Iron is a material that has been used in many ways since the beginning of mankind. Hot rolled coil and its price are one of the leading trends in exporting countries and you can see the price chart as well on our website but before everything let’s take a look at iron itself.
Iron has been used to make tools in the past due to its durable construction. So much so that there was even a period in human history called the “Iron Age”.
The use of iron has varied over time and has become a basic material in all areas of everyday life. As the population increases, the construction of apartments and high-rise buildings has increased due to the demand for housing. Steel is a material made from a mixture of iron and carbon. Due to its durability, steel is mainly used in construction and various industrial sectors.
Hot-rolled coil is a type of steel that is mainly used in pipe making, construction, machinery, and some other consumer sectors. The manufacture of hot-rolled wide strips involves melting steel at a temperature of 926 degrees Celsius, casting molten steel into sheets, and rolling them into wide strips.
Characteristics of hot-rolled wide strips
Hot-rolled wide strips are preferably used in areas where large deformations and forces are not required. This material has many other usages as well.
HRC is often the first choice for pipes, vehicles, railways, shipbuilding, etc. First, the steel is milled at high temperatures. The molten steel is then poured into billets and rolled into coils. After this process, the hot-rolled coil must be cooled before it can be used.
Manufacturers mainly use modern technology for the cooling process to prevent the steel from shrinking, which can lead to dimensional errors in the coil. These defects have a negative effect on the price of the heating plate and can cause problems for the buyer entitled to make a complaint. The hot-rolled coil does not need to be flawless to work, and this characteristic is taken into account when pricing the HR coil.
HRC price
In the hot coil industry, the price of wear parts changes regularly, depending on various factors such as end-user demand, production costs, competition with domestic and foreign suppliers, and national economic conditions. And on a global level.
Different countries have different pricing policies, but they are generally priced in local currency. If the country is an importing country, the valuation is also in euros or dollars. Therefore, it is very important to follow the prices on a daily basis. As with the prices of other materials in the steel-consuming industry, manufacturers consider a number of factors when determining the price of HRC.
Hot-rolled wide strips are produced under strict quality control using advanced technology and equipment. HRC prices vary widely depending on width, thickness, weight, steel grade, and intended use. It is important to stay up-to-date when running a business. These details also affect HRC prices. There are many charts online showing today’s HRC prices.
The hot-rolled coil must not be confused with the cold-rolled coil, which is actually made from a hot-rolled coil. The production process of the cold rolled coil is more complex and the application of the material is different as it is used in more complex industries such as white goods and auto parts.
What is black iron?
ST37 sheets are one of the products manufactured using the hot rolling method (one of the methods of manufacturing thin metal sheets).
Therefore, the plates produced in this way are ultimately called hot-rolled plates or so-called black plates. Products made in this way use the term chalkboard because the components of the chalkboard melt at high temperatures and the color of the product becomes opaque, so the term chalkboard has always been referred to as “chalkboard”.
The steel plate has a highly polished and smooth surface. The black iron plate is a slang term for construction and other industries and refers to an iron plate that has been worked into a smooth and uniform shape. These types of sheets are produced by hot rolling and are considered hot-rolled sheets. It should be noted that the plate produced in the cold rolling process is called an oiled plate.
Black film production stage
The production process of the black steel plate starts with heating the steel ingot at a very high temperature (1100 degrees Celsius). The temperature is especially important in the production of boards. Hot rolling should be carried out at temperatures above the recrystallization point of the steel.
This heated material then passes through several rollers which eventually produce a black sheet. In this method, the produced slabs are first put into a preheated high-temperature furnace. After the metal leaves the preheating furnace, an oxide layer forms on the metal surface.
To remove this oxide scale, a shell washing operation is carried out, which has a large effect on the temperature drop on the tank surface. Rough rolling is a step after stripping. In this step, the workpiece passes through the rollers several times and gradually reaches the desired size.
During this process, the temperature distribution of the load is affected by several factors, including heat transfer to the environment and heat caused by plastic deformation, which reduces the thickness of the plate by 15 to 30 percent. The coarse roll has 2 to 3 racks. After the final scrubbing stage, the plate enters the finishing stage.
The thickness of the board
The load passing through the transfer table is sent to the final rolling stand to produce the sheet. The line consists of 5 to 7 shelves, where the thickness of the board is reduced to 1.8 to 3 mm. However, common board sizes on the market vary from 1.5mm to 100mm. The price of black sheets in the market is also determined according to the thickness, size, and quality of the produced sheet. The temperature of the plate at the end of the final rolling drops to around 900 degrees Celsius.
Use of black paper
Applications of boards include general construction, car manufacturing, production of tanks and special tanks, shipbuilding, and heavy metal industry.
In addition, the product is produced in both fabric and roll form. Before we discuss the types of applications blackboards are used in various industries, it is interesting that hot-rolled sheets are known as blackboards because of their black and matte appearance. The uses of whiteboards in different industries are many and varied. These industries include:
- Building and shed construction
- Car manufacturer
- transportation
- Shipbuilding: Boards are used for shipbuilding.
- agriculture
- Heavy machinery: Black plates are used for body construction of heavy machinery.
