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What is Material of Galvalume Roofing Sheet

Galvalume Corrugated Roofing Sheet

 

The aluminum-zinc alloy structure of low cost Galvalume Corrugated Roofing Sheet is composed of 55% aluminum, 43.4% zinc and 1.6% silicon solidified at 600℃ at high temperature. The whole structure consists of aluminum-iron-silicon-zinc, forming a dense quaternized crystal, thus forming a strong and effective barrier to prevent corrosion factors from penetrating.

Galvalume Roofing Sheet has the following advantages:

Excellent durability
Excellent thermal reflectivity
Excellent heat resistance
Although the price is more expensive than galvanized board, from life, with higher cost performance.

Galvalume Roofing Sheet is aluminum-silicon alloy coated steel plate, in which the content of aluminum is 90%, silicon 10%. Aluminized steel plate has good heat resistance, heat reflection, and corrosion resistance, and its mechanical and physical properties are better than cold-rolled steel plate. Because of the superior performance of the aluminized steel plate, it has been widely used in our daily products. Such as car muffler, household appliances and so on.

Coating Types of Prepainted Steel Coil

prepainted galvanized steel coil
prepainted galvanized steel coil

Polyester (PE, Polyester)
PE coating has good adhesion to materials, prepainted galvanized steel coil in stock is easy to process and shape, cheap and products, color and gloss options. In the general environment under direct exposure, its corrosion fixed number of year for up to seven to eight years, but in an industrial environment or polluted areas, its service life is relatively lower, but polyester coating with UV resistance and coating resistance to pulverization, not ideal, so the use of the PE coating still need is limited by some, commonly used in air pollution is not serious or were in need of processing products for many times.

Silicone Modified Polyester (SMP)
Because of polyester containing active group – OH / – COOH, extremely easy and other polymer chemical and physical reactions, for improved resistance to sunlight and pulverization of PE, color retention and excellent heat resistance of Silicone resin modified reaction, and degeneration of PE ratio is between 5% – 50%, SMP provides better the durability of the steel, the corrosion life up to lO – 12, of course, its price is more PE is high, but because of the Silicone resin adhesion and processing of material formability is not ideal, therefore the SMP painted steel plate does not apply to the need to repeatedly forming, Most of them are used for roofs and exterior walls of buildings.

Durable polyester (HDP, High durable Polyester)
As for the disadvantages of PE and SMP, HYDRO company (now acquired by BASF) of the UK and BECKER of Sweden developed HDP polyester coating with weather resistance of 60-80% of PVDF coating in early 2000, which is superior to ordinary silicone-modified polyester coating with outdoor weather resistance of 15 years. High weather resistant polyester resin in the synthesis of cyclohexane structure monomer, to achieve the flexibility of the resin, weather resistance, and cost balance, use no aromatic polyol and polyacid to reduce the absorption of UV light resin, achieve the coating high weather resistance. Uv absorbent by China prepainted color galvanized coil factory and steric hindrance amine (HALS) are added to the paint formulation to improve the weathering resistance of the film. High weather resistant polyester coil coatings have been recognized by the foreign market, the cost performance of the coating is very outstanding.

PVDF
Because of PVDF chemical bonds and bonds, there is a strong bond energy, so the coating has good corrosion resistance and color retention, in building steel plate coating industrial belt, it belongs to the most advanced products, and the molecular weight and structure type of key, so in addition to the chemical resistance, mechanical properties, resistance to ultraviolet radiation and heat resistant performance are also very prominent. Under normal circumstances, the corrosion protection life can be as long as 20 to 25 years. In recent years, fluororesin containing trifluoroethylene chloride and vinyl ester monomer copolymerization has become popular in China, which is widely used in building external walls and metal plates. Due to the use of easily hydrolyzed allyl ester monomer and the content of fluorine is about 30% lower than PVDF, so there is a certain gap between its weatherability and PVDF. For the fluorocarbon coating produced by Chinahengzesteel, the PVDF content of the coating is not less than 70% (the other is propylene acid resin).

PPGI Steel Coil for Home Appliances

Hengze has developed a series of color coating board for home appliances and hot film coating board. Choose Hengze home appliances with PPGI prepainted galvanized steel coil, not only can provide you with PPGI prepainted galvanized steel coil factory price, improve your products in quality, price and other aspects of the competitive advantage, at the same time, you also make a positive contribution to environmental protection! Home appliances products: 95% of Japan used home appliances with PPGI prepainted galvanized steel coil, 85% of Europe and the United States for home appliances with the color coated board; In China, the amount of pre-spraying is only 10%. However, with the continuous improvement of energy conservation, environmental protection, and quality demand, the use of PPGI prepainted galvanized steel coil for home appliances in China is increasing year by year.

