topics that are the focus include annealing processes, thermal-mechanical manufacturing processes, straightening processes and energy efficiency in heat treatment. The latest innovations in the areas of materials, manufacturing and process engineering are also presented. The event will be held at the Cologne Trade Fair, one of Germany's leading trade fair venues, known for its modern infrastructure and excellent accessibility both nationally and internationally. Thanks to its central location in Cologne, the exhibition center not only offers optimal connections, but also a wide range of cultural and gastronomic offerings in the area. Every year, numerous experts, scientists and industry professionals visit the Hardening Congress to find out about the latest developments, expand their network and exchange ideas about current trends. For the 81st time there is the Heat Treatment Congress (HärtereiKongress) on 3 days from Tue., 13.10.2026 to Thur., 15.10.2026 in Cologne.