{"id":5501,"date":"2025-12-03T11:32:52","date_gmt":"2025-12-03T03:32:52","guid":{"rendered":"https:\/\/zhss.org\/?p=5501"},"modified":"2025-12-17T11:06:10","modified_gmt":"2025-12-17T03:06:10","slug":"cn-standards-for-rolled-aluminium","status":"publish","type":"post","link":"https:\/\/zhss.org\/pt\/metals\/aluminium\/cn-standards-for-rolled-aluminium\/","title":{"rendered":"Normas CN para alum\u00ednio laminado"},"content":{"rendered":"\t\t
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CN Standards For Rolled Aluminium\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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Differences Between BS & CN Standards\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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  • \n\t\t\t\t\t\t\t\t\t\tFor those familiar with the old BS1470 it is useful to highlight where the new CN standards differ:<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tChemical Compositions \u2013 No Change.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tAlloy Numbering System \u2013 No Change.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tTemper Designations for Heat Treatable Alloys \u2013 A new wider range of special tempers having up to four digits after the T have been introduced for non- standard applications (e.g. T6151).<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tTemper Designations for Non Heat Treatable Alloys \u2013 No change to existing tempers but a more comprehensive definition of how tempers are achieved.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tMechanical Properties \u2013 Similar but not identical. Also, 0.2% Proof Stress must now be quoted on test certificates.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tThickness Tolerances \u2013 Considerably tighter for alloys<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t1050A & 3103. To reflect manufacturing difficulty the tolerances for alloys 5251, 5083 & 6082 are now wider than this, although still a little tighter than in BS1470.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tLength and Width Tolerances \u2013 These tend to be tighter and are now all on the plus side (i.e. minus zero).<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t
  • \n\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t<\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\tFlatness Tolerances \u2013 These are considerably tighter.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t
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    Alloy Groups\n\n\n\n\n<\/h2>\t\t\t\t<\/div>\n\t\t\t\t
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    Please note that thickness tolerances for cold rolled material vary according to alloy, with the alloys falling into two groups as shown below.<\/p><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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    Aluminium Alloy Groups<\/h3>\n
    \n \n\n \n \n \n \n \n \n \n \n \n \n \n \n \n
    \n Alloy Group <\/td>\n <\/tr>\n
    \n Alloy Group I <\/td>\n <\/tr>\n
    \n 1080A, 1070A, 1050A, 1200 <\/td>\n <\/tr>\n
    \n 3003, 3005, 3103, 3105 <\/td>\n <\/tr>\n
    \n 4006, 4007 <\/td>\n <\/tr>\n
    \n 5005, 5050 <\/td>\n <\/tr>\n
    \n 8011A <\/td>\n <\/tr>\n
    \n Alloy Group II <\/td>\n <\/tr>\n
    \n 2014, 2017A, 2024 <\/td>\n <\/tr>\n
    \n 3004 <\/td>\n <\/tr>\n
    \n 5040, 5049, 8053, 5086, 5251, 5052, 5154A, 5454, 5754, 5182, <\/td>\n <\/tr>\n
    \n 6061, 6082 <\/td>\n <\/tr>\n
    \n 7020, 7021, 7022, 7075 <\/td>\n <\/tr>\n <\/table>\n<\/div>