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Several Factors Affecting The Quality Of Aluminum Coils
Nov 07, 2020

1. Alloying elements

6063 alloy is an alloy prepared with aluminum, magnesium, and silicon as the main elements. Each element has a certain range of content, and the price of magnesium is high. In order to reduce costs, some manufacturers reduce the amount of magnesium to as little as the allowable content. Some worse, the magnesium content is lower than the allowable low content. Some factories add waste wires and waste aluminum pots to the alloy, basically not talking about 6063 alloy. As a result, the mechanical strength of the aluminum profile is very low, it can be so low that it can be easily bent with both hands, and it is commonly known as soft as noodles. This is one of the reasons why aluminum can be thousands of dollars cheaper.

2. Aluminum alloy melting furnace

How to melt the prepared 6063 alloy and what kind of furnace is used are also crucial. Now domestic furnaces are used at the level of the 1940s and 90s. The poor manufacturers use the original crucible boiler. There are coal-burning, oil-burning, gas-burning and electric heating smelting furnaces. Some stoves have chimneys, and some have no chimneys. Generally, square furnaces (rectangular furnaces) are generally used, and the advanced ones are circular furnaces. Some circular furnaces can tilt the molten aluminum. There are one, two, five, ten, twenty-five, and fifty-ton aluminum melting furnaces in terms of tonnage. More advanced, add a static furnace under the aluminum melting furnace. The static furnace is mainly used for preparing 6063 alloy. The furnace can be used for slagging and degassing, standing, and then casting aluminum rods and aluminum ceilings for extrusion use. The quality of the alloy prepared in the original coal-fired furnace and the modern round furnace is absolutely different. Generally, furnaces should have a chimney no matter what fuel is burned. Most of the waste gas and slag generated during the combustion of the fuel can be discharged from the chimney. If all the flue gas and waste slag are melted in the aluminum water, so that the aluminum rod for extrusion is cast, there are serious slag bubbles inside, which is one of the reasons for the poor quality of aluminum and one of the reasons for the cheap aluminum price. Color coated aluminum coil

3. Alloy casting

The level of domestic casting equipment is also very different. The older domestic casting equipment includes iron mold casting at the level of the 1940s, and the advanced hydraulic semi-continuous casting. The crystalline structure of iron mold casting rods is very poor, and there are a lot of slag and bubbles in the rods. The quality of the rods is very poor. Nowadays, horizontal casting (also called continuous casting) and semi-continuous casting are more commonly used in general factories. , Semi-continuous casting most of the wire rope transmission, good hydraulic transmission. The length of semi-continuous casting rods varies, generally from 3 meters, 4 meters to 8 meters. Semi-continuous casting is a pit type, where it is lowered while casting, and is cooled with cold water on all sides. Due to the uniform water cooling, the crystal structure of the cast rod is uniform and fine. However, the downward transmission of the steel wire rope is not as stable as the hydraulic transmission. The surface of the hydraulic casting rod is smoother than other casting rods. The smooth surface of the cast rod is one of the prerequisites for extruding a good profile. The surface of the cast rods cast by other methods is relatively rough. In order to ensure the quality of the profile, sometimes the cast rods are cut first to remove the rough appearance of the cast rods. The commonly used semi-continuous casting molds are advanced, hot-top-level casting molds. The characteristics of this casting mold can cast several to dozens at a time. At the same time, the casting quality is good, and there are high-quality 6063 aluminum alloy casting rods. In order to be able to produce good aluminum profiles, if it is impossible to cast good cast rods with the original old casting equipment, it is impossible to produce good aluminum profiles at all. There are many aluminum factories in China that do not have the equipment to produce aluminum rods. Instead, they purchase 6063 alloy rods from electric aluminum factories or other factories. In such aluminum factories, the quality of aluminum is in the hands of the casting rod factory, and the aluminum produced It is difficult to achieve stable quality. Compared with advanced casting equipment, the use of backward equipment is that the investment is small and the production cost is low. This is one of the reasons why the sales price difference of aluminum is large. Coated aluminum coil

4. Profile extrusion

There are many types of profile extruders in my country, and the grades are very different. There are factories’ own simple extruders, modified by plastic extrusion machines, and a small number of domestic ones, followed by most of them from Taiwan, Guizi, the United States and Germany, and hydraulic and hydraulic. In short, hundreds of domestic extrusion presses are diverse. It is generally believed that Guizi, the United States, and Germany are better, followed by Taiwan. Good and bad extruders, the same cast rods, the quality of extruded profiles is never different. We often see 6063T5 used for building aluminum doors and windows, which is an American brand internationally used.

I believe that after reading the above explanation, everyone must have a certain understanding of the major factors that affect aluminum coils. I hope everyone will take these factors into consideration when choosing aluminum coils in the future.

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