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steel sheet Ralco


The steel sheet is actually a metal sheet with a smooth surface that can be rolled and coiled, and it is supplied to the factories rolled and coiled in the same way. There are different types of steel sheets that are classified and named based on the production method and raw materials used in them.
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steel sheet Ralco

The steel sheet is actually a metal sheet with a smooth surface that can be rolled and coiled, and it is supplied to the factories rolled and coiled in the same way. There are different types of steel sheets that are classified and named based on the production method and raw materials used in them.


Types of steel sheets based on steel grade (raw materials used)

The classification of steel based on grade depends on its metallurgical composition.

Grade 304 is the most widely used among other steel sheets because, in addition to maintaining formability and weldability, it also shows good corrosion resistance. 303 base is not available in sheet form.

316 grade steel shows more resistance at high temperatures than 304 steel and has better performance against corrosion. This type of steel is usually used for pumps, chemical equipment, valves or marine industries.

Grade 410 is a type of heat-resistant stainless steel, but it shows little resistance to corrosion and is usually used for making cutlery.

430 grade steel is the most popular type of steel and is an inexpensive alternative to the 300 series. It is usually used when high corrosion resistance is not the main criterion. It is mostly used for the production of household appliances that have a glossy finish.


Types of steel sheets based on the production method

black sheet

The surface of these sheets is not smooth and polished, and that is why they are called black sheets. The hot rolling method is used to make these types of steel sheets. In the rolling method, rollers are used to shape the steel to reach the desired thickness. These sheets are used in the production of hollow bodies, seamed pipes, tankers, shipbuilding, all kinds of profiles, etc.

Galvanized sheet (white sheet)

Corrosion is one of the most important factors that are considered during the production of steel products, and for some industries, the use of stainless steel is very expensive. As a result, a solution should be used so that steel sheet can be produced at a lower cost. made it as resistant to corrosion as possible. This is why galvanized coating is used to produce stainless steel sheet.

To produce galvanized sheets, the steel sheet (of oil type) is immersed in a bath of molten zinc and allowed to cover the surface of the sheet. The more zinc used to cover the sheet, the more resistance It is also higher against corrosion. Galvanized sheets have a longer life and can work up to 50 years under normal conditions. If they are used in contact with extreme humidity, they can last up to 20 years without the need for maintenance or repair. , work well. Galvanized sheet is used for water pipes, cabinets, tankers and water storage tanks, etc.

oiled sheet

Oil sheets are not actually greasy and this name is given to them because of their polished and shiny surface. The cold rolling method is used for their production, which is the reason for the shiny surface of the sheet. The purpose of using the cold rolling method is to produce a steel sheet with high quality and at the same time with a low thickness. In this method, the output product from the hot rolling process. After cooling, it enters the acid washing process and then it is coiled again. Then it is again entered in the cold rolling process and this time the steel sheet passes through the rollers at a low temperature to achieve the desired thickness for the sheet. These types of sheets are the basis for the production of galvanized sheets and are used in the production of refrigerator covers and other household appliances such as gas stoves, etc.

chequer plate

Geometric ridges are created on the surface of these sheets so that objects can be placed on them and moved more easily, because sheets with a polished surface do not have this possibility and the objects will definitely slide. Treading machines are used to produce the sheets, which create the desired protrusions on the steel sheet. These sheets are used in emergency stairs, floors of decks and pedestrian bridges, floors of trucks and vans, etc.

color sheet

The steel sheet normally has a metallic gray color. As a result, sometimes the surface of the steel sheet is covered with a layer of electrostatic paints. Currently, the color variety of steel sheet includes 15 colors and they are used to produce pavilions, roofs, roofs of sheds, household appliances, etc. The weight of these sheets is not high and they have good formability. The presence of the color layer increases their resistance to moisture and corrosion. To produce these sheets, the fats and impurities on the surface of the sheet are completely removed, and then after washing the sheets and going through other preparation steps, the sheets enter the painting process. The meaning of electrostatic painting is that in the production process of these sheets, some kind of paint (of epoxy, polyester, polyvinyl chloride or polyurethane) is sprayed on the sheet and then the steel sheet is put into the furnace.

Color galvanized sheet

One of the products produced in steel industry is colored sheet. The production process of this colored sheet follows the production of galvanized sheets and adds a protective layer to it. In this way, the galvanized coil enters the colored sheet production system and its preparation procedure begins. The galvanized sheet is washed with a degreasing solution and its surface is polished with a brush. This process is repeated twice to clean the surface of the galvanized sheet from any possible dust and contamination. After this step, the sheet is dried and ready for the next step using hot air. Now, to increase the steel's resistance to corrosion, as well as the greater adhesion of the paint to the steel surface, a special chemical substance is sprayed on both sides of the sheet surface and dried again. The property of this material is to prevent peeling of the paint.

Color sheet coating

Now the sheet enters the coating area and receives the first coat of paint called primer on both sides. Polyester paints are used for primer. Then it enters the oven to bake the original color. After complete baking, the sheet is cooled and ready to receive the final layer of paint by the roller and baked again. The top coat used in the work is one of the types of Polyester, Epoxy, Polyurethane, PVDF, Acrylic and Polyamide, depending on the manufacturer. Back Coat is generally Epoxy or Polyester.


Purchase and price of all kinds of steel sheets from the market

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