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1. Improve the surface flatness of high quality galvalume steel coating steel coil. After finishing, the flatness of the galvanized aluminum coil is improved, and the wave shape of the galvanized aluminum coil is partially eliminated, and the surface slag particles or other uneven spots can be flattened to make the surface smooth and flat.

2. Adjust the roughness of the surface of the hot sale aluminum zinc steel coil. By controlling the roughness of the surface of the work roll of the finishing machine, the original uneven roughness of the surface of the galvanized aluminum plate can be unified to a certain range. This improves the paintability of the product and the lubricity during processing.

3. Improve the surface color of high quality galvalume steel coating steel coils. For small zinc flower and zinc-free flower products, the galvanized aluminum plate can achieve a more uniform surface with gloss by finishing. For some private enterprises, the use of large zinc flower products as color-coated substrates can make the zinc flower bumps and different glosses formed by the large zinc flower crystals smooth and uniform, which makes the zinc flowers blurred and unfavorable. Cover the zinc flower when painting.

4.Improve the processing of GL Galvalumed coil performance. By finishing, the yielding platform of the galvanized aluminum coil can be eliminated or become inconspicuous, and the metal slip line can be prevented from being generated in the subsequent processing.

With the development of hot rolling technology, the quality of wholesale hot rolled steel coil is continuously improved, and the thickness is gradually thinned. The hot rolled coil is used as raw material to produce hot rolled galvanized coil instead of the traditional single coil galvanizing, which not only broadens the hot rolling galvanizing. The use of the board, but also squeezed the market share of hot-dip galvanized coil with the cold-rolled coil as the substrate. Internationally, many people wholesale hot rolled steel coil.

With the advancement of hot rolling technology, especially the thin slab continuous casting and rolling (CSP) technology, the thickness of wholesale hot rolled steel coil is getting thinner and thinner. In recent years, a number of CSP production lines have been built in China, such as Zhugang, Handan Iron and Steel, Baotou Steel, Tangshan Iron and Steel, etc. Maanshan Iron and Steel Co., Ltd. are currently under construction, and the thinnest rolling specifications can reach 0.8mm. The large number of applications of CSP technology objectively provides thinner hot rolled raw materials with better mechanical properties and specifications for the hot rolled plate.

If you want to wholesale hot rolled coil, please go to our official website to contact customer service staff for help.

Although the history of electroplating has been more than 100 years old, it has been widely used in industrial fields, such as high quality prepainted color galvanized coil, existing galvanized steel coils, etc., which have continued to this day since the 1920s.

In electroplating history, galvanizing was one of the first coatings to be studied. Research work on electro galvanizing began in 1807 to 1827, and in 1829 some people used it on nails. In 1852, the United Kingdom issued the first patent for galvanizing, and in 1855 proposed a patent for silver plating. However, until 1915, tempering galvanizing was only in the real stage before the industry used a zinc sulfate bath. In 1921, the silver galvanizing process invented by Blum made a major breakthrough. Since then, the galvanizing process of smelting has two practical values. The composition and content range of the solution is very similar to the current standard high concentration cyanide galvanizing process.

In the 1930s and 1940s, electroplating workers conducted extensive research on galvanizing. The focus of the study was to improve the glossy appearance of the coating. Furfural, heterocyclic compounds, and sulfides are used as brighteners. In the late 1930s, a bright galvanizing process was introduced to make the galvanization of the sails more perfect and widely used in the production of structural parts. The high quality prepainted color galvanized coil has a wide range of processes, high work efficiency, good dispersion, deep coating, fine crystal structure, beautiful appearance and good corrosion resistance. It has occupied a dominant position in the late 1950s and is still abroad. widely used. According to reports, in the United States in 1975, the amount of sodium sulfate used for galvanizing reached 3 million pounds.

Things always have two sides. Although smelting galvanizing has the above advantages, since sodium is a dangerous drug, with the development of industry, the scale of electroplating is expanding, and oxidized electroplating sewage and exhaust gas cause serious pollution to the human body. The environment has finally caught people's attention. In order to solve the pollution problem of Peihua electroplating, electroplating workers have conducted in-depth and extensive research on the silver-free electroplating process. The human and material resources invested are far more than any period in the past, and academic research and practical problems of solving production are closely combined. Many types of airless galvanizing processes have been proposed to facilitate the development of the entire plating process.

