[China Aluminium Network] China Nonferrous Metals Industry Association organized an expert in Meishan, Sichuan Province to appraise the scientific and technological achievements of the project "Direct Production of High Quality Aluminum and Aluminum Alloy Flat Bars from Electrolytic Aluminum Fluid." Experts at the meeting listened to the report of the research group, reviewed the appraisal materials, conducted questioning and on-the-spot investigations. After careful discussion, experts believed that the electrolytic aluminum solution developed by the project directly produced high-quality 1000 series, 3003, and 5052 aluminum and aluminum alloy ingots. Technology, successfully applied in the Venus project, is a domestic leader, among which PS1050 and 5052 alloy slabs are the first in China.
Electrolytic aluminum liquid directly produces high-quality aluminum and aluminum alloy flat slab project development technical characteristics and innovations:
1. The aluminum and aluminum alloy slabs can be manufactured to meet the requirements of users through the use of electrolytic aluminum liquor, rational addition of ingredients, intensified slag removal in the furnace, online refinement, on-line double-stage degassing and double-stage filtration.
2. After the electrolytic aluminum liquid has undergone a selective graining process, the primary crystal grains of the slab ingot can be cast.
3. Developed the first 35T inner-conduction hydraulic casting machine in China. The flatness of the slab produced does not exceed 4mm; it can completely replace imported equipment and reach domestic leading level.
4. The self-developed alkali metal such as Na in the electrolytic aluminum liquid is not only laid a good foundation for the production of Al-Mg alloy flat slabs, but also reduces the environmental pollution caused by traditional processes.
The quality standard of aluminum alloy flat bars usually has a clear requirement on the internal structure, chemical composition, surface quality, and size of aluminum alloy flat bars, especially in terms of grain size, porosity, inclusions, cracks, hydrogen content, etc. The requirements are more stringent. Take Southwest Aluminum as an example. They demand:
(1) Chemical composition: It meets the requirements of its internal standard YF209-2004.
(2) Internal organization: The grain size is not greater than 2; there are no defects such as cracks, pores, and inclusions.
(3) Hydrogen content: not more than 118ml
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