BS-EN-573-3:2009 pdf free download – Aluminium and aluminium alloys一 Chemical composition and form of wrought products Part 3: Chemical composition and form of products.
B.1 General principles
Proposals for the introduction of new alloys In CENITC 132 standards or the elimination of existing alloys can be made at any time. If agreed, CENITC 132 shall Initiate drafts of amendments or of revisIons, as appropnate, These drafts shall be processed following the usual CENICENELEC procedures
B.2 Rules for introduction of new alloys
Only those aluminium and aluminium alloys shall be considered for indusion m CENITC 132 standards which are:
a) registered as active alloys m the Registration Record 9ntemational Alloy Designations and Chemical Composition Limits for Wrought Aluminium and Wrought Aluminium Moys. [1) 7eal Sheet&’ or published In a regular addendum [21 to the Teal Sheets, for the same numerical designation and the same composition limits for all elements:
b) currently manufactured and sold in at least one CEN member country, in commercial quantities and in at least one of the product forms listed in Annex A of this standard:
C) supported by at least one Nahonal Standards Organisatlon.
B.3 Procedure for introduction of new alloys
Each proposal shall contain the following information:
a) designation and composition limits as registered In the Teal sheets:
b) proposal for a chemical symbol based designation according to EN 573-2;
c) indication of application and form of product for which an Introduction Is required:
d) proposal of specific characteristics of new alloys, as appropriate, e.g mechanical properties.
B.4 Addendum for new alloys for future Introduction
It has been agreed by CEN/TC 132 to revise EN 573-3 every two years via the UAP procedure.
For unalloyed aluminium not made by a refining process, the aluminium content is the difference between 100,00 % and the sum of all other metallic elements present in amounts of 0,010 % or more each expressed to the second decimal place before determining the sum.
5 Alloy designations
The numerical designation systems used in Teal sheets and European Standards for wrought aluminium alloys are identical. As specified in EN 573-1 the prefix EN AW- is added.
The alternative chemical symbol based alloy designation system shall be based on EN 573-2.
Both the numerical and the chemical symbol based designations are indicated in Tables 1 to 8.
The International numerical system is the preferred one. The chemical symbol based designations are
indicated for reference only.
6 Sequence of elements
Standard limits for alloying elements and impurities are expressed in the following sequence: silicon, iron, copper, manganese, magnesium, chromium, nickel, zinc, titanium, gallium, vanadium, remarks, other elements each, other elements total, aluminium.
Limits of additional specified elements are inserted in alphabetical order of their chemical symbols under “Remarks”.
7 Rounding rules for determination of compliance
In recording chemical analysis test results, the number representing the result for any element specified in this standard shall be expressed to the same number of decimal places as the corresponding number in this standard. For unalloyed aluminium, the aluminium content is derived as described in 4.2.
The following rounding rules shall be used for determination of compliance with this standard:
a) when the figure immediately after the last figure to be retained is less than 5, the last figure to be retained remains unchanged;
b) when the figure immediately after the last figure to be retained is greater than 5, or equal to 5 and followed by at least one figure other than zero, the last figure to be retained is increased by one;
c) when the figure immediately after the last figure to be retained is equal to 5 and followed by zeros only, the last figure to be retained remains unchanged if even and is increased by one if odd.
