Difference Between Hot Rolled And Cold Rolled Steel Coil

The steel plate is divided into wholesale hot rolled steel coil and high quality cold rolled steel coil china. The difference between the two is still very large. Let’s talk about this issue below.

Hot Rolled Steel Sheet

By definition, steel ingots or billets are difficult to deform at normal temperature and are difficult to process. Generally, they are heated to 1100 to 1250 ° C for rolling. This rolling process is called hot rolling. The wholesale hot rolled steel coil has a high temperature, so the deformation resistance is small, and a large amount of deformation can be achieved. Taking the rolling of the steel sheet as an example, the thickness of the continuous casting blank is about 230 mm, and after rough rolling and finish rolling, the final thickness is 1 to 20 mm. At the same time, due to the small width-to-thickness ratio of the steel plate, the dimensional accuracy requirement is relatively low, and the shape problem is not easy to occur, and the convexity is mainly controlled. For the requirements of the organization, it is generally achieved by controlled rolling and controlled cooling, that is, controlling the rolling temperature, finish rolling temperature and crimping temperature of the finishing rolling to control the microstructure and mechanical properties of the strip.

Production Process

Type use
1. Structural steel
Mainly used in the production of steel structural parts, bridges, ships and vehicles.
2. Weather resistant steel
Special elements (P, Cu, C, etc.) are added, which have good corrosion resistance and atmospheric corrosion resistance, are used in the production of containers and special vehicles, and are also used in building structures.
3. Steel for automobile structure
High-strength steel sheet with good stamping performance and welding performance for automotive FRAME, WHEEL and other production.
4. Wholesale hot rolled steel coil
Carbon steel, alloy steel and tool steel for general mechanical structures are used in the production of various mechanical parts after heat treatment.
5. Cold rolled original board
Used in the production of a variety of cold rolled products, including CR, GI, color coated panels.

6. Steel plate for steel pipe
It has good processing performance and compressive strength and is used to produce high pressure gas pressure vessels filled with LPG, acetylene gas and various gases below 500L.
7. Steel plate for high pressure vessels
It has good processing performance and compressive strength and is used to produce hih pressure gas pressure vessels filled with LPG, acetylene gas and various gases below 500L.
8. Stainless steel plate
Stainless steel has good corrosion resistance and is mainly used in the food industry, surgical equipment, aerospace, petroleum, chemical and other industries.

If you are interested in rolled hard roll steel coil factory price and high quality cold rolled steel coil china, China galvanized steel coil supplier welcome to inquiry for free.

Elevator PPGI Galvanized Steel Coil Advantages

At the end of 2012, Hengze PPGI prepainted galvanized steel coil coating business division successfully developed xizi Otis and Chongqing Otis elevator rolls, and the stable supply of nearly 10,000 tons within a year, becoming the largest elevator rolls supplier of Otis. In September 2013, signed the first batch of elevator volume orders with Tianjin Otis, and mass produced the products on a monthly basis. Shanghai Otis has also carried out close cooperation with Hengze color coating business department since 2013. In recent years, in addition to Otis, constant ze in the elevator industry also has an in-depth cooperation with many well-known brands at home and abroad, including deo elevator, Suzhou, matt yunda Toshiba, Guangzhou, Shenyang, Shanghai Fuji, etc., some of the elevator factory orders are already on a monthly production, some elevator manufacturers also have entered the stage of batch manufacture. Hengze is looking forward to cooperating with more elevator industry leaders in the future to jointly promote the new environment-friendly material -- high quality PPGI prepainted galvanized steel coil in the elevator.
Compared with cold-rolled powder spraying roll (after spraying roll), the advantages of PPGI prepainted galvanized steel coil (pre-spraying roll) lie in the following five points:
1. Environment-friendly processing:
The national requirements for environmental protection are more and more strict, after the powder spraying process is replaced by the color coating process is the trend, change to the color coating coil can eliminate the powder spraying produced by the exhaust gas, wastewater, and even completely abandon the powder spraying line, and Hengze elevator with PPGI prepainted galvanized steel coil has passed the environmental ROHS verification, is a real green environmental protection product.
2. Production capacity is effectively released:
Because the elevator is sent to the processing workshop for the flat, cut size coil, so the post-processing process is omitted, can be directly bent, assembled as a finished door or cage coil, capacity can be greatly increased.

3. Better anti-corrosion durability:
Traditional cold rolling powder spray roll is single-layer spraying, easy to corrosion and cracking; The PPGI prepainted galvanized steel coil is multi-layer coating high-temperature curing, the surface adhesion is stronger, the durability is more superior, the use of many years will not appear shell, crack, peeling powder roll easy to appear defects.
4. More uniform coating thickness:
After the coating roll surface uneven, uneven thickness, PPGI prepainted galvanized steel coil can be strictly controlled according to customer requirements, the back film thickness, and coating density is better.
5. The protective film fits more tightly:
Due to the graininess of the surface, the protective film cannot fit tightly on the roll, which is prone to blister, wrinkle, and other defects. In the process of assembling the elevator, the protective film is easy to break and fall off, so the purpose of protecting the roll cannot be achieved. Hengze elevator with low cost PPGI prepainted galvanized steel coil has a mirror coating effect, added to the PPGI prepainted galvanized steel coil production process to make the protective film closer to the roll, not only will not affect the bending and other processing processes, but also can protect the roll from damage in the process of processing and assembly.
Service and outlook:
With the increasingly strict environmental protection requirements in China, it is becoming more and more obvious to develop and replace the environmentally harmful coating technology elevator roll with the environmentally harmless coating technology elevator roll. In order to keep pace with The Times, the business department of hengze cheap PPGI prepainted galvanized steel coils has developed and improved new functions of elevator rolls, forming a series of specifications and varieties of elevator rolls from practical type to European standard high-grade environmental protection type, which can meet the needs of different customers.