- Reservoir construction
hot rolled coil price trend chart
Hot rolling is a heat treatment process in which metal is heated above the recrystallization temperature until it softens in order to change it by coil rolling.
The price chart and trends are on the website. Here we talk about its procedure. This process is used to create shapes with ideal geometry and material properties while maintaining the same metallic volume. The hot metal is passed between two rollers to straighten it, increase its length, reduce the cross-sectional area and achieve a uniform thickness.
Hot-rolled steel is the most common product in the hot-rolling process and is widely used in the metal industry as an end product and as a raw material. Gleneden Saeed is one of the metal industries active in the production of hot-rolled sheets for wrought iron doors.
The predominantly inhomogeneous grain structure of the metal consists of large columnar grains grown along the direction of solidification. It is generally brittle with weak grain boundaries and may contain defects such as shrinkage voids, and pores caused by foreign matter such as gases and metal oxides.
Hot rolling destroys the grain structure and destroys the boundaries, resulting in the formation of a new structure with strong boundaries and a homogeneous grain structure.
In a hot rolling operation, a heated sheet is placed between the walls of the rolls, and the sheet is then reduced in thickness each time it passes through each roll. (During a rolling operation it can be placed between the wheels several times). After compression and stretching, the surface of the sheet is smoother and the holes disappear.
Features of hot rolling
Compared with cold rolling, hot rolling has similarities and differences, in some cases, it is better than cold-rolled plates, and in most cases, its mechanical properties are weaker than cold-rolled plates. But in general the characteristics of hot rolling are:
- High toughness and resistance
- Formability by hot rolling
- Vibration and pressure resistance
- Flexibility is also possible with hot rolling
- The ability to weld hot-rolled sheets is also suitable
Why is hot-rolled sheet called board?
During hot rolling, the plate is transformed from steel plates and ingots into thinner steel plates. To have a proper rolling bed, these plates need high temperatures to get the metal crystals ready to change shape. Therefore, by using high temperatures in metal melting furnaces, their color becomes black and sooty. Therefore, these plates are called boards or hot-rolled plates.
What is a hot rolled product?
- black st37 and st52 sheets
- hot-rolled steel plate
- Various steel and steel angles
- Types of steel and stainless steel studs
- Types of thick steel and stainless steel profiles
- Mannesmann steel pipes and tubes
- Application of hot-rolled plate
Today, many applications are assigned to hot-rolled products. For example, the following applications of hot-rolled plates can be mentioned:
- Application in auto parts
- Various capsules, tubes and cylinders
- Industrial machine constructions such as saws, presses, milling machines, processing machines, etc.
- Hot-rolled sheets are widely used in agricultural equipment
- Hot-rolled products are widely used in construction
- Used on train tracks, metro stations, bridges and shipyards etc.
Formability of hot-rolled plate
In hot-rolled steel sheets, our workability is lower than for cold-rolled steel sheets. One of these reasons may be the flexibility and hard formability of hot-rolled sheets.
- Hot rolled was the first steel plate to really change thickness
- These are not too thick and we can use them in some products
- But in general, hot rolling can give steel flexibility
With the forming of products such as plate, butt angle, Mannesmann pipe, Mannesmann profiles, all kinds of steel are possible.
What are the disadvantages of hot-rolled steel?
As we mentioned, hot-rolled steel is weaker than cold-rolled steel in some mechanical properties. But you should know that hot rolling is the most necessary and the first heat treatment of the steel plate, which makes the steel plate a flexible and efficient plate. Among the disadvantages of this steel, the following can be mentioned:
- Short-term armor of steel
When the surface of the plate is oxidized by air, the steel will gradually rust. Hot-rolled carbon steel is always at risk of rusting due to the lack of a coating that resists environmental oxidation. From New Roo, in some cases, a metal spray coating is used with other coatings to prevent rust
- Corrosion of hot-rolled plate alloys
When hot-rolled sheets are exposed to corrosion for a long time, the outer layer of the steel can be damaged, which can be a problem in some cases. Exposure to heat treatments, chemicals, abrasives, etc. Some other conditions that cause particle or surface corrosion are defects in the mechanical properties of hot-rolled steel.
The beginning of the rolling process dates back to the 17th century. In the 17th century, they simply put 2 cast iron rollers in a wooden frame and performed the rolling operation by passing tin and lead between them and reducing their cross-section.
Over time, they used larger rollers, moved by horses or water blades, and used grooves to shape rolled products belonging to this era.
To reduce the force required to rotate the rollers, instead of the large rollers, use smaller rollers that rotate with the larger rollers, thus creating a rack with four rollers.
After the invention of the steam engine, the power limit was removed, the rolling stand became larger, and a powerful steam engine was used to roll steel ingots. With the advancement and industrialization of the rolling industry, the industry became a substitute for other methods of forming metals. He worked as a blacksmith and cook.
In addition to the rolling process, other parts of the rolling mill are such as the casting furnace for producing the primary ingots, the preheating furnace for heating the ingots, the conveyor belt, the pickling tank, the heat treatment furnace, the galvanizing tank. for packaging and … also follows their evolutionary process.
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