TPT November 2020

T E CHNOLOG Y

Customised in-line bright annealing systems THANKS to a reputation gained with traditional and consolidated bright annealing solutions, EMMEDI has been awarded, within less than one year, the supply of three unconventional in-line bright annealing systems from one of the major stainless-steel manufacturers worldwide – Sandvik. than the conventional furnaces with a consequent reduction in the length of the heating section. 

Both the heating inductor and the cooling section are assembled on a specific support frame, able to traverse on rails, perpendicularly to the production line, in order to clear the mill area when heat treatment is not required. The complete system (heating inductors and cooling tunnel) are cooled by means of a closed loop demineralised water-cooling system, mounted on an independent structure. To achieve brightness and hardness required by the annealing process, non-recycled pure hydrogen gas at a low rate is used for a perfect cleaning of tube surface in safety condition. The outgoing hydrogen is burned to prevent gas dispersion in the environment. SAET EMMEDI www.saetemmedi.com Ajax TOCCO www.ajaxtocco.com

The first two have been installed and started-up in September 2020, the third one is due by the end of January 2021. The systems, developed by EMMEDI in strict cooperation with the Sandvik team, consist of three complete bright annealing lines for coil-to-coil production of seamless tubes of small diameters. Cristian Iuliano, sales manager for the tube division of SAET SpA, said: “We are proud to have been commissioned three bright annealing furnaces for stainless-steel and nichel alloys tubes: design and performances over the standard make this system the perfect solution to meet Sandvik requirements and will contribute to the success of its great business lines worldwide. The highly customisation of the whole

process and of the equipment itself have been possible thanks to SAET EMMEDI skilled engineers who are always willing to look over the standard solutions.” EMMEDI know-how has been entrusted with the development of a highly customised system that innovates the technical approach to stainless steel seamless tubes production. Induction heating applied to this process reduces start-up times to a minimum and permits a power density higher

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NOVEMBER 2020