Aluminum alloy sheet for DR can body and manufacturing method therefor

Abstract

Provided is an aluminum alloy for DR can bodies, the alloy having a low earing rate and excellent deep drawing properties even when a batch furnace is used, and a manufacturing method therefor. An aluminum alloy sheet for DR can bodies and a manufacturing method therefor, the aluminum alloy sheet being obtained from an aluminum alloy containing Si: 0.10-0.60 mass% (% below), Fe: 0.10-0.80%, Cu: 0.05-0.25%, Mn: 0.80-1.50%, Mg: 0.80-1.30% and the remainder being obtained from Al and unavoidable impurities and the aluminum alloy sheet being made into a final sheet after passing from an ingot of said aluminum alloy to a hot-rolled sheet and to a process-annealed sheet. In the final sheet, the cube orientation density (CubeO) is 2.00 or more times the random orientation density and the ratio (CubeO / SO) of CubeO to the S orientation density (SO) is 0.40-1.00. After baking, the aluminum alloy sheet has a yield strength of 180-220 MPa and a tensile strength of at least 230 MPa.

Description

technical field [0001] The present invention relates to an aluminum alloy for DR can bodies with excellent deep drawability and low ear forming rate and a manufacturing method thereof. Background technique [0002] Aluminum alloys such as A3004 or A3104 in JIS standards are used as can body materials for aluminum cans because they have excellent formability and corrosion resistance. The body of aluminum cans includes DR cans manufactured only by deep drawing and DI cans manufactured by deep drawing and ironing. In these aluminum cans, lug rate is an important characteristic. Here, the selvage ratio will be described. In general, in a deep-drawn cup, a high portion ("mountain") and a low portion ("valley") are formed at the upper end of the peripheral portion. The value obtained by dividing the difference between the average value of the heights of the mountains and the average value of the heights of the valleys by the average value of the heights of the valleys is referr...

AI Technical Summary

Problems solved by technology

Due to the high proof stress of the superhard material used, it is easy to wrinkle during deep drawing, so it is not suitable for DR tanks

In addition, since the hot-rolled sheet structure of Patent Document 5 is a partially recrystallized structure, the partially recrystallized structure cannot be obtained unless the temperature of the sheet is lowered.

Therefore, the rolling speed, which is one of the manufacturing conditions, has to be reduced, resulting in a reduction in production efficiency and an increase in manufacturing cost.

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