Aluminium for roofing application

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Aluminium alloys with a wide range of properties are used in engineering structures. Alloy systems are classified by a number system (ANSI) or by names indicating their main alloying constituents (DIN and ISO).

The strength and durability of aluminium alloys vary widely, not only as a result of the components of the specific alloy, but also as a result of heat treatments and manufacturing processes. A lack of knowledge of these aspects has from time to time led to improperly designed structures and gained aluminium a bad reputation.

One important structural limitation of aluminium alloys is their fatigue strength. Unlike steels, aluminium alloys have no well-defined fatigue limit, meaning that fatigue failure eventually occurs, under even very small cyclic loadings. This implies that engineers must assess these loads and design for a fixed life rather than an infinite life.

Another important property of aluminium alloys is their sensitivity to heat. Workshop procedures involving heating are complicated by the fact that aluminium, unlike steel, melts without first glowing red. Forming operations where a blow torch is used therefore require some expertise, since no visual signs reveal how close the material is to melting. Aluminium alloys, like all structural alloys, also are subject to internal stresses following heating operations such as welding and casting. The problem with aluminium alloys in this regard is their low melting point, which make them more susceptible to distortions from thermally induced stress relief. Controlled stress relief can be done during manufacturing by heat-treating the parts in an oven, followed by gradual cooling—in effect annealing the stresses.

The low melting point of aluminium alloys has not precluded their use in rocketry; even for use in constructing combustion chambers where gases can reach 3500 K. The Agena upper stage engine used a regeneratively cooled aluminium design for some parts of the nozzle, including the thermally critical throat region.

Another alloy of some value is aluminium bronze (Cu-Al alloy).



Aluminium foil acts as a total barrier to light and oxygen (which cause fats to oxidise or become rancid), odours and flavours, moistness, and germs, it is used broadly in food and pharmaceutical packaging. The purpose of aluminium is to make long-life packs (aseptic processing|aseptic packaging) for drinks and dairy goods, which allows storing without refrigeration. Aluminium foil containers and trays are used to bake pies and to pack takeaway meals, ready snacks and long life pet foods.

Aluminium foil is widely sold into the consumer market, often in rolls of 500 mm (20 in) width and several metres in length.It is used for wrapping food in order to preserve it, for example, when storing leftover food in a refrigerator (where it serves the additional purpose of preventing odour exchange), when taking sandwiches on a journey, or when selling some kinds of take-away or fast food. Tex-Mex restaurants in the United States, for example, typically provide take-away burritos wrapped in aluminium foil.

Aluminium foils thicker than 25 μm (1 mil) are impermeable to oxygen and water. Foils thinner than this become slightly permeable due to minute pinholes caused by the production process.

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Q:what's the oxidation method of positive pole on the surface of aluminum sheet?
Do chemical polishing again, oxidation time is about 40 – 90 minutes, after finishing all of these, you can conduct positive pole oxidation, choose sulfuric acid solution in normal situation, pretreatment is very important in the whole process, take stereo as negative pole, firstly, use the solution mixed of carbonate-bicarbonate and detergent to heat and clean its surface, pretreat the aluminum sheet, dyeing according to requirement after oxidation, then remove the oxide film with oxide film removal solution, place aluminum sheet on the positive pole, finally closing it in the boiling water for about 15 minutes.
Q:identify and clasify the products made from aluminium?
airplanes are made from aluminum. certain beverages are also. aluminum is cheaper and lighter. the biggest problem is the amount of electricity that it takes to make aluminum
Q:how many tons of alumina can yield 1ton of Aluminium?
three tons
Q:The difference between aluminium alloy and aluminium plate
Aluminum alloy low density, but relatively high strength, close to or higher quality steel, plastic good, can be processed into various profiles, with excellent conductivity, thermal conductivity and corrosion resistance, widely used in industry, the use of only steelIn general, outdoor billboards are made of aluminium alloy sheets
Q:Heating aluminum plate, heating scheme, urgent ~!
For aluminum heating silicon heating plate is a good choice. The four corners can be fixed by screws, Beijiao can. Installation is very convenient. I was in the goodway procurement. They are guaranteed for one year.
Q:Where does China make aluminum plate?
In many parts of the country have aluminum factory, the old state-owned enterprises have 101, SWA aluminum plant, located in the southwest, northeast china. The emerging aluminum processing base in Henan, due to resource advantages, the largest aluminum factory, the price is relatively low.
Q:Why is aluminum preferred over iron-based alloys in the aerospace and?
Strength-to-weight ratio.
Q:Can aluminum plate be welded?
Q:a sample of aluminum chloride (AlCI3) has a mass of 37.2 g.?
You have to remember Avogadro's number: 6.02 x 10^23 Read about it in your text book. It is the number of molecules of any atom that make up 1 mole. 1 mole of a molecule is equal to it's atomic weight in grams. So, the atomic weight of aluminum is 26.9. So, 26.9 grams of aluminum contains exactly 6.02 x 10^23 molecules of aluminum (or 1 mole). What's the molecular weight of aluminum chloride? Well, 26.9 + 3(35.5) = 133.4 the 35.5 is the molecular weight of chloride and there are 3 of them. So, 133.4 grams of aluminum chloride would be 6.02 x 10^23 molecules. We only have 37.2 g. 37.2 g/ 133.4 g per mole = 0.279 moles. 0.279 moles x (6.02 x 10^23 molecules/mole) = 1.68 x 10^23 molecules of aluminum chloride. So, since there is one aluminum per molecule, you have your answer. Just multiply by three to find out how many molecules of chloride are present. Finally, if 133.4g = 6.02 x 10^23 molecules, then 1 molecule = 133.4 / 6.02x10^23 = 22.16 x 10^-23 or 2.216 x 10^-22 Make sure that the periodic table you use for class has the same values (some tables are more simplified then others). Also, make sure that you use the correct number of scientific digits when calculating your answer.
Q:aluminium or steel tubing?
You cannot weld steel to aluminum with traditional arc welding techniques. It can only be done with explosion or friction welding. I doubt either of these processes will be utilized on a trike frame as they would be cost prohibitive for low production runs. Are you an experienced aluminum welder, or will you be using one? If not, I'd suggest using steel tubing. Steel is much more forgiving during the welding process. It is stronger too; although on the downside, it is heavier. As for your design, it is very difficult to follow your description without a picture. I would be remiss to suggest something with my current, limited understanding. As far as tubing and solid rod are concerned, for the same weight, the tubing will be stronger because it has its mass located away from the center. This will give it much more structural rigidity to resist bending. Now solid rod of the same diameter is stronger than tube, but very heavy. I would think you should be able to use tubing for everything. Maybe thicker or even larger tubes for the areas of high stress concentration such as the area you ask about. If you go with the aluminum, good luck welding it. While it certainly can be done, it takes a great deal more experienced of a welder to perform this operation successfully.

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