In 2007, the total consumption of domestic household appliances was 190,000 tons, accounting for 5% of the consumption of painted plates. By 2013, the consumption of PPGI prepainted galvanized steel coil in China’s household appliances industry was about 1.2 million tons, accounting for about 10% of the steel used in household appliances. The compound growth rate of the industry in the next three years will remain between 25% and 30%. Hengze has developed a series of color coating plates for home appliances and hot film coated plates. Choose Hengze home appliances with PPGI prepainted galvanized steel coil, not only for you to save costs, improve your products in quality, price and other aspects of the competitive advantage, at the same time you also make a positive contribution to environmental protection.

Comparison of the process flow between the painted plate and the painted plate
Zinc-plated plate, cold-rolled plate, etc., kaiping, shearing, stamping forming, cleaning, phosphating, spraying, assembly of prepainted galvanized steel coil.

Compared with the traditional post-spraying process, the application advantages of home appliance PPGI prepainted galvanized steel coil are as follows:
Advantage 1: shorten process flow and improve production efficiency.

Advantage 2: reduce environmental pollution, improve social benefits by directly using PPGI prepainted galvanized steel coil, reduce the discharge of pollutants due to cleaning, phosphating, paint spraying, and other processes, reduce environmental pollution, reflect the social responsibility of enterprises.

Advantage 3: cost saving direct use of PPGI prepainted galvanized steel coil, can reduce the cost of equipment and plant investment; Reduce material and labor costs in production; Reduce the cost of pollution control.

Advantage 4: achieve the diversity of product appearance PPGI prepainted galvanized steel coil not only coating color is rich and colorful, but also through laminating, printing and other processes to achieve the diversity of appearance patterns, meet the special personalized design needs of different applications.

Color coated plate sample preparation precautions

The difference in the preparation of the salt spray test chamber samples greatly affected the reproducibility of the test results of the prepainted galvanized steel coil in stock. Therefore, you should pay attention to the correct treatment method, or adopt a processing mode negotiated by both parties to reduce the difference of test results. The main points worth noting are the following two points:

Surface quality: During the sampling or sample preparation process, the coating should be scratched or the surface should have obvious defects, which will affect the test results.

Scratch condition: When the color-coated sample is broken, the selection of the scribing tool, the depth and geometry of the scratch will affect the test results. Therefore, it is especially important to use a special scribing tool.

For the depth of the scratch, the provisions in both standards require that the coating be scratched. Since most of the substrates used in the cheap PPGI prepainted galvanized steel coil is hot-dip galvanized sheet, the galvanized layer can be drawn according to standard requirements without special provisions. However, in the operation, since the scale is not well controlled, it is recommended to adopt a method of negotiating by both parties, and the scratch depth is defined as penetrating the plating layer so that the scribe line is a uniform bright line without burrs to avoid scribe lines. Different conditions have an impact on the consistency of test results.

How to identify the quality of color steel sheet

1: Observe the thickness of the substrate and the thickness of the lamination

The high quality PPGI corrugated roofing sheet is composed of a substrate and a colored peritoneal or plated layer. We must first consider the thickness of the substrate and peritoneal coating. The better color steel plate substrate is 0.02~0.05mm, and the thickness of the lamination or coating is often only 0.15mm. The thickness of the substrate is important because it affects the use of the time of the color steel plate. Some manufacturers of color steel plates often make hands and feet on the substrate and color steel plate coating or lamination. They reduce the thickness of the substrate but increase the thickness of the peritoneum to reduce the production cost of the color-coated corrugated roofing sheet, which greatly reduces the use of color steel plates. Life is up.

2: Observe the outer leakage edge of the color steel plate

When I get a piece of color steel plate, I first observe whether the exposed steel plate such as the cross section of the color steel plate is finely crystallized, whether it is gray, dark and impurities. If the cut surface is crystalline and fine, the quality is superior.

3: Look at the price

Anything is a penny. When we compare the quality of color steel plates, the price is one side, but don’t pay too much attention to high quality color-coated corrugated roofing sheet price. If the price of a color steel plate is much lower than the others, then we have to pay attention to.

4: Listen to the sound

If you use a finger or a hard object to strike the color steel plate, if the material of the color steel plate is poor, the sound emitted is boring, the metal sound is not obvious, and the metal color sound of the better color steel plate is louder and crisper.

5: Check the quality certificate of color steel plate

Is there a test standard for the relevant department? If possible, try to go to the manufacturer of the PPGI corrugated roofing sheet for field visits. Look at the environment of the company, whether it is formal. Inquire about the reputation of this company in the market.

