Buy and price of hot rolled coil china
In China and especially in factories related to hot-rolled coils and other parts of the world, the export of rebar and hot-rolled products has grown significantly compared to the rest of the world, but there are no buyers for this quantity and volume.
hot rolled coil china
Rebar export prices also rose to $470-$490 per ton FOB on rising domestic demand and prices.
China's export hot plate has become cheaper as demand falls, but the downward trend is unlikely to continue in the near term as the domestic market is bullish. Hot plates exported from China are currently being offered at $500 to $510 per ton FOB, down $5 per ton.
Prices are still high and there are no foreign buyers.
Rolling is the process of reducing the thickness of a piece or plate or changing the cross-sectional area of the material by the applied compressive force of rollers. In this process, ingots, sheets and billets are converted into thinner sheets.
It is worth mentioning that almost 90% of metal products are rolled at least once, which provides a standard product of uniform quality and relatively low cost. The first step in rolling to turn semi-finished products into finished products is left-hand rolling.
The beginning of the rolling process can be traced back to the 17th century, when two cast iron rolls were placed in a wooden frame, the rolling was done by passing tin and lead between them and reducing their cross section.
rolling process
During rolling, the metal passes between two rollers that rotate in opposite directions.
The distance between these rollers is slightly less than the thickness of the incoming metal. Since the surface speed of the roller is higher than the speed of the incoming metal, friction between the roller and the metal causes the metal to move forward, increasing its length and decreasing its thickness.
It is important to note that the thickness reduction depends on the amount of friction between the rollers and the metal surface.
Rolling is divided into two categories: hot rolling and cold rolling:
hot rolled
Like all other heat working processes, hot rolling requires proper temperature control to be successful. The raw material must be heated to achieve a uniform temperature.
If this temperature distribution is not uniform along the length of the workpiece, the rolling of the workpiece will not be uniform.
The hot rolling process is normally completed when the temperature of the part drops to 50-100 degrees Celsius above the recrystallization temperature. Such quenching temperatures ensure the formation of fine grain sizes and prevent the possibility of unwanted strain hardening.
Metal parts produced by hot rolling have lower strength than cold rolled products. In addition, hot rolling is suitable for large ingots and requires less equipment and units
cold rolled
Cold rolling can be used to produce sheets, strips, bars, and rods with extremely smooth surfaces and precise dimensions. Cold rolled sheets and strips can be produced in a variety of conditions including shell, quarter hard, semi-hard, and full hard.
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What are the characteristics of the cold plate?
Cold plates have different properties based on the alloys used in their construction, including:
- It has a very transparent and polished look.
- The drawing on this paper is well done.
- It has very good bending and cutting ability.
- It is limited in production size compared to hot plates.
The cold plate is divided from several angles and can be divided into different types. There are two general methods for checking all types of cold plates:
- Alloy-based structure
- based on secondary activities
Cold plate based on alloy structure
Certain metal elements are used to make steel plates because steel or iron itself has many disadvantages, for example, they are very unsuitable in terms of corrosion resistance or weldability.
To solve these problems, experts combine the metallic elements of steel and iron with other chemical elements such as manganese, carbon, chromium, silicon, phosphorus, and sulfur, ultimately producing a product with more advantages and fewer disadvantages.
Cold plates are also made of different composite elements depending on their application. In the following, we will examine each type of cold plate with different alloys.
Table ST12
This cold plate is basically a processed version of the hot steel plate, except that the ST12 plate is stronger than the hot-rolled plate. In addition, this sheet is produced with the main element "chromium".
Chromium eliminates many of the shortcomings of steel plates and makes the product a stronger plate.
Table ST13
The panels are sold as cold panels with "normal tensile strength". The basic feature of this plate is that it uses less metal material and therefore has a greater load-bearing capacity.
It should be mentioned that silicon, sulfur, carbon, and phosphor metal elements are used in the production of such plates.
Table ST14
These sheets have super tensile strength; among the alloy cold plate types, ST14 plates are more tensile; it should be mentioned that this paper has very professional applications in various industries.
For example, one of the wide-ranging applications of ST14 sheets is the production of filters for various cars.
Tin plate
Both sides of this cold plate are covered with two layers of tin for good corrosion resistance. Tin plating to increase its electrical resistance is one of the oldest methods of increasing the strength of steel sheets.
hot rolled coil factory in other parts of the world
Many companies are working on steel-related products in their factory in every part of the world. hot rolled and cold rolled coils or in other words, HRC and CRC are the most popular and functional products in the market.
What is the application of a cold plate?
During cold plate production, the thickness of the plate is significantly reduced while the quality is maintained or improved.
The appearance of cold sheets used in the manufacture of equipment is an important factor in industries. Among these industries, we can mention the production of household appliances and the production of car parts.
What are the benefits of the cold plate?
Among the advantages of cold plates, we can mention their high-pressure resistance and proper flexibility. This property has led designers and engineers to use cold plates to build structures where resistance is an important factor.
The high quality and many different colors and sizes mean that these sheets are widely used in all walks of life.
