Preparation process of Al-Zn-Mg alloy profile for high-speed train body

[0024] A preparation process for an Al-Zn-Mg alloy profile for a high-speed EMU car body, comprising the following steps:

[0025] (1) Extrusion: The mass percentage composition of each component with a length of 700mm includes: Mg: 0.8%, Zn: 3.0%, Si≤0.4%, Fe≤0.5%, Mn≤0.30%, Zr≤0.20%, Cr ≤ 0.20%, Cu ≤ 0.20%, Ti ≤ 0.05%, V ≤ 0.03%, Al-Zn-Mg alloy ingot with the balance of Al, heated in a heating furnace, Al-Zn-Mg alloy ingot is heated The heating temperature in the furnace is controlled at 400°C, and the temperature of the head of the Al-Zn-Mg alloy ingot is 2°C higher than that of the tail, and then it is extruded on the line, and the extrusion speed is controlled at 0.2m / min;

[0026] (2) Roller bottom continuous solution quenching: Put the Al-Zn-Mg alloy profile in step (1) into the roller hearth furnace, hold the temperature at 400°C, and the heat preservation accuracy is ±3°C, then perform continuous quenching, the quenching pressure 3.0bar, the quenching method is water...

[0032] A preparation process for an Al-Zn-Mg alloy profile for a high-speed EMU car body, comprising the following steps:

[0033] (1) Extrusion: The mass percentage composition of each component with a length of 1800mm includes: Mg: 2.2%, Zn: 6.0%, Si≤0.4%, Fe≤0.5%, Mn≤0.30%, Zr≤0.20%, The Al-Zn-Mg alloy ingot with Cr≤0.20% and the balance of Al is heated in a heating furnace. The heating temperature of the Al-Zn-Mg alloy ingot in the heating furnace is controlled at 510 ° C, and the Al-Zn -The temperature at the head of the Mg alloy ingot is 60°C higher than the temperature at the tail, and then it is extruded on the line, and the extrusion speed is controlled at 2.0m / min;

[0034] (2) Roller bottom continuous solution quenching: Put the Al-Zn-Mg alloy profile in step (1) into the roller hearth furnace, hold the temperature at 480°C, and the heat preservation accuracy is ±3°C, then perform continuous quenching, the quenching pressure It is 6.0bar, and the quenching method i...

[0040] A preparation process for an Al-Zn-Mg alloy profile for a high-speed EMU car body, comprising the following steps:

[0041] (1) Extrusion: The mass percentage composition of each component with a length of 800mm includes: Mg: 1.2%, Zn: 4.0%, Si≤0.4%, Fe≤0.5%, Zr≤0.20%, Cr≤0.20% , V ≤ 0.03%, Al-Zn-Mg alloy ingot with the balance of Al, heated in a heating furnace, the heating temperature of the Al-Zn-Mg alloy ingot in the heating furnace is controlled at 450 ° C, and the Al- The temperature at the head of the Zn-Mg alloy ingot is 25°C higher than the temperature at the tail, and then on-line extrusion, the extrusion speed is controlled at 1.5m / min;

[0042] (2) Roller bottom continuous solution quenching: Put the Al-Zn-Mg alloy profile in step (1) into the roller hearth furnace, hold the temperature at 450°C, and the heat preservation accuracy is ±3°C, then perform continuous quenching, the quenching pressure It is 4.0bar, and the quenching method is water mist quenchin...