Production Lines2019-04-29T17:34:50+00:00

The pickling unit of Seven Diamonds industries company is operating at a capacity of 1 million tons per year. The first step in the production of galvanized and cold rolled steel sheets is the cleaning of the surface, which is carried out in pickling process. The process is based on conveying the strip through hydrochloric acid baths to dissolve the surface oxides and contaminants.

In Seven Diamonds industries company, there are two Reverse rolling mills (a 6-high and a 4-high mill stand) with a production capacity of one million tons per year. In this unites, steel is passed forward and backward through a pair of rolls, reducing the thickness incrementally with each pass, at the ambient temperature. The cold rolled products are sent to other lines to continue other processes.

In the Seven Diamonds industries company, annealing unit -with a capacity of 360000 tons per year- the steel coils are heat treated to achieve the desired mechanical properties with a uniform microstructure. The annealed products are sent to the temper mill after cooling.

In the seven diamonds industries, two hot-dip galvanizing lines are operating with a capacity of 604,000 tons per year. The cold rolled sheets enter to the continuous annealing furnaces (with a protective atmosphere) after degreasing, and subsequently are coated passing through the galvanized melting bath. Finally, they are passivated by chromate coating to prevent the formation of white rusts (wet storage stains) and improve the corrosion resistance.

The Seven Diamond Industries Company, for the first time in the country, exploited the production line of Galvalume steel sheet with the capacity of 360,000 tons per year, in 1396. The cold rolled sheets enter to the continuous annealing furnaces (with a protective atmosphere) after degreasing, and subsequently are coated passing through the Galvalume melting bath with the composition of 55% aluminum, 43% zinc and 1.5% silicon. Finally, they are passivated by chromate coating to prevent the formation of white rusts (wet storage stains) and improve the corrosion resistance. Galvalume coating protects the steel substrate by sheltering mechanism (due to existence of aluminum) as well as galvanic mechanisms (due to existence of zinc).

The seven diamonds company’s color coating line is designed to produce high quality pre-painted steel sheet with a capacity of 200,000 tons per year. I this line, skin passed Galvalume sheets are chromate treated to improve the corrosion resistance and increase the adhesion of the paint to the surface of the sheet. In the next step, the Primer and Back Coat colors are applied to the upper and lower surfaces of the sheet, respectively and are baked. After cooling, the top coat is applied to the sheet and the final baking is carried out. At the end, a protective film made of polyethylene or polypropylene is applied on the surface of the sheet in order to prevent paint surface damages.