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Aluminium Products

How Is the Hardness of Aluminium Pipe Formed?

Why does aluminium pipe with the same appearance has such a big difference in hardness? Is the hardness of aluminium directly related to its quality? In fact, the hardness of aluminium tubes is already different during the production process. There are many factors that affect the hardness of aluminium pipe in the production process. Let's take a look at how the production environment temperature affects the hardness of aluminium tubes.

Different temperatures of aluminium pipe produce products with different hardness

After the aluminium tube is extruded and passed through the cold bed, it enters the artificial aging furnace for artificial aging treatment, with the goal of meeting the aging treatment of the aluminium tube and obtaining better hardness. Aluminium profiles are divided according to the material into al6063 and al6061 aluminium alloys, and the hardness requirements after aging are 9 to 12 degrees and 15 to 17 degrees, respectively. However, if the temperature is not well controlled during the extrusion process, or if the aging time is incorrect, it will cause problems of insufficient hardness or excessive aging. There are three kinds of temperature that have a great impact on the hardness of aluminium tube forming, one is the temperature of the extrusion tube, that is, the temperature of the extrusion die, and the other is the temperature of the aging furnace. the temperature of aluminium profiles must be controlled at no less than 490 degrees. Otherwise, the temperature is too low, and after the first cooling, the ideal hardness will not be achieved, and it is difficult to achieve it even during artificial aging.

When manufacturing 6061, the temperature of the aging furnace should be controlled at 175 degrees, and 6063 should be controlled at 185 degrees. The aging time of 6061 is 6 hours, and the aging time of 6063 is 4 to 5 hours, so that the aluminium tube can reach the ideal hardness after aging. If the aging time is too long, it may cause the aluminium profile to anneal and may cause the entire batch of aluminium to become waste. In the aging process, attention should be paid to the flow distribution of the fan, and the aluminium alloy should be placed evenly to avoid uneven hardness after aging.

Application of aluminium pipe

Aluminium tubes are used in various industries and hobbies, in various DIY projects, manufacturing, and construction fields. In addition, it is also widely used in the aerospace industry. A good example is the 6061-t6 aluminium pipe, which is widely used in the aerospace industry due to its high strength, good weldability, and easy processing. Most aluminium tubes of all types of welding can be brazed and welded. For various reasons, aluminium and aluminium alloys are the most commonly used metals in the aerospace industry. Its low cost, light weight, and good processing performance are the main reasons for its wide application.

Aluminium has excellent physical properties such as spark-free, non-magnetic, non-electrical, non-conductive, and strong chemical resistance. In addition to the aircraft industry, it is also popular in building and maritime applications because it is easy to manufacture, non-toxic, and has strength and corrosion resistance for industrial and marine environments. Anodized aluminium can improve its corrosion resistance and obtain rainbow gloss in various colors. Since some alloys have slight corrosiveness, covering the alloy surface with a thin layer of aluminium to provide additional protection is required.

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