6063 aluminum is widely used in the framework of building aluminum doors, windows and curtain walls.
In order to ensure that doors, windows and curtain walls have high wind pressure resistance, assembly performance, corrosion resistance and decoration performance, the requirements for the comprehensive performance of aluminum alloy profiles are much higher than those in industry Profile standards.
Within the composition range of 6063 aluminum material specified in the national standard GB/T3190, different values of the chemical composition will result in different material characteristics. When the chemical composition has a large range, the performance difference will fluctuate in a large range. , So that the comprehensive performance of the profile will be out of control.
The chemical composition of 6063 aluminum has become the most important part of the production of high-quality aluminum alloy building profiles.
7009 aluminum alloy, American deformed aluminum and aluminum alloy. Aluminum alloys are divided into two categories: cast aluminum alloys, which are used in the as-cast state; deformed aluminum alloys, which can withstand pressure processing and have higher mechanical properties than the as-cast state. It can be processed into various shapes and specifications of aluminum alloy materials. Mainly used in the manufacture of aviation equipment, daily necessities, construction doors and windows, etc.
6063 is a representative alloy for extrusion. Its strength is lower than that of 6061. It has good extrudability and can be used as a shape with complex cross-sections. It has good corrosion resistance and surface treatment.
It is a low-alloyed Al-Mg-Si series high plastic alloy. Has many valuable features:
– Strengthened by heat treatment, high impact toughness, insensitive to imperfections. – With good thermoplasticity, it can be extruded at high speed into complex, thin-walled, hollow profiles or forgings with complex structures. The quenching temperature range is wide, and the quenching sensitivity is low.
After extrusion and forging demoulding, as long as The temperature is higher than the quenching temperature. It can be quenched by spraying or penetrating water. Thin-walled parts (6 less than 3mm) can also be wind quenched. – Excellent welding performance and corrosion resistance, no stress corrosion cracking tendency. Among the heat-treatable aluminum alloys, the Al-Mg-Si series alloy is an alloy in which no stress corrosion cracking phenomenon has been found in 6063. – After processing, the surface is very smooth and easy to anodize and color. The disadvantage is that if it is left at room temperature for a period of time after quenching, the strength will be adversely affected (parking effect).
The Control Range Of Aluminum 6063
- 3.1 The control range of Mg Mg is a flammable metal, which will be burnt during smelting operation. When determining the control range of Mg, the error caused by burning should be considered, but it should not be too wide to prevent the alloy performance from getting out of control. Based on experience and the level of our factory’s ingredients, smelting and laboratory tests, we have controlled the fluctuation range of Mg within 0.04%, the T5 profile is 0.47% to 0.50%, and the T6 profile is 0.57% to 0.50%. 60%.
- 3.2 The control range of Si When the range of Mg is determined, the control range of Si can be determined by the ratio of Mg/Si. Because the factory controls Si from 0.09% to 0.13%, Mg/Si should be controlled between 1.18 and 1.32.
- 3. The selection range of the chemical composition of the 36063 aluminum alloy T5 and T6 state profiles. If you want to change the alloy composition, for example, if you want to increase the amount of Mg2Si to 0.95%, so as to facilitate the production of T6 profiles, you can move Mg up to a position of about 0.6% along the upper and lower limits of Si. At this time, Si is about 0.46%, Si is 0.11%, and Mg/Si is 1.
- 3.4 Concluding remarks According to our factory’s experience, the amount of Mg2Si in 6063 aluminum alloy profiles is controlled within the range of 0.75% to 0.80%, which can fully meet the requirements of mechanical properties. In the case of a normal extrusion coefficient (greater than or equal to 30), the tensile strength of the profile is in the range of 200-240 MPa. However, controlling the alloy in this way not only has good plasticity, easy extrusion, high corrosion resistance and good surface treatment performance, but also saves alloying elements. However, special attention should be paid to strictly control the impurity Fe. If the Fe content is too high, the extrusion force will increase, the surface quality of the extruded material will deteriorate, the anodic oxidation color difference will increase, the color will be dark and dull, and Fe will also reduce the plasticity and corrosion resistance of the alloy. Practice has proved that it is ideal to control the Fe content within the range of 0.15% to 0.25%.
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Source: @cyanbat Author: cyanbat
