Hot rolled coil is one of the most widely used steel products produced by steel manufacturers around the world and has different price charts based on composition and details. Plates are divided into different types based on manufacturing specifications, appearance specifications and alloys used in them.
Each of these models have relatively different features and applications and are produced and supplied in various 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 of this plate was compared with a very cold (oily) plate. The general method of making hot plates is as follows:
The ingots enter the hot rolling line as slabs or plates, which become highly elastic and flexible when heated to a temperature of 1100 degrees Celsius. Then they pass through different rollers to reach the desired thickness.
It is worth noting that the heating plate has a dull and rough appearance during the production process due to sudden heating and cooling. For this reason, it is also called a hot rolling plate.
The hot plate is divided into two types, ordinary and industrial. Each of these two plates is made of a different alloy, so they have different chemical and mechanical properties.
Due to different dimensions and sizes, whiteboards are used in two basic ways in different sectors of the industry:
Direct method: It is used for making tanks or making the body of machines, cars and ships
Indirect method: for making other sections such as construction and industrial sections
Other applications of this type of sheet are:
Direct and indirect construction and tower construction
Construction of mobile tankers or ship tankers
To strengthen certain parts of the car such as chassis protection
Shipbuilding and submarine construction
Other industrial and heavy applications
ST37
ST37 sheet is made of low carbon alloy. You may ask what is the difference between parts made of low carbon alloys and other parts? The point here is that the weight percentage of carbon in a steel section 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. In addition, it produces more weight, a problem that is considered one of the disadvantages of ST37 plates.
ST52
The ST52 alloy plate is lighter than the previous plates. In addition, the plate is more resistant and stronger against tensile and shear stresses.
It is worth noting that ST52 sheet has more carbon than ST37 sheet. As a result, its weldability is lower than the previous sheet. 0.2% carbon, 55% silicon and 6% manganese have been used to make ST52 alloy. Manganese in the plate gives this inexpensive product elasticity, resistance to bending and load capacity.
Other types of gas stoves
The two types mentioned are the most common types of black or hot steel plates. This does not mean that plates are produced only in ST52 and ST32 form. They are also produced in other types, including:
HB:
The sheet has a scaly surface. In some cases, the cooling of the sheet changes its rectangular shape. This board is available in widths of 1200 and 1250 mm and its thickness is approximately 4 mm.
HC:
This plate is also available in thicknesses of 5 and 6 mm. The width of this sheet is also available in four qualities: 1300, 1350, 1400 and 1450.
Black plates or hot plates are products that are made by hot rolling and have larger dimensions and thickness than other steel plates, especially cold plates.
The plate is produced and supplied in various types including ST33, ST37, ST52, HB, 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 the workpiece or plate or changing the cross section of a material using the compressive force applied by rollers.
Due to the contact with the atmosphere, the surface of hot rolled products is opaque. That is why it is also called blackboard heating plate. Hot rolling requires proper temperature control to be successful. 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 rolling and tensile and pressure deformations and melt and change shape only in the hot rolling stage.
By raising the temperature of the steel above the crystallization temperature, it can be easily shaped and converted into different sizes.
The important thing about the temperature required for hot rolling is that the temperature must be evenly distributed over the surface of the steel to be rolled and its thickness should change uniformly.
Otherwise, the hotter parts will roll faster than the rest 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 coil sheet price
During hot rolling, the movement of the rollers on the molten metal increases its length and decreases its thickness. The price chart of hot coil sheet and other related products is listed on our site.
If you give the metal too little thickness, the motion of the rollers does not push the metal forward but goes back and forth over the metal to reduce the thickness, but the price of the tweed will increase considerably.
Rolled steel under hot rolling conditions requires additional leveling, for example by galvanizing, or adding leveling steps to increase lamination (volume) at the end of the rolling line, in coils of limited capacity.
In general, hot rolling can leave surface defects 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 surface contact with air. For this reason, they are also known as black sheets in the market.
Hot rolled coil functions
All kinds of steels, including hot-rolled plates, have their own chemical and mechanical properties and follow certain standards. The mechanical properties of the board are optimized during the production process.
At temperatures above 930°C, where the recrystallization process takes place, due to the compression of the steel during rolling, the resulting steel crystals are first crushed and then interlocked, and sometimes contain impurity elements that reach the surface. . In this process, the steel’s impact resistance and ductility increase.
One of the other effects that the plate forming process produces in steel is probably good weldability and fatigue resistance under variable loads.
Application of hot rolled coil
It should be noted that black or hot-rolled sheets are widely used in various industrial products. The most important application of hot plates in the industry is related to the supply of raw materials for a large part of the profiles.
