Centro Sviluppo Materiali S.p.a.

Danieli & C. Officine Meccaniche S.p.a.

Henkel Kgaa

Thyssenkrupp Acciai Speciali Terni S.p.a.

Stefano Luperi

Alessandro Dulcetti

Milorad Pavlicevic

Alessandra Primavera

Yean Demertzis

Nicoletta Zacchetti

Luca Lattanzi

Simone Guanin

Gianvincenzo Salamone

Giovanni Vespasiani

Stefano Mantovani

A continuous annealing and pickling process of flat cold-rolled products, such as stainless steel strips, to obtain a high surface quality product at high production rates and with a low environmental impact. It comprises the following steps: heating, up to a temperature comprised in the range 650-1050&#xb0; C., in an atmosphere with an oxygen content comprised in the range from 0.5 to 12%; heating for a time comprised from 10 to 200 sec up to a temperature comprised in the range from 650 to 1200&#xb0; C. in presence of oxidizing agents and/or inert agents; cooling down to temperatures comprised in the range from 650&#xb0; C. to ambient temperature in presence of oxidizing agents and/or inert agents; thermochemical or electrolytic descaling and finally possible pickling and/or passivation, by means of the use of pickling baths consisting of mineral acid solutions.

Annealing and pickling process

Environment-friendly process for descaling, pickling and finishing/passivating in a continuous, integrated and flexible manner, applicable to any type of stainless steel, regardless of its physical structure, chemical composition and nature of surface oxides to be removed, within a single plant in which the required chemical, electrochemical, mechanical and hydromechanical treatments are carried out, merely diversifying the operative conditions of each treatment according to the stainless steel type to be processed. The process and the plant according to the invention allow elevated reaction rate, excellent surface quality, low energy and chemical reagent consumption and total environmental compatibility. The figure shows the block diagram of an embodiment of the plant according to the invention.

Process and plant for descaling, pickling and finishing passivating stainless steel strips, and strips so obtainable

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Pomezia, Italy

Stefano Luperi