Wide-range thin-wall series-6 aluminum alloy section for high speed train and preparation method of wide-range thin-wall series-6 aluminum alloy section

Abstract

The invention belongs to the technical field of preparation of aluminum alloy sections, and relates to a wide-range thin-wall series-6 aluminum alloy section for a high speed train and a preparation method of the wide-range thin-wall series-6 aluminum alloy section. Aluminum alloy comprises the following elements in percentages by weight: 0.50-0.65% of Si, less than or equal to 0.25% of Fe, less than or equal to 0.10% of Cu, 0.03-0.15% of Mn, 0.45-0.55% of Mg, less than or equal to 0.05% of Cr, less than or equal to 0.05% of Zn, less than or equal to 0.10% of Ti, less than or equal to 0.05% ofa single impurity, less than or equal to 0.15% of total impurities and the balance of Al. Deformation resistance and friction resistance in an extruding process are reduced by reasonably controllingthe temperature relationship of an ingot casting, an extrusion barrel and a die, the extruding speed is increased to be 8-13 m / min, the quenching temperature of the product is ensured, thus, any coarse grain rings are not generated when a thin-walled apron board is extruded at high speed, after being subjected to on-line quenching, the product is directly subjected to artificial ageing at the temperature of 175+ / - 5 DEG C for 4-8 hours, the mechanical property of the product can meet requirements in TB / T.3260.4-2011 TO 1.2 mm thin-walled sections, the actual tensile strength reaches 250-270 MPa, the yield strength reaches 210-230 MPa, the specific elongation is 8-10%, and the grade of the grain size of an aluminum section microscopic structure reaches and even exceeds 4.

Description

technical field [0001] The invention belongs to the technical field of preparation of aluminum alloy profiles, and relates to a wide-width thin-walled 6-series aluminum alloy profile for high-speed EMUs and a preparation method thereof, in particular to a 6-series aluminum for high-speed EMUs wide-width thin-walled skirt boards Alloy profile and its preparation method. Background technique [0002] Most of the key equipment of the high-speed EMU is hoisted under the car body, in order to avoid the unexpected situation of high-speed impact of stones, ice or other objects on the equipment under the train, and at the same time to reduce air resistance, protect and repair the equipment under the train, and ensure high-speed For the safe operation of EMUs, skirts with diversion, protection and maintenance functions must be installed under high-speed EMUs. The apron is generally made of 6N01 aluminum alloy extruded profiles. The 6N01 series aluminum alloy has the advantages of lo...

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Problems solved by technology

[0007] In view of this, the present invention solves the problems that extrusion cannot be formed and the production efficiency is low in the process of preparing aluminum alloy profiles for high-speed EMU skirts with a width-to-thickness ratio greater than 500 in the prior art. The present invention provides a high-speed EMU Wide and thin-walled 6-series aluminum alloy profile and its preparation method

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