Aluminum alloy sheet and production method therefor

Abstract

An aluminum alloy sheet according to the present disclosure includes 0.05 to 0.60% by mass of Si, 0.05 to 0.80% by mass of Fe, 0.05 to 0.25% by mass of Cu, 0.80 to 1.50% by mass of Mn, 0.80 to 1.50% by mass Mg, Al, and inevitable impurities. In this aluminum alloy sheet, a 45° earing ratio of a cup formed by a first drawing of the aluminum alloy sheet is 2.0% or less, and a value obtained by subtracting the 45° earing ratio from a 0-180° earing ratio of the cup formed by the first drawing of the aluminum alloy sheet is −1.0% or more and 2.0% or less.

What is claimed is: 
     
         1 . A production method for an aluminum alloy sheet comprising:
 homogenizing treatment of an aluminum alloy ingot including 0.05 to 0.60% by mass of Si, 0.05 to 0.80% by mass of Fe, 0.05 to 0.25% by mass of Cu, 0.80 to 1.50% by mass of Mn, 0.80 to 1.50% by mass of Mg, Al, and inevitable impurities;   hot rough rolling of the aluminum alloy ingot with a reversing mill under a condition where:
 an ending temperature is 400 to 550° C.; 
 a reduction ratio at a last pass is 5.0 to 40%; and 
 a strain rate at the last pass is 5.0 to 30 s −1 , 
   hot finishing rolling of the aluminum alloy ingot with a tandem hot rolling machine; and   cold rolling of the aluminum alloy ingot under a condition where the reduction ratio is 80 to 90%.   
     
     
         2 . The production method for an aluminum alloy sheet according to  claim 1 ,
 wherein the homogenizing treatment is performed at a temperature of 580 to 610° C. for 2 to 48 hours.   
     
     
         3 . The production method for an aluminum alloy sheet according to  claim 1 ,
 wherein an ending temperature in the hot finishing rolling is 300 to 400° C., and   wherein a total reduction ratio in the hot finishing rolling is 80 to 95%.   
     
     
         4 . The production method for an aluminum alloy sheet according to  claim 1 ,
 wherein an aluminum alloy sheet comprising:   0.05 to 0.60% by mass of Si;   0.05 to 0.80% by mass of Fe;   0.05 to 0.25% by mass of Cu;   0.80 to 1.50% by mass of Mn;   0.80 to 1.50% by mass of Mg;   Al; and   inevitable impurities,   wherein a 45° earing ratio of a cup formed by a first drawing of the aluminum alloy sheet is 2.0% or less, and   wherein a value obtained by subtracting the 45° earing ratio from a 0-180° earing ratio of the cup formed by the first drawing of the aluminum alloy sheet is −1.0% or more and 2.0% or less, is produced.