High-manganese-chromium-containing 6xxx series aluminum alloy material for automobile body and preparation method thereof
A technology for aluminum alloy materials and car bodies, which is applied in the field of 6XXX series aluminum alloy materials containing high manganese and chromium for automobile bodies and its preparation, can solve problems such as unsatisfactory, achieve the effect of easy folding and forming, and avoid cracking in crush tests
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[0026] The invention provides a technical solution: high-manganese-chromium-containing 6XXX series aluminum alloy material for automobile body and its preparation method, including 0.55-0.65% Si, <0.3% Fe, <0.15-0.25% Cu, 0.4 -0.5% Mn, 0.6-0.7% Mg, 0.15-0.2% Cr, <0.15% Zn, 0.02-0.05% Ti, 0.6-0.7% Mn+Cr, unavoidable impurity elements each <0.05 %, and the total amount of unavoidable impurity elements is less than 0.15%, and the balance is aluminum.
[0027] Preparation methods include:
[0028] Preparation of materials: Prepare pure metal aluminum, magnesium, copper, Al-Si master alloy, chromium agent, manganese agent, titanium boron agent, titanium boron wire according to the alloy composition;
[0029] Melting and casting: Put the prepared raw materials into the regenerative natural gas melting aluminum furnace for smelting, first add metallic pure aluminum and Al-Si intermediate alloy, and then add metallic copper after melting; add manganese agent and chromium when the tem...
Embodiment 1
[0035] a. Prepare materials: according to the scope of the alloy composition of the present invention, with pure metal aluminum, magnesium, copper, Al-Si master alloy, chromium agent, manganese agent, titanium boron agent, titanium boron wire, according to the Si of composition 0.59%, the Fe of 0.13% , 0.22% of Cu, 0.41% of Mn, 0.68% of Mg, 0.18% of Cr, 0.02% of Zn, 0.03% of Ti, 0.6% of Mn+Cr, unavoidable impurity elements each <0.05%, and not Avoid the total amount of impurity elements < 0.15%, and the balance is aluminum alloy.
[0036]b. Melting and casting: Put the prepared raw materials into the regenerative natural gas melting aluminum furnace for smelting, first add metal pure aluminum and Al-Si master alloy, after melting, then add metal copper; heat up to 740℃~750℃ and add manganese agent , chromium agent, and pure magnesium metal. After these metals are stirred evenly and fully melted, the temperature is raised to 750-760°C, and then the molten aluminum is treated wi...
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