The history of cyanide-free galvanizing is only about 15 years old, and it has been used in industrial production since the early 1960s. According to authoritative sources, before 1964, only 3% of the world's structural parts were galvanized, and by 1974 it had increased to 20%. It can be seen that the development speed is very fast.

No matter what product we use, we must first understand its characteristics and performance in order to use it scientifically and reasonably. The following is mainly about the characteristics and scope of the customized Wave Type Galvanized Corrugated Steel Sheet.

The roof slabs are mainly used for modern industrial buildings, chemical fertilizer plants, sewage treatment plants, electroplating plants, power plants, aquaculture plants, markets, warehouses and other large industrial building roofs and wall new construction and plant renovation projects.

1. Excellent weathering. It has been verified by practice that the products have good weather resistance under various climatic conditions and exhibit good corrosion resistance in chemical corrosion of acid, alkali, and salt.
2. Outstanding waterproof performance. The use of waterproof layer in the 15-90 degree slope roof building.
3. Wind and earthquake resistance.

The low cost Galvalume Corrugated Roofing Sheet safety precautions

1. During use, some heat sources and sources of ignition should not be placed next to the color steel plate, and a certain distance should be maintained.

2. If you want to set up the kitchen in the color steel sheet room, you need a temperature insulation layer.

3. Wires and cables should not be traversed from low cost color-coated corrugated roofing sheet. If it is necessary to pass through the protective casing, the socket and switch box should be made of the metal galvanized box and the mounting method.

4. Indoor and outdoor equipped with simple fire-fighting equipment, fire alarms should be installed under conditions to facilitate quick evacuation. 

Therefore, we must pay attention to the quality of the products when buying color steel plates. Do not buy foam color steel plates. Once a fire is formed, it poses a great threat to the safety of people and property. And we must also do fire-fighting measures when living in low cost color-coated corrugated roofing sheet construction, and pay attention to circuit laying.

The water leakage caused by the material characteristics of the color steel sheet roof leakage.

1. The thermal conductivity of the low price color corrugated steel sheet itself is large. When the external temperature changes greatly, the temperature difference varies greatly due to the temperature change, and the color steel plate shrinks and deforms due to the temperature change, resulting in a large displacement at the interface. There is a hidden danger of water leakage.
2. In the steel structure system, due to the temperature change and the external force such as wind load and snow load, the steel structure is prone to elastic deformation, and displacement occurs at the joint to cause water leakage.
3. Special parts, due to the use of different materials, such as the connection between the parapet wall and the gutter, the roof lighting belt and other parts, due to the stress changes are not synchronized, easy to cause hidden water leakage.

Metal buildings account for almost half of the low-rise non-residential buildings, and a large number of these buildings use high quality prepainted color galvanized coil plates for roofs and wallboards. The painted steel sheet is a cost-effective and durable product.

In many applications, proper selection of paint systems (pretreatment, primer and finish) can provide galvanized steel roofs and walls with a service life of 20 years or longer. However, in order to achieve this long service life, China PPGI corrugated roofing sheet factory must also consider many other issues, including the nature of the use environment, the thickness and conditions of galvanized steel sheets, and the coating of coated coils. Process and panel design and rolling process. Construction site problems, such as storage and treatment of rolled sheets, architectural design, installation practice and on-site maintenance, also affect the service life of pre-painted metal building components.

Pre-coated galvanized steel sheets have been successfully used for decades under various climatic conditions on roofs and walls.

The low cost Galvalume Corrugated Roofing Sheet is a carbon steel sheet coated with aluminum-zinc alloy by a continuous hot dip process similar to the galvanizing process. The nominal coating composition is 55% aluminum and 45% zinc. Galvalume combines the excellent barrier corrosion protection of aluminum with the galvanic protection of zinc. The result is a coating that lasts a long time, a coating that provides cut-edge protection along sheared edges, and therefore, a coating that offers excellent protection to the steel sheet. It outlasts a galvanized coating of comparable thickness and offers cut-edge protection that is not available with an aluminum-coated sheet.

Galvalume Steel
Galvalume is recommended when a high level of corrosion resistance is very important: Applications include pre-engineered metal buildings, industrial roofing and siding, air-conditioning equipment, building panels, electrical boxes, farm equipment and machinery, furnace parts, guide rails, heating equipment, and appliances.

