[China Aluminum Network] 7 series aluminum alloy is another commonly used alloy, a wide variety. It contains zinc and magnesium. The more common aluminum alloy with good strength is the 7075 alloy, but it can not be welded, and its corrosion resistance is quite poor. Many CNC cutting parts are made of 7075 alloy. Zinc is the main alloying element in this series, plus a little magnesium alloy allows the material to be heat-treated to very high strength properties. This series of materials are generally added a small amount of copper, chromium and other alloys, of which the number 7075 aluminum alloy is particularly top grade, high strength, suitable for aircraft frame and high strength accessories.
The 7-series aluminum alloy belongs to Al-Zn-Mg-Cu super hard aluminum. This alloy was applied to the aircraft manufacturing industry in the late 1940s and is still widely used in the aviation industry. It is characterized by good plasticity after solution treatment, excellent heat treatment strengthening effect, high strength below 150°C, and particularly good low temperature strength; poor welding performance; stress corrosion cracking tendency; required by aluminum or other Use the protection process. Two-stage aging can improve the ability of the alloy to resist stress corrosion cracking. The plasticity in the annealed and as-quenched state is slightly lower than that in the same state 2A12. Slightly better than 7A04, the static fatigue of the sheet, the notch sensitive, the stress corrosion performance is better than 7A04. The density is 2.75
Some enterprises that have lost the international market want to be able to develop after adjusting their export tax rebate policies. They can only begin to study high-value-added products and strive to move toward deep processing. The development of enterprises must be based on sound technologies. Therefore, from the perspective of the overall development of the industry, export tax rebates are conducive to the overall transformation and upgrading of the industry.
7075 aluminum alloy sheet aluminum companies need to use technology to win the adjustment of export aluminum export tax rebate, the purpose is to encourage enterprises to invest in high-tech, high value-added products, make full use of the country's natural resources, rather than the immediate interests of sacrifice Natural resources, to seize the international market in a low-cost way, this is of no benefit to the development of the country and the enterprise. The tax rebate for aluminum profiles is reduced to “zeroâ€, which is to allow companies to adjust their development ideas, so that they can use resources reasonably and control them efficiently. Pollution to guide production. This also requires aluminum profile companies, focusing on R&D, and winning markets with technology.
Under the slogan of advocating green environmental protection, the development of aluminum materials must also comply with this theme. At the same time, it must ensure quality and improve technology in an all-round way. This will enable the entire aluminum market to move toward a brighter future.
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