roof of aluminum

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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).

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Q:Which is better, metal ceiling, galvanized steel sheet and aluminum sheet?
Should aluminum plate, aluminum plate light, corrosion resistance, living room, bedroom or wood profile is better, Ding Mei house ceiling, special guest room, bedroom.
Q:How to prevent corrosion of aluminum sheet surface?
Aluminum does not need to be processed to prevent corrosion, and the formation of dense oxide film with oxygen can prevent corrosion
Q:Everyone said that the pre roll coated aluminum plate, what is pre roll coating?
Beforehand, beforehand, mean,Roll coating is a paint coating process, relative to spraying, such as powder, wall coating, coating or roller coatingThe coating is applied to the surface of the aluminum sheet by a roller or steel roller. Roll coating
Q:What are the commonly used aluminum plates?
According to the content of alloy elements, aluminum plate can be divided into 8 series, namely 1***, 2***, 3***, 4***.5***.6***.7***.8***It can be divided into cold rolling and hot rolling according to different processing technologyAccording to the thickness difference can be divided into thin plate and medium plate,.GB/T3880-2006 standard in the thickness of 0.2 mm, called aluminum foilMore commonly used brands:Pure aluminum foil strip plate. 1060.. tensile plate, tube. Extrusion tube. Type. Great. Cold processing bar mainly for corrosion resistance in forming of high places, but not of high strength components, such as chemical equipment, marine equipment, railway tanker, conductive materials, instruments and meters the electrode material, and so on.
Q:Aluminum foil a pure element?
Aluminum metal (symbol Al, atomic # 13) is an element and therefore a pure substance. That said, if something is made out of aluminum (like aluminum foil) it is rarely pure aluminum and is typically an alloy composed of mostly aluminum with other metals. Alloys are used to improve the properties of the pure substance in various ways depending on the desired use.
Q:If copper wire is expensive, why not use aluminum?
They can be joined but only through a suitable device marked specifically for aluminum to copper connections. See website below.
Q:What are the causes of aluminum plate quenching cracking?
There are no special cracks in the aluminum bars, such as 1 of the heat distortion, 3 of the metallurgical quality, 2 of the solid solution system, the reasonable analysis of the crack location and appearance
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:What is the causes of aluminium discolouration?
Aluminum oxides may appear in different colors depending on hydration states and other variables. Look in a CRC Handbook of Chemistry Physics if available for aluminum compounds and their colors. The colors that you see may also have as much to do with the surface finish as the color of the material on the surface. A microscopically rough surface will appear dark next to a polished surface due to light scattering. I will agree with Ling in principle, but not on details. EDS detection limits on homogeneous samples can be better than 0.1%, although not so good for elements at the light end of the detection range. Current detectors can detect chlorine (a common culprit for aluminum discoloration) at about 0.1%. Your problem with detection and one that Ling has addressed previously may be that a thin film of contamination would not be easily detected by EDS. As Ling suggests, SIMS is a good technique for detecting thin films and low concentrations. The problem with SIMS in this case may be that the detection limits are too good and the technique cannot be quantified. SIMS would detect 2 ppm of chloride and you couldn't tell for sure whether it was 2 ppm, which is probably not an issue here, or 2000 ppm, which would be significant. I would suggest x-ray photoelectron spectroscopy (ESCA or XPS) as an alternative for further study. The technique will analyze thin films (20 A) and detection limits are good enough (about 0.1%). In addition, XPS will give you information about the compounds present, e.g. whether the oxygen is aluminum oxide, aluminum hydroxide, etc. Good Luck.
Q:What bonds can Aluminum make?
Aluminum forms metallic bonds in the metal and aluminum alloys. Aluminum forms covalent bonds as with aluminum isopropoxide. Aluminum forms ionic bonds as in aluminum sulfate. Aluminum chloride is ionic in aqueous solution but molecular in solvents such as benzene.

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