Hengze prepainted color galvanized coil classification

The painted board has the advantages of corrosion resistance, aging resistance, convenient processing and forming, bright colors, beautiful appearance, and friendly environment, etc. The variety of painted plates in China prepainted color galvanized coil factory can meet your application requirements in medium and high-grade construction projects such as factory buildings, warehouses, villas, large stadiums, and cultural facilities. According to the requirements of different buildings, masteel can provide you with the different performance of the painted board.

Ordinary polyester (PE)
Ordinary polyester coating color coating board, front coat using ordinary polyester coating, normal conditions of the warranty period of 7-10 years. This product price is moderate, the durability is good, can meet the common building use request.

Polyvinylidene fluoride (PVDF)
PVDF prepainted color galvanized coil in China prepainted color galvanized coil factory facing paint using fluorocarbon resin containing fluorocarbon paint. PVDF as the partial fluorine ethylene polymer has very good stability, corrosion resistance and mechanical performance, under the condition of normal warranty period in more than 20 years, mainly used for high-end building need protection for a long time (such as airport, stadium, etc.), or environmental corrosion serious area of the building (such as the sea, in heavy pollution area or the city center, etc.).

Silicon-to-polyester (SMP)
The front coat of SMP coated board is made of silicon-modified polyester coating, which has excellent hardness, abrasion resistance and heat resistance, higher outdoor durability than ordinary polyester, 10-20 years warranty under normal conditions, and better cost advantage.

High durability polyester (HDP)
The HDP coating is a highly weather resistant polyester coating. Compared with ordinary polyester prepainted color galvanized coil, the price is slightly higher, but the durability of the product, processing and molding excellent, warranty period in more than 15 years, to meet the durability requirements of high-grade buildings.

Characteristic of Color Galvanized Coil

Hot sale prepainted color galvanized coil is a composite material that combines both steel and organic materials. Both the mechanical strength and the easy-to-form properties of the steel sheet, and the organic material are well decorated and corrosion-resistant.

Color galvanized coil structure
The coating type of color steel coil can be divided into polyester (PE), polyvinylidene fluoride (PVDF), high weathering polyester (HDP), clinker sol.

Color steel materials can be divided into five categories: packaging, home appliances, building materials, optical materials, and decorative materials. Among them, the color steel materials of household appliances are the best and the finest, and the production requirements are the highest.

Classification of color coated coils

The hot sale prepainted galvanized steel coil has the advantages of both organic polymer and steel plate, and has good coloring property, moldability, corrosion resistance, decorative property, high strength of steel plate and easy processing property of the organic polymer, and can be easily Perform punching, bending, deep drawing, welding and other processing. This makes the products made of the organic coated steel sheet have excellent practicability, decoration, workability, and durability.

At present, there are more than 600 varieties of color coated coils, but there is still no unified classification method, because it is difficult to find a standard for distinguishing between many varieties, and China prepainted color galvanized coil factory has its own unique Equipment, processes, and a wide range of products. It is only classified according to general habits.

1. According to the processing technology; according to different coating methods, there are roll coating method, a spray method, powder method, laminating method, printing method and the like to obtain an organic coated steel sheet. According to the different times of coating, there is an organic coated steel plate which is coated by different processes such as one baking, two coatings, three coatings, four coatings, and four baking. Pressing flower or printing processing points: It can also be subdivided into coated steel plates such as wood grain board, marble pattern, nourishing skin pattern, and cement mortar pattern.
2. According to the classification of the substrate used; the substrates commonly used for color coating rolls are: high-quality cold rolled steel coil china, hot-dip galvanized sheets, electro-galvanized sheets, alloyed sheets, galvanized aluminum sheets, chrome-plated sheets, aluminum sheets, and the like.
3. Classification according to the type of coating; usually classified according to the coating used to make the organic coating, there are polyvinyl chloride coated steel, polyester coated steel, acrylic coated steel, fluorocarbon coated steel, silicon polyester coated steel Wait.
4. Classification according to coating properties; according to the performance characteristics of organic coatings, there are high weathering coated sheets, high temperature resistant coated sheets, self-extinguishing coated sheets, sterilized coated sheets, non-stick snow coated sheets, and fingerprint resistant Coated sheets and self-lubricating coated sheets.
5. Classification according to special coatings and uses; such as epoxy-rich zinc coatings, organic coated steel sheets with cold-rolled steel sheets as substrates, surface flocking steel sheets and some special machine-coated multi-layer boards, such as wood film boards, Composite plates, shock plates, etc.