How to judge the quality of color steel coils

The application of the hot sale prepainted color galvanized coil in society has become more and more extensive, and it has occupied an important position in the new buildings that are concerned and accepted by everyone. The question that comes with it is how to find one among the many color steel coils. Excellent color steel coil. Let’s take a look at a few of the techniques for judging color galvanized steel coils.

1. First of all, it is necessary to check the quality of the PPGI steel coil to verify that there is no relevant part of the inspection standard. Before investing, please investigate the company’s reputation and reputation in the market. It is best to go to the manufacturer of the color steel coil to conduct on-the-spot investigations to see if the company’s environmental equipment is formal.

2, just through the price can also know the quality of low cost PPGI prepainted galvanized steel coil products, anything is a penny. When comparing the quality of color steel coils, the price is only one of them, and there is no need to pay too much attention to the price. However, the price of a color steel coil is not much lower than that of other ones. The friend who wants to buy will have to consider it.

3. Observe whether the exposed steel of the color steel coil, such as the section, is crystallized and fine, and there are no ash, darkness, and impurities. If the cut surface is crystalline and fine, the quality is relatively good. Observing the thickness of the base roll and the thickness of the peritoneum, the hot sale prepainted galvanized steel coil is mainly solid enough to have a base roll and a colored peritoneal or plated layer. The better color steel coil base roll is 0.02~0.05mm, and the film or coating thickness is often only 0.15mm. the following. Some manufacturers of color steel coils often use hands and feet on the base roll and color steel coil coating or film to reduce the thickness of the base roll and increase the thickness of the peritoneum to reduce the production cost of the color steel coil, which is greatly reduced. The service life of color steel coils.

4. Use a finger or a hard object to strike the color galvanized coil. The material quality of the color steel coil is relatively loud and crisp. If the material of the color steel coil is poor, the sound will be boring.

High quality galvanized steel coil sheet

The low cost Galvanized Corrugated Steel Sheet is used to prevent corrosion of the surface of the steel sheet and prolong its service life. The surface of the steel sheet is coated with a layer of metal zinc. This zinc-coated steel sheet is called a galvanized sheet. Zinc plating is an economical and effective method of preserving corrosion that is often used. About half of the world’s zinc production is used in this process.

According to production and processing methods can be divided into the following categories:

1. The hot dip galvanized steel coil for sale. The steel sheet is immersed in a molten zinc bath to adhere to a zinc-plated steel sheet to the surface. At present, it is mainly produced by a continuous galvanizing process, that is, a coiled steel plate is continuously immersed in a plating tank in which zinc is melted to form a galvanized steel sheet;

2. Alloyed galvanized steel sheet. This steel sheet is also produced by hot dip, but immediately after it is discharged, it is heated to about 500 ° C to form an alloy film of zinc and iron. This galvanized sheet has good adhesion and weldability of the coating;

3. Electro-galvanized steel plate. The production of such a galvanized steel sheet by electroplating has good processability. However, the coating is thinner and the corrosion resistance is not as good as that of hot-dip galvanized sheet;

4. Single-sided plating and double-sided differential galvanized steel. Single-sided galvanized steel, that is, a product that is only galvanized on one side. It has better adaptability than a double-sided galvanized sheet in welding, painting, anti-rust treatment, and processing. In order to overcome the shortcomings of uncoated zinc on one side, there is a galvanized sheet coated with a thin layer of zinc on the other side, that is, a double-sided differential galvanized sheet;

5. Alloy, composite galvanized steel sheet. It is made of zinc and other metals such as aluminum, lead, zinc, etc., or even composite plated steel. This steel plate has excellent rust resistance and good coating properties;

In addition to the above five types, there are also hot sale color-coated corrugated roofing sheet, printed galvanized steel sheets, and polyvinyl chloride laminated galvanized steel sheets. However, the most commonly used ones are still hot dip galvanized sheets.

Galvanized steel products are mainly used in construction, light industry, automotive, agriculture, animal husbandry, and fishery and commercial industries. The construction industry is mainly used to manufacture anti-corrosion industrial and civil building roof panels, roof grills, etc.; the light industry uses it to manufacture home appliance casings, civil chimneys, kitchen utensils, etc., and the automotive industry is mainly used to manufacture corrosion-resistant parts for cars, etc. Agriculture, animal husbandry and fishery are mainly used for grain storage and transportation, frozen processing tools for meat and aquatic products, etc.; commercial is mainly used as storage, transportation, and packaging equipment for materials.

