How to control the chemical composition of 6063 aluminum alloy?

- Oct 10, 2018-

1.Mg control range: Mg is a flammable metal, which will burn when 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 avoid the performance of the alloy being out of control. Based on our experience and our ingredients, smelting and testing levels, we will control the fluctuation range of Mg within 0.04%, the T5 profile to 0.47% to 0.50%, and the T6 profile to 0.57% to 0.60%.

2. 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. Since the control Si is 0.09% to 0.13%, the Mg/Si should be controlled between 1.18 and 1.32.

3.6063 aluminum alloy T5 and T6 state profiles chemical composition selection range. To change the alloy composition, for example, if you want to increase the amount of Mg2Si to 0.95%, in order to facilitate the production of T6 profiles, you can move Mg up to about 0.6% along the Si upper and lower limits. At this time, Si is about 0.46%, Si is 0.11%, and Mg/Si is 1.

4. According to our many years of production experience, the amount of Mg2Si in the 6063 aluminum alloy profile 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 to 240 MPa. In this way, the alloy is controlled, not only has good plasticity, is easy to be extruded, has high corrosion resistance and good surface treatment performance, and can save alloying elements. However, special attention should be paid to the strict control of 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 is gray and dull, and Fe also reduces the plasticity and corrosion resistance of the alloy. Practice has proved that it is desirable to control the Fe content in the range of 0.15% to 0.25%.