Aluminum T6 vs T651 How defferent between them？

2000 series, 6000 series, 7000 series can be heat treatment to increase the strength of aluminum alloy.In fact, we often encounter 6061 t6, 6061 t651 aluminum plates, and 7075 T6 and 7075 T651 aluminum plates. What is the difference between T6 and T651

Aluminum T6 vs T651 How defferent between them？

T6: Solution treatment + artificial aging
T651: Solution treatment + artificial aging + stretched for stress relife.

What is tress or so call internal stress？

Aluminum plate in the production process, because of heat and extrusion, resulting in uneven density between the crystals, energy can not be fully released, stored in the aluminum plate, this energy is called internal stress. Some users’ production processes (such as heating, bending, cutting, etc.) will release the internal stress of the aluminum plate, resulting in bending, wavy lines, surface inequality, so the internal stress of the aluminum plate needs to be released first.

When T651 aluminum plate be stretched, aluminum plate is shaped and deformed like plastic, grain will tend to be more uniform, the internal stress is released, the residual internal stress is very small.Therefore， it is not easy to deformation when processing.

In general, if there are no precise requirements for dimensional stability and elastic allowance, aluminum alloy T6 is selected;

If the precision workpiece, in order to avoid the processing of elastic recovery and size can not maintain stability, it is necessary to choose T651.