Method of manufacturing aluminum alloy sheet for can lid

Abstract

One aspect of the present disclosure is a method of manufacturing an aluminum alloy sheet for a can lid. The method includes a process of casting an ingot that includes an Si content of 0.20 mass % or more and 0.47 mass % or less, an Fe content of 0.30 mass % or more and 0.59 mass % or less, a Cu content of 0.11 mass % or more and 0.40 mass % or less, an Mn content of 0.70 mass % or more and 0.98 mass % or less, and an Mg content of 1.3 mass % or more and 3.7 mass % or less; a process of homogenizing treatment on the ingot; and a process of rolling the ingot. In the process of rolling, cold rolling is completed without performing heat treatment after performing hot rolling on the ingot.

1 . A method of manufacturing an aluminum alloy sheet for a can lid, the method comprising:
 a process of casting an ingot, the ingot including:
 a silicon (Si) content of 0.20 mass % or more and 0.47 mass % or less; 
 an iron (Fe) content of 0.30 mass % or more and 0.59 mass % or less; 
 a copper (Cu) content of 0.11 mass % or more and 0.40 mass % or less; 
 a manganese (Mn) content of 0.70 mass % or more and 0.98 mass % or less; 
 a magnesium (Mg) content of 1.3 mass % or more and 3.7 mass % or less; and 
 a balance consisting of or including aluminum (Al) and inevitable impurities; 
   a process of homogenizing treatment on the ingot; and   a process of rolling the ingot that underwent the homogenizing treatment,   wherein, in the process of rolling, cold rolling is completed without performing heat treatment after performing hot rolling on the ingot,   wherein, in the process of homogenizing treatment, homogenizing treatment is performed on the ingot at a temperature higher than or equal to a solid solutionizing temperature of Mg 2 Si and lower than or equal to a solidus temperature of an aluminum matrix,   wherein the content of iron (Fe) is 0.30 mass % or more and 0.55 mass % or less,   wherein the content of copper (Cu) is 0.17 mass % or more and 0.25 mass % or less, and   wherein the content of magnesium (Mg) is 2.6 mass % or more and 3.7 mass % or less.   
     
     
         2 . (canceled) 
     
     
         3 . (canceled) 
     
     
         4 . The method of manufacturing an aluminum alloy sheet for a can lid according to  claim 1 ,
 wherein, in the process of casting, the casting is performed on the ingot that includes:
 a silicon (Si) content of 0.20 mass % or more and 0.30 mass % or less; 
 an iron (Fe) content of 0.30 mass % or more and 0.55 mass % or less; 
 a copper (Cu) content of 0.17 mass % or more and 0.25 mass % or less; 
 a manganese (Mn) content of 0.70 mass % or more and 0.98 mass % or less; 
 a magnesium (Mg) content of 2.6 mass % or more and 3.7 mass % or less; and 
 a balance consisting of or including aluminum (Al) and inevitable impurities. 
   
     
     
         5 . The method of manufacturing an aluminum alloy sheet for a can lid according to  claim 4 , further comprising
 a process of baking, at 270° C. or lower, a coating on a plate material obtained through the cold rolling of the ingot.   
     
     
         6 . The method of manufacturing an aluminum alloy sheet for a can lid according to  claim 5 ,
 wherein, in the process of rolling, the cold rolling is performed at a reduction of 90% or less.