Al-Mg alloy plate strip and preparation method thereof

By controlling the composition and process parameters of the Al-Mg alloy, the balance between high strength and good formability of 5182 aluminum alloy sheets with a thickness of 1.8mm or more was solved, especially the problem of no cracking under 90° bending conditions, thus achieving a balance between high strength and good formability.

CN122428178APending Publication Date: 2026-07-21BAOSHAN IRON & STEEL CO LTD
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Patent Information

Application Number
CN202510089207.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-21
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing technologies struggle to balance high strength and good formability in 5182 aluminum alloy sheets with a thickness of 1.8 mm or more, especially in terms of crack resistance under 90° bending conditions.

Method used

By controlling the composition of Al-Mg alloys, including the content ranges of Si, Fe, Mn, Cu, Cr, and V, and combining homogenization, hot rolling, and cold rolling process parameters, the grain structure is controlled to ensure that the number of compounds with a long axis dimension greater than 7 μm accounts for ≤5% of the total number of compounds, the number of compounds with a long axis dimension greater than 10 μm is ≤50 per mm2, the grain aspect ratio is 3.2-7, and the number of grains with an aspect ratio greater than 7 is <5%.

Benefits of technology

Al-Mg alloy sheets and strips with thicknesses of 1.8-3mm have achieved high strength and good formability in both the 0° and 90° directions, with yield strength of 260-280MPa, tensile strength of 345-375MPa, elongation of 9-14%, and no cracking after 90° bending; yield strength of 250-270MPa, tensile strength of 341-372MPa, elongation of 10-15%, and no cracking after 90° bending.

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Abstract

The invention discloses an Al-Mg alloy plate strip and a preparation method thereof, the Al-Mg alloy plate strip comprises the following components in percentage by weight: more than 0 and less than or equal to 0.1% of Si, more than 0 and less than or equal to 0.18% of Fe, 0.2-0.28% of Mn, 4.5-4.85% of Mg, 0.01-0.02% of Ti, less than or equal to 0.1% of Cu and the balance of Al and other inevitable impurities, and Fe / Si is more than or equal to 1; mn + Mg + Cu is greater than or equal to 4.75% and less than or equal to 5.1%. The thickness of the obtained alloy plate strip reaches 1.8-3 mm, and the structure of the plate is regulated and controlled, so that the alloy plate strip has relatively high strength and good forming performance; in the 0-degree direction of the Al-Mg alloy plate strip, the yield strength ranges from 260 MPa to 280 MPa, the tensile strength ranges from 345 MPa to 375 MPa, the ductility ranges from 9% to 14%, and the Al-Mg alloy plate strip does not crack after being bent by 90 degrees; and in the 90-degree direction, the yield strength ranges from 250 MPa to 270 MPa, the tensile strength ranges from 341 MPa to 372 MPa, the ductility ranges from 10% to 15%, and cracking is avoided after 90-degree bending.
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