The Sellero plant was built at the end of the 1960s and was acquired by Riva Acciaio in 1995. Together with Malegno and Cerveno, this factory completes the triad of Riva Group plants in the Camonica valley, an area with a long tradition of steel production.
The factory consists of a rolling mill that produces hot rolled steel products and a high-tech turnery where rolling rolls are machined and heat-treated.
Thanks to significant investments made in the years following the acquisition – especially on the beam rolling mill whose production capacity was doubled – today the Sellero hot rolling mill can produce HEA, HEB, UPN, IPE, IPN steel profiles as well as flat and square rolled products and billets and has 140 employees.
The rolling mill department is equipped with a pusher-type reheating furnace with a capacity of 80 t/h, a two-roll reversible roughing mill, an open intermediate rolling mill with two three-roll stands, a finishing block with two reversible stands and a universal finishing stand.
The final part of the rolling mill department has a cooling bed, an inline straightening machine for profiles and beams, two cold cutting lines with chip removal, a cutting line with shear for cutting to length and three bundling, binding, labelling and weighing lines.
he factory is also equipped with two roll-straightening lines for round rolled products and heat treatment furnaces for softening, stress-relieving, improving cuttability, ferrite-pearlite annealing and gas fired bell, sliding bell and bogey hearth furnaces for normalisation. The well-equipped internal laboratory can perform technological tests on the whole product range.
In the turnery department, where 50 people work, rolling rolls are generally machined and heat-treated.
Machining operations include grinding, roughing, finishing, milling, reaming and refacing. Heat treatments on rolling rolls are carried out in bell, sliding bell and bogey hearth furnaces; reheating is performed by methane gas burners, while cooling is provided by air ventilators. At the end of processing, the rolls undergo a strict final inspection and are then labelled, protected, packed and sent to customers.