The hot rolled coil is one of the most widely used steel products and is produced by numerous steel producers around the world and has different price charts based on the composition and details. The plates are divided into different types based on manufacturing characteristics, appearance characteristics, and the alloys used in them. Each of these models has relatively different features and uses and is produced and supplied in a variety of sizes and dimensions. One of the most famous steel sheets is hot-rolled sheets, which are produced by hot-rolling and passing through high-temperature furnaces. The production process for this plate was compared to the too cold (oil) plate. The general method of making hot plates is as follows: Ingots enter the hot rolling line in the form of sheets or plates, which become very elastic and ductile when heated up to 1100 degrees Celsius; they then pass through different rollers to achieve the desired thickness. 
It is worth mentioning that during the production process, the heating plate has a dull and rough appearance due to sudden heating and cooling; for this reason, the hot-rolled plate is also called a "board". The hot plate is divided into two types: ordinary type and industrial type. Each of these two plates is made of a different alloy, so they have different chemical and mechanical properties. Due to the different sizes and dimensions, whiteboards are used in two basic ways in different parts of the industry:
- Direct method: used to build tanks or to build the bodies of machines, cars and ships
- Indirect method: for making other sections, such as construction and industrial sections
Other applications for this type of sheet include:
- Construction and tower construction, direct and indirect
- Construction of different types of mobile tankers or different types of ship tankers
- To strengthen certain parts of the car, such as chassis protection
- Shipbuilding and submarine construction
- Other industrial and heavy duty applications
ST37 ST37 sheet is made of low carbon alloy. What is the difference between sections made of low carbon alloys and other sections, you may ask? The point here is that the weight percentage of carbon in a section steel is directly related to the weldability and some other mechanical properties of those sections; in other words, the lower the percentage of carbon in a steel section alloy, the higher its weldability. Therefore, this type of board has better soldering ability compared to other hot boards; moreover, it produces more weight, a problem considered to be one of the disadvantages of ST37 plates. ST52 ST52 alloy plate is lighter than previous plates; moreover, the plate is more resistant and stronger against tensile and shear stresses. It is worth mentioning that the ST52 sheet has a higher carbon content than the ST37 sheet; as a result, its weldability is lower than the previous sheet. 0.2% carbon, 55% silicon and 6% manganese are used to make ST52 alloy. The manganese in the plate gives this inexpensive product its elasticity, resistance to bending and load capacity. 
Other types of hotplates The two types mentioned are among the most widespread types of black or hot steel plates; this does not mean that the plates are only produced in ST52 and ST32 shapes; they are also produced in other types, including: HB: The sheet has a scaly surface. In some cases, cooling the sheet changes its rectangular shape. The board is available in widths of 1200 and 1250 mm and its thickness is approximately 4 mm. HC: The plate is also available in 5 and 6 mm thicknesses. The width of this sheet is also available in four qualities: 1300, 1350, 1400, and 1450. Black or hot plates are products made by hot rolling and have a wider range of sizes and thicknesses than other steel plates, especially cold plates. The plate is produced and supplied in different types such as ST33, ST37, ST52, HB, and HC. Each of these plates is made of a different alloy and has different chemical and mechanical properties. Rolling in metalworking is the process of reducing the thickness of a workpiece or plate or changing the cross-sectional area of a material by means of the compressive force applied by the rollers. 
Due to contact with the atmosphere, the surface of hot-rolled products is matte. That is why a heating plate is also called a blackboard. Hot rolling requires proper temperature control to be successful. The raw materials must be heated to a uniform temperature. Hot-rolled sheets are produced at high temperatures (usually above 926°C) through rolling rolls. The hot-rolling method is usually used for steels that are resistant to cold-rolled deformations and tension and compression, and are melted and reshaped only in the hot-rolling stage. By raising the steel's temperature above the crystallization temperature, it can be easily shaped and transformed into different sizes. An important point about the temperature required for hot rolling is that the temperature must be evenly distributed over the surface of the steel to roll and vary its thickness uniformly. Otherwise, the more heated parts will roll earlier than others and will not get a uniform shape. In general, hot rolling is stopped when the temperature reaches 50-100°C above the crystallization temperature. 
hot rolled coil sheet price
During hot rolling, the movement of the rollers over the molten metal increases its length and reduces its thickness. The price chart of hot rolled coil sheets and other related products is mentioned on our website. If you give the metal a very small thickness, the movement of the rollers does not push the metal forward but moves back and forth on the metal to reduce its thickness, but the price of tweed increases significantly. Rolled steel in the hot rolling condition requires more leveling, for example by galvanizing, or adding leveling steps to increase delamination (volume) at the end of the rolling line, in coils of limited capacity. In general, hot rolling can leave surface imperfections such as scales or pits that require grinding and finishing to make the surface smooth and uniform. Therefore, the quality of hot-rolled steel is lower than that of cold-rolled steel. The hot-rolled sheet has a matte surface due to its surface contact with air. That is why they are also known as black sheets in the market. Functions of hot rolled coil All types of steel, including hot-rolled plates, have their own chemical and mechanical properties and follow certain standards. The board's mechanical properties are optimized during the production process. 