Common quality problems of galvanized steel coils

1. Defect name: galvanized steel coil – galvanized stripping
Defect performance: dezincification
Cause: Poor furnace temperature, improper handling of the substrate of prepainted galvanized steel coil in stock, etc.

2. Defect name: galvanized steel coil – ungalvanized
Defect performance: the surface of the steel plate is not galvanized
Causes: poor raw materials, poor pre-treatment degreasing, poor furnace temperature

3. Defect name: galvanized steel coil – poor zinc flower
Defect performance: zinc flower size of prepainted galvanized steel coil in stock is uneven, no zinc flower
Cause: poor furnace temperature rise, poor cooling control

4. Defect name: galvanized steel coil – zinc bismuth
Defect performance: spotted on the surface of the coil, attached to the granular zinc residue
Cause: The scum or bottom slag in the zinc pot is attached to the steel strip.

5. Defect name: galvanized steel coil – oxidation
Defect performance: white rust
Cause: During the storage process, it absorbs moisture from the air and oxidizes.

Precautions for roof sheets before construction

Because the high quality PPGI corrugated roofing sheet is a prefabricated dismantling structure, the pre-construction line task plays an infinitely important guarantee for the quality of the previous construction, and it does not ignore it. The construction requirements for roofing roof and glass rock wool are reviewed in the following order.

1. Pre-construction review
Mouth: The construction of the trench is strong and there must be no looseness; all the strips must be parallel to each other, and all the strips are three-dimensional; the strips and the diagonal strips: the strips and the diagonal strips must be pre-tensioned firmly, and the nuts must not be loose.

2. Plate design

Longitudinal plate design
Be the first to confirm the size of the first and last rafts of each sloping roof and the positioning axis, and then confirm the end point of the roof panel, the starting point and the size of the first and last rafters. The distance between the first and last rafters is the total length of the low cost color-coated corrugated roofing sheet. In the center of the lighting belt, according to the request of the drawings, take the lead in affirming the length and length of the lighting belt, and then confirm the length of the color plate; the lap of the lighting belt and the color plate adopts the lighting belt on the upper side and the color plate in the lower form. Apply water-stop glue to ensure waterproof and reliable.

Horizontal panel design
The ineffective coverage of the panels on the roof slab is the fundamental modulus of the roof slabs. The layout of the roof slabs is the size of the total width of the roof and the fundamental amplitude.

The total width of the roof is indeed fixed: the total width of the roof should be the spacing between the axis of the first and last columns of the building plus the structural size of the roof protruding from the first and last columns.

According to the total width of the roof, the horizontal unit of the color plate is planned, and the size of the flood sheet at the gable is planned according to the margin.

According to the design of the row sheet, the position of the starting line of the row sheet is affirmed. In the roof sheet installation, the endpoint is first marked on the purlin, that is, the starting point of the row board is marked on each purlin along the span direction, and the connection and building of each point The longitudinal axis is perpendicular, and then the punctuation is repeated once every ten plates in the amplitude direction of the plate to restrict and review the construction bias of the plate, and then correct.

When the roof panel needs to be longitudinally overlapped, the length of the stacking is guaranteed to be more than 15 cm. The water-stopping glue is applied according to the design drawing, and the grounding position is in the position of the strip.

Transportation precautions for steel plastic geogrid

Steel-plastic geogrid is widely used in engineering and plays an important role. What should you pay attention to when transporting and stacking low cost steel plastic geogrid? Steel plastic geogrid manufacturers will answer you:

Steel plastic geogrid transportation precautions
During transportation, the steel geogrid should be prevented from colliding and the steel geogrid damaged or the plastic geogrid bent. The number of layers of the steel-plastic geogrid should not be too high, and the fulcrum should be set reasonably. The two sides of the steel-plastic geogrid should be supported to prevent rolling. Waterborne steel plastic geogrid should be transported by ship and can be transported by sealing float or other means. When transported by ship, the ship must have sufficient length and stability. The steel geogrid is placed on a semi-circular special bracket and can be fastened with a cable if necessary. When using sealed floating transport, the watertight requirements should be met, and considering the influence of wind and waves, the sealing device should be easy to install and disassemble.

Inspection notice for the steel-plastic grille.
Steel-plastic grid inspection of the plane position, size, base elevation, steel geogrid inspection base geological conditions, and steel-plastic geogrid load is consistent with the design data, steel-plastic geogrid inspection substrate treatment and drainage Whether the situation meets the requirements of this specification, the steel plastic geogrid storage construction site such as the steel plastic geogrid inspection construction record and related test data should be smooth, solid and smooth.

If you are interested in steel geogrid, please come to the website for a free consultation.