Mastering the scientific installation and maintenance methods can effectively extend the service life of high quality color corrugated steel sheet for more than 10 years, which not only reduces the use cost of the plant but also maintains a good corporate image. Specifically, we should start with the following aspects:

1. During the processing and installation of sheets with high quality color-coated corrugated roofing sheet price, it is found that the coating is damaged (when it is not rusted), and it should be repaired in time. When the paint is replenished, the same color steel coil refinishes paint can be brushed or sprayed, and the repair paint is matched to prevent rust and corrosion caused by the damage of the coating. After the installation is completed, use a dry rag or another soft tool to clean off the iron filings attached to the surface of the color steel plate by the cutting saw and the electric drill to prevent the occurrence of floating rust.

2. Color corrugated steel sheet, it is recommended that users check and maintain once a year. Iron filings, copper scraps, industrial dust, metal particles, stagnant water, and other long-term residual roof tiles can easily accelerate the corrosion of the coating. If found, the user should organize the cleaning, cleaning, and removal in time. If the coating is found to have rust spots, it needs to be sanded. Before the touch-up, you must remove the grinding powder and rust spots. Apply anti-rust primer in a clean and dry state, and then apply a special repair finish for steel coil of a certain thickness.

1. Elimination and cleaning: Remove the existing materials from the interface between the Wave Type Galvanized Corrugated Steel Sheet and the wall. For the part of the local anti-rust paint, remove the parts and clean the joint sealant.
2. Base layer cleaning: large surface cleaning of floating ash, galvanized steel plate partial rust removal and grinding.
3. Sealing treatment: the seam of the gusset plate and the joint of the wall structure are re-sealed and sealed, and the waterproof plugging is used to repair and wipe the arc.
4. Base primer: Use a flexible waterproof coating to base the Wave Type Galvanized Corrugated Steel Sheet and thinly coat it one or two times.

Installation
The surface of the China color-coated corrugated roofing sheet must not allow metal chips, cuttings, chips and other metal objects such as rivets and fasteners to remain, because the metal residue will cause rust after being eroded. Once discovered, these residues should be removed immediately from the roof or at least after the end of each day of construction. Avoid walking on it to avoid damaging the paint film. In the case of strict requirements, the building shall be inspected within 2 weeks of installation to remove residual substances that may rust. Removing the residue at this point will help the roof look long.

Release film
A portion of the PPGI corrugated roofing sheet for sale is coated with a specially designed transparent organic film. The organic film can protect the corrugated roofing sheet coating from scratches during storage and transportation, but it needs to be removed immediately after the installation. The sunlight will enhance the adhesion of the organic film and the surface of the corrugated roofing plate. Therefore, it is necessary to cover the surface of the color plate to avoid direct sunlight.

If China Galvanized Steel Roofing Sheet for sale is used for too long or not used for a long time, it may age. Why do you say that long-term construction or storage must be exposed to the sun? After a long period of exposure to light, aging will occur, which we can't avoid, but we can prevent the speed of aging in advance, so what should we do?

The first necessary condition for the aging or photochemical reaction of the color-coated plate is that the surface component of the low price color corrugated steel sheet can absorb the radiant energy; secondly, when the radiant energy absorbed by the molecule is greater than the molecular bond energy, the coating of the color-coated plate can be degraded. The shorter the wavelength of the light, the higher the energy it contains.

According to the above theory, the aging of the low price color corrugated steel sheet in the atmospheric environment is that the coating molecule absorbs energy in the ultraviolet light band of the solar light higher than its molecular bond energy, resulting in degradation of the coating molecule. As the coating film ages, the base body gradually loses, and the surface of the coating gradually becomes rough and loses light. This loss of the binder ultimately leaves relatively stable pigment particles which remain as unbonded powder on the surface of the coating film, a process known as pulverization.

In summary, polyester coatings with different coating thicknesses have great differences in aging resistance, thin coatings have poor aging resistance, and normal aging coatings have relatively good aging resistance.

Therefore, the method of reducing the production cost of the color-coated plate by reducing the coating is not feasible, which will inevitably bring serious quality problems. At the same time, it also demonstrates from the side that the coating thickness of the foreign cheap color corrugated steel sheet in stock importer clearly indicates the coating thickness.