FAQs

FAQ

FREQUENTLY ASKED QUESTIONS

What are the main products of Wanlutong Metal Materials Co., Ltd.?

Our company uses advanced production technology, focusing on various types of copper and aluminum and other nonferrous metals. At present, the company's main products are: aluminum plate, aluminum tube, aluminum rod, aluminum profiles, aluminum ingots, aluminum wire, copper plate, copper strip, copper flat wire, copper rod, copper row, copper tube, copper line, copper wire, zinc, lead, tin, magnesium and other non-ferrous metals. We are following the Chinese “One Belt and One Road” great idea, creating a fine foreign trade industry and establishing a good international image.

Advantages in the use of aluminum profiles?

Corrosion resistance: the density of the aluminum profile is only 2.7g/cm³, which is about the density of steel, copper or brass (7.83g/ cm³, 8.93g/ cm³), and 1/3. In most environmental conditions, including air, water (or brine), petroleum chemistry, and many chemical systems, aluminum exhibits excellent corrosion resistance.

Conductivity: aluminum profile is often selected for its excellent conductivity. On the basis of equal weight, the conductivity of aluminium is nearly twice as high as that of copper.

Thermal conductivity: the thermal conductivity of aluminum alloys is about 50-60% of copper, which is beneficial to the manufacture of heat exchangers, evaporators, heating appliances, cooking utensils, and the cylinder head and radiators of the automobile.

Non-ferromagnetic: aluminum profiles are non-ferromagnetic, an important feature of the electrical and electronic industries. The aluminum profile is not spontaneous combustion, which is important for the application of handling or contact with inflammable and explosive materials.

Machinability: the machinability of aluminum profile is excellent. In all kinds of deformed aluminum alloy and cast aluminum alloy, and in the various states after the output of these alloys, machining characteristics vary considerably, which requires special machine tools or techniques.

Formability: specific tensile strength, yield strength, ductility, and corresponding machining hardening rate govern the change in allowable deformation.

How to identify high quality industrial aluminum profiles?

(1) oxide film thickness - not enough thickness, the aluminum surface is prone to rust and corrosion. National standard construction and industrial aluminum oxide film thickness should not be less than 10um(micron). Some attribute names, addresses, production licenses, certificates industrial aluminum profiles, film thickness of 2 to 4um, some not even films. According to the expert estimate, each decrease of 1um oxide film thickness, can reduce the power consumption per ton of material 150.

(2) chemical composition, with a large amount of waste aluminum, industrial aluminum profile can greatly reduce the cost, but it will lead to unqualified industrial aluminum chemical composition, which seriously endangers safety engineering.

(3) the distribution of the thickness of roughly the same size drawings, as well as the section size, width, center hole, but wall thickness difference is very big, also can be quite different, the weight of the each price also corresponding large gap. In addition, the lower industrial aluminum can reduce some closing time, reduce the consumption of chemical reagents, and reduce the cost, but the corrosion resistance of materials is greatly reduced.

(4) manufacturers -- large aluminum extruders, raw materials, production process standards, strict quality control, higher processing costs than small manufacturers, and the processing fee can vary by 2000-3000/ ton. Reduce 2-3 yuan/kg.

In recent years, with the industrial level, the aluminum industry is becoming more and more popular. The sale also presents diversification, price disparity. Unknown customer, only from the lowest price to select industrial aluminum sales company. This has forced some companies that insist on quality first from lower raw materials and processing costs to ensure sales and market chaos is becoming more apparent.

What is the cause of the surface bond of the board? How to prevent it?

The surface bond of copper strip is a kind of defect of some copper and copper alloy thin strip coil in annealing process, which is the adhesion between the coil layer and the layer.

Causes of surface adhesion:

(1) the surface of the strip is too rough;

(2) the tension is too large and the tension is too tight;

(3) the annealing temperature is too high or the insulation time is too long;

(4) the heating process is not uniform, and the thermal expansion amount between the layer and the layer is different;

(5) the cooling speed is faster in the cooling process, resulting in a different coefficient of contraction between the external and internal volume of the cooling.

(2) and (3) are necessary conditions, and if one of the factors in (4) and (5) exists simultaneously, the adhesion is produced.

Elimination measures:

(1) the tension should be moderate when the volume is taken, especially the last volume before the annealing;

(2) the speed of heating and cooling should be strictly controlled in annealing process;

(3) properly reduce annealing temperature or shorten the heat preservation time;

(4) properly increase the smoothness of roller.

What is the meaning of surface treatment of aluminum profiles?

Aluminum is a light metal with silvery luster, its corrosion resistance has the following two characteristics:

(1) the higher purity, better corrosion resistance, it is well known that the pure aluminium to the air with oxygen, on the surface of aluminum will produce a very thin layer of dense natural oxide film, and faster than other metal oxide film generated more thick, so as to prevent the corrosion of harmful gas and moisture in the air, has played a protective effect.

(2) the corrosion resistance of pure aluminum is good, but the poor mechanical strength, which to a certain extent, restricted the application of aluminum, therefore, adding the right amount of people in the aluminum magnesium, copper, zinc and other metals, made into various types of aluminum alloy, aluminum alloy of high mechanical strength, greatly improve the mechanical strength of aluminium, greatly expand the application range, aluminum alloy has high mechanical strength, but poor corrosion resistance than pure aluminum, so it is possible because of oxidation and corrosion. Which requires protection for powder coating of aluminum profile, aluminum alloy with its proportion of small, easy to machining, mechanical strength, etc for many years, are widely used in building Windows and doors, curtain wall, etc.

After surface treatment, aluminum has high corrosion resistance, colour diversity, good many advantages, such as surface texture with different building exterior wall coating photograph echo, to build the colorful building.

What are your prices?

Our prices are subject to change depending on supply and other market factors. We will send you an updated price list after your company contact us for further information.

Do you have a minimum order quantity?

Yes, we require all international orders to have an ongoing minimum order quantity. If you are looking to resell but in much smaller quantities, we recommend you check out our website.

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