7020 aluminum tube used for pantograph

7020 aluminum alloy belongs to medium high strength Al Zn Mg alloy, which has high strength, good welding performance and process performance. It is the main welding structural material for aerospace, ground vehicles and equipment. It is widely used to manufacture the body of high-speed train. 7020 aluminum alloy has good comprehensive properties after heat treatment. The strength of 7020 aluminum alloy is greater than 6082, but its forming ability also deteriorates accordingly.

7020 aluminum tube used for pantograph

7020 aluminum tube used for pantograph is an ideal lightweight material used in pantograph of rail vehicle because of its excellent properties such as light weight, high strength, good thermal conductivity, easy formability and good welding performance. As the power receiving device of rail transit vehicles, pantograph undertakes the interface between catenary and on-board electrical equipment. The pantograph on the high-speed railway is generally welded with 7020 T6 aluminum alloy circular tube. Our company can directly make 7020 aluminum tube used for pantograph, which can avoid the cracking problem of welding.

1) Aging temperature is the most important factor affecting conductivity, and solid solution temperature is the most important factor affecting hardness value.

2) 7020 aluminum tube used for pantograph in the under aging stage, there is a positive correlation between hardness and conductivity, that is, there is the same change trend; In the over aging stage, there is a negative correlation between hardness and conductivity, that is, the change trend is opposite.

3) Considering the actual situation in production, 470 ℃ is adopted × 1 h + 165 ℃ × 6 h heat treatment system, conductivity ＞ 22.68 MS / m, hardness ＞ 137 HV.