Aluminum alloy sheet for can lid

Abstract

One aspect of the present disclosure is an aluminum alloy sheet for a can lid 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 0.70 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 1.20 mass % or less; a magnesium (Mg) content of 1.1 mass % or more and 3.7 mass % or less; and a balance consisting of or including aluminum (Al) and inevitable impurities. The aluminum alloy sheet has a solidus temperature higher than a solid solutionizing temperature of Mg2Si.

1 . An aluminum alloy sheet for a can lid, the aluminum alloy sheet comprising:
 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 0.70 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 1.20 mass % or less;   a magnesium (Mg) content of 1.1 mass % or more and 3.7 mass % or less; and   a balance consisting of or comprising aluminum (Al) and inevitable impurities,   wherein the aluminum alloy sheet has a solidus temperature higher than a solid solutionizing temperature of Mg 2 Si.   
     
     
         2 . The aluminum alloy sheet for a can lid according to  claim 1 ,
 wherein the aluminum alloy sheet comprising:
 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; and 
 a magnesium (Mg) content or 1.1 mass % or more and 3.3 mass % or less, 
   wherein a solidification initiating temperature of Al is higher than a crystallization temperature of a primary crystal.   
     
     
         3 . The aluminum alloy sheet for a can lid according to  claim 2 ,
 wherein the aluminum alloy sheet comprising:
 a silicon (Si) content of 0.20 mass % or more and 0.39 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; and 
 a magnesium (Mg) content of 1.1 mass % or more and 3.1 mass % or less, 
   wherein a difference in temperature obtained by deducting a solid solutionizing temperature of Mg 2 Si from a solidus temperature is 30° C. or more.   
     
     
         4 . The aluminum alloy sheet for a can lid according to  claim 3 ,
 wherein the aluminum alloy sheet comprising:
 a silicon (Si) content of 0.20 mass % or more and 0.39 mass % or less; 
 an iron (Fe) content of 0.30 mass % or more and 0.51 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 0.92 mass % or less; and 
 a magnesium (Mg) content of 1.1 mass % or more and 2.9 mass % or less, 
   wherein a difference in temperature obtained by deducting a crystallization temperature of a primary crystal from a solidification initiating temperature of Al is 1° C. or more.