At temperatures above 930 degrees Celsius, where the recrystallization process takes place, due to the compression of the steel during rolling, the resulting steel crystals are first crushed and then locked together, sometimes containing impurity elements that reach the surface. In the process, the impact resistance of the steel increases, as does the ductility. One of the other effects that the plate production process produces in steel is probably good weldability and fatigue resistance to variable loads. Application of hot rolled coil It should be noted that black or hot-rolled sheets are widely used in various industrial productions. The most important use of hot plates in industry is related to the supply of raw materials for a large part of the profiles. On the other hand, these plates are used in the production of machines and large structures, as well as in the construction of special tanks, therefore the price of boards (also called heating plates) is one of them. Factors affecting the speed of industrial production. The main applications of hot steel sheets are construction, industrial structures (profiles), oil and gas pipelines, re-rolling and painting, and cold steel sheets are also used in the automotive industry and household appliances. The goal of metal rolling is to bring a blank or sheet into the desired shape. The final product is rolled, sheets or rebar. 
After the shape change is completed, the final product is cut to the required length with wire cutting equipment such as scissors and saws, and after the operation and inspection are completed, it is packed and transported to the product warehouse. . In plate production, two different techniques are used, called cold rolling and hot rolling. hot plate type black paper A black steel plate (hot-rolled) is called a hot-rolled plate. Hot rolling is one of the methods for producing metal sheets with low ihicknesses, and the sheets produced by this method are gradually called hot-rolled sheets or so-called black sheets. The reason why the term chalkboard is used for products made in this way is that the color of the product becomes opaque at high temperatures due to the melting of the components of the chalkboard. For this reason, the term blackboard has been used for naming. Types of black sheets There are two types of boards in the market, ordinary board ST52 and industrial board ST37, ST37 board is mainly used for building purposes and shed construction, while the ST52 board is used for dam construction, petrochemical and storage tank construction, and other purposes. 
Commercial samples are approximately 60 mm thick; these sheets can be cut into small pieces. For example, a sheet of 4 mm thickness is 100 cm wide and 125 cm long. Syl sheets After the steel is hot rolled, the surface of the steel is exposed to oxygen in the air to form iron oxide. Many methods have been used to remove iron oxides. The preferred method in steel is steel pickling. In this method, the steel plate is washed with acid. The pickling process is called "Pickling" in English. Pickling is basically the removal of oxides by dipping the steel plate in acid. The pickled steel plate is washed with clean water to remove the impurities remaining on the pickled plate. Pickling solutions are used for pickling, which usually contains acid, to remove surface impurities. How to distinguish between hot and cold dishes The process of making a hot plate is different from a cold plate. Hot plate is a process related to the extraction and melting of metal, mainly produced as a sheet or steel sheet and placed between a set of rollers. Sheets are simply deformed or cut into steel sheets. The sheets are over 1000 degrees Fahrenheit. Cold rolling is one of the metal processes where the temperature is close to a normal temperature which is changed by rollers. Cold sheets are often used to reduce the thickness of steel sheets or plates and increase the strength and hardness of metals. In general, the cost of a cold plate can be double that of a hot plate because the processing process for a cold plate is more complicated than for a hot plate. 
Use of hot and cold plates Hot plates are always used to produce larger products, as larger products require a sharper shape. Hot-rolled sheets are used as raw materials for the production of cold-rolled sheets and coated sheets. Smaller products must be more durable and flexible. That is why they are always made of cold steel. Cold plates are products made of steel. The material is made of hot steel without heating and thinned on a lathe. Among the applications of cold sheets, we can mention the following: car parts, sanitary ware, construction, household appliances, electrical appliances, furniture, etc. Advantages and disadvantages of a hot plate compared to a cold plate: Cold plates have more precise dimensions than hot plates, which are produced by the hot plate process. The cold plate is now formed through a cooling process that helps it reach its final size. However, the shape of the cold plate is limited and can be deformed into round, square and flat shapes. If the size and width are small and the section is uniform, other shapes can also be considered as cold plates. During the cooling process, the heating plate is reshaped into a different shape, resulting in an inflexible final product. Compared to cold plates, hot plates are flexible and can be made in different shapes.