Chinese aluminum alloy manufacturers tell you the basic knowledge of aluminum

1. Natural attributes

Aluminum is a light metal, and its compounds are widely distributed in nature. The content of aluminum in the earth’s crust is about 8% by weight, second only to oxygen and silicon, ranking third. Among metal varieties, it is the second largest metal after steel. Aluminum has special chemical and physical properties and is one of the most commonly used industrial metals today. It is not only light in weight, strong in texture, but also has good ductility, electrical conductivity, thermal conductivity, heat resistance and nuclear radiation resistance. It is an important basic raw material for the development of the national economy.

The specific gravity of aluminum is 2, 7, and the density is about 1/3 of that of ordinary metals. The electrical conductivity of commonly used aluminum wire is about 61% of copper, while the thermal conductivity is only half that of silver. Although pure aluminum is very soft and ductile, it still needs to be cold worked and alloyed to harden it. is an important source of aluminum. It takes about two pounds of bauxite to make one pound of alumina, and two pounds of alumina to make one pound of metallic aluminum.

2. Classification of aluminum varieties

According to the main component content of aluminum ingots, it can be divided into three categories: pure aluminum (aluminum content 99,93%-99,999%), industrial high-purity aluminum (aluminum content 99,85%-99,90%)), industrial Pure aluminum (aluminum content 98,0%-99,7%).

3. Aluminum quality standards

The quality of aluminum ingots must meet the standard GB/1196-1993. Among them, the aluminum content of AL99, 80 and AL99, 70 shall not be less than 99, 80 and 99, 70. According to the standard (GB/T1196-93), it should be called “remelted aluminum ingot”. , But everyone is accustomed to “aluminum ingots.” It is produced by electrolysis using alumina cryolite. After aluminum ingots enter industrial applications, they are mainly divided into two categories: cast aluminum alloys and deformed aluminum alloys. Cast aluminum and aluminum alloy are castings that produce aluminum through casting. Deformed aluminum and aluminum alloys are processed products of aluminum produced by pressure processing:, strips, foils, tubes, rods, profiles, wires and forgings. According to the standard of remelted aluminum ingots, “remelted aluminum ingots are divided into 6 grades based on chemical composition, namely Al99, 85, Al99, 80, Al99, 70, Al99, 60, Al99, 50, Al99, 00” (Note: The number after Al is the aluminum content). At present, some people call it “A00” aluminum, which is actually 99.7% pure aluminum, which is called “standard aluminum” in the London market. As we all know, China’s technical standards in the 1950s came from the former Soviet Union. “A00” is the Russian grade in the Soviet standard. “A” is a Russian letter, not English “A”, nor a Chinese pinyin letter. “One”. In line with international standards, it is more accurate to call “standard aluminum”. Standard aluminum is an aluminum ingot containing 99.7% aluminum registered on the London market.

4. The main purpose of aluminum

In the past 50 years, aluminum has become one of the most widely used metals in the world. In the construction industry, aluminum is widely used due to its stability in the air and its appearance after anodization. alloy materials are also widely used in the aviation and defense and military industries; high-strength steel wires are usually used for power transmission reinforced aluminum cables; in addition, automobile manufacturing, container transportation, daily necessities, household appliances, mechanical equipment, etc. require a large amount of aluminum.

With the rapid development of the national economy, my country has gradually become a “global processing base”, and basic industries such as steel and non-ferrous metals are booming. In recent years, the output of electrolytic aluminum has soared, making China the world’s largest aluminum producer.

At the same time, my country also plays an important role in the global aluminum market. Due to the strong growth of my country’s demand in recent years, changes in China’s supply and demand fundamentals have directly affected the balance of the world’s aluminum market through international trade.

However, there are many uncertainties in my country’s primary aluminum supply. This uncertainty stems from the continued tightening of alumina supply, partly due to power shortages caused by defects in the Chinese system. Due to the limitations of its own resources and the impact of insufficient investment in mining and the development of primary mineral products for a period of time, China has experienced a severe shortage of raw materials. A large amount of alumina needs to be purchased from abroad every year. In 2004, 5.87 million tons were imported.

In addition to the raw material alumina and electricity issues, the government has also begun to impose restrictions on the supply of primary aluminum, which is higher than domestic consumption growth. The purpose is to control the current overheated electrolytic aluminum industry. However, whether it is power shortage or alumina supply, the overall impact on China’s aluminum production is limited.

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