What is the difference between T5 and T6 of the aluminum sheet?

What is the difference between T5 and T6 of the aluminum sheet?

The 6000 series aluminum sheet is Al-Mg-Si alloy, and its representative grades are 6061, 6063 and 6082. Different from the other 7000 series aluminum sheet, the main state of 6000 series aluminum sheet is the T state, and the most is the T5 and T6 in the state of two. What is the difference between T5 and T6?
T5 refers to the aluminum extruded from the extruder after the use of air cooling to reduce the temperature rapidly to achieve the required hardness (8–12 Webster hardness). The T6 state refers to the aluminum sheet extruded from the extruder after cooling the aluminum sheet with water cooling, so that the aluminum sheet to achieve higher hardness requirements (more than 13.5 Webster hardness).
6082 Aluminum Alloy
Air cooling time is relatively long, usually 2-3 days, we call it natural aging. The water cooling time is short, we call it artificial aging. The main difference between T5 and T6 states is strength. The strength of T6 state is higher than that of T5 state, and other properties are similar. In terms of price, because of the difference in the production process, T6 state aluminum per ton price higher than the T5 state 500-1000 yuan.
Aluminum sheet in the production process, because of heating and extrusion, resulting in uneven density between the crystal, the energy can not be fully released, stored in the aluminum sheet, the energy is called internal stress. The production process of some users (such as heating, bending, deep drawing and stretching) will release the internal stress of aluminum sheet, and cause the raised grain and the surface is not equal, so you need to release the internal stress of the aluminum sheet. The process of eliminating the internal stress is very simple, in the aluminum sheet down the assembly line, the factory will add a process. With the machine to do a stretch of aluminum sheet, you can release the energy inside the aluminum sheet. Elimination of internal stress of the aluminum sheet with digital Tx51, such as: 6061T651, 6082T651, etc.