What types of cold plates are there?
The front page is divided into two categories:
Oil boards: Oil boards are called cold boards, the reason for this name is their different appearance. The cold plate production is coated with special oil to prevent rust.
Galvanized sheet: Oiled sheet is used to make the galvanized sheet. The surfaces of these plates are covered with various galvanized coatings. The galvanized coating consists of zinc metal, which increases the plate's corrosion resistance.
Color galvanized sheet: Different colors and techniques are used to process galvanized sheets into color galvanized sheets. Colored galvanized sheets are used in industries such as refrigerators, automobiles, and roofing.
How is the cold rolling process carried out?
If you understand what cold rolled sheets are, you will easily understand the cold rolling process of these types of sheets. After the hot rolling process, the plates produced are sold directly to the market or reserved for the cold rolling process.
The application of cold-rolled sheets in the rolling process is used in automobile manufacturing, home appliance manufacturing, and other industries.
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The cold rolling process involves deoxidizing the sheets produced on the hot rolling line with pickling. Then they reduce the thickness of the plate using tendon rolling frames. For this, they use a stand with four rollers.
The four rollers include two support rollers and two work rollers. The sheet passes directly through the work rollers. The backup rollers are also used to prevent the paper from moving.
7 main sections of the rolled coil.
In the following, you will learn about the 7 main parts of the rolling line in the production of the sheet metal:
- Casting: In the casting phase, ingots are produced. These bars have a thickness of 20 cm and a length of 10 meters.
- Preheating furnace: In the preheating furnace, the ingots produced in the casting stage are heated. The temperature increase in this step is to prevent the shape of the ingot from changing unevenly during hot rolling. In addition, the required force and torque are reduced.
- Hot rolling: Hot rolling is divided into two parts: rough hot rolling and finishing hot rolling. In rough hot rolling, ingots are processed into billets by a universal machine. During fishing, the sheets produced in the drawing phase are processed into thin sheets, which are cut and sent to the market if there is no need for quality improvements. Otherwise, they are converted into large coils and sent to the cold rolling stage.
- Pickling: Pickling of hot-rolled sheets to deoxidize and prevent roll wear.
- Cold rolling: After the pickling stage, the coil enters the cold rolling stage to reduce thickness and improve quality.
- Annealing: During the annealing phase, the plate is heat treated to improve the mechanical properties and produce a homogeneous product.
- Leveling machine: To eliminate unevenness on the surface of the slab, enter the leveling machine.
Galvanized plate
Galvanized sheet is one of the different types of iron sheets where zinc metal forms a strong coating on the surface. Galvanized sheet is used in many situations, including the production of cooler tunnels, plumbing roofs and where water contact and corrosion can occur.
In addition, one of the most common uses of the galvanized sheet is the production of colored galvanized sheet and colored roofing sheets, which are produced and supplied in various colors and sizes.
Advantages of using galvanized sheet
- Lower cost: Compared with other commonly used anti-corrosion methods, the cost of galvanizing is lower, and it is cheaper to use galvanized sheet. It will also cost less to repair and maintain.
- Durability of the coating: The coating formed by galvanization has adequate resistance to mechanical damage, wear and corrosion due to its special metallurgical structure.
- Automatic protection against environmental damage
- Galvanized coating for full protection
china hot rolled coil price today
Galvanized sheet is produced at the factory in two general forms: coil and fabric. The price of the galvanized sheet is different for each manufacturer, and the quality and thickness of the sheet as well as the stock on the market have a great influence on the price.
coloring page
The color iron plate is a kind of galvanized plate because its bottom layer is galvanized, so it is also called a galvanized color plate. The confetti is first baked in the oven.
Galvanized steel has a zinc oxide coating that protects the sheet from environmental influences. Without this zinc coating, the metal could oxidize or rust.
This zinc coating added to the plate makes the galvanized plate resistant to scratches and fingerprints and keeps it from being damaged during shipping and installation of the colored plate, giving you a bright and clean finish.
Color galvanized sheet is also considered a kind of iron sheet, which is widely used in the manufacturing industry of household appliances, construction industry, metal industry, household appliances and transportation industry.
Thin thickness colored galvanized sheet is produced in rolls in standard widths of 100 and 125 cm. those imported from China, produce colored sheets in ice white, blue, pink, burnt brown, red, purple, and orange.
Gabled roof color card
Gabled roof Color Sheets are galvanized sheets with a zinc coating. These sheets are colored in the same way as colored sheets and the main difference from colored sheets is their different shapes and forms.
Sine release plates, clay design plates, hatch plates, trapezoidal plates, and Gabled roof hedge plates are the types of Gabled roof colored plates sold in the Iranian market.
Each Gabled roof-colored sheet has its own unique application depending on its shape, but in general, the main use of these sheets is undoubtedly to cover roofs and walls in sheds, buildings, villas, etc.
These sheets are available in standard thicknesses of 0.50 to 0 .60 mm, and the prices of Gabled roof plates are based on the manufacturer's thickness and type.
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