BS EN 573-1-2004 pdf download.Aluminium and aluminium alloys Chemical composition and form of wrought products Part 1: Numerical designation system.
This BS EN 573-1 specifies a European designation system of wrought aluminium and aluminium alloys, based on an international designation system, and the procedure to obtain such international designation.
It Is in accordance with the Recommendation” dated December 15, 1970, as revised In March 2002, for an
International Designation System for Wrought Aluminum and Wrought Aluminum Alloys issued by the
Aluminum Association. Washington DC 20006, USA.
This standard applies to wrought products and to ingots intended to be wrought.
2 International registration procedure
All requests for international registration shall be submitted to The Aluminum Association by a signatory of the
Declaration of Accord. The organization that requests an alloy designation shall therefore comply with the
terms of the Declaration of Accord, as stated in the so called Teal Sheets” edited by The Aluminum
Association.
3 Basis for European designation
The designation is constituted successively by:
— prefix EN followed by a blank space;
— letter A representing aluminium;
— letter W representing wrought products;
— a hyphen;
— an international designation consisting of four digits, representing the chemical composition and, if required, a letter identifying a national variation; this designation is attributed by the Aluminum Association via the international registration procedure.
The designation assigned shall be in the lxxx group whenever the minimum aluminium content is specified as 99.00 % and greater. In the lxxx group, the last two of the tour digits in the designation indicate the minimum aluminium percentage. These digits are the same as the two digits to the right of the decimal point in the minimum aluminium percentage, when it is expressed to the nearest 0,01 %.
The second digit in the alloy designation indicates alloy modifications in impurity limits or alloying elements. It the second digit in the designation is zero, it indicates unalloyed aluminium having natural impurity limits; integers 1 to 9, which are assigned consecutively as needed, indicate special control of one or more individual impurities or alloying elements.
4.3 2xxx to 8xxx groups
The alloy designation in the 2xxx to 8xxx groups is determined by the alloying element (Mg2Si for 6xxx alloys) present in the greatest mean percentage. If the greatest mean percentage is common to more than one alloying element, choice of group will be in order of group sequence Cu, Mn, Si. Mg, Mg2Si, Zn or others.
In the 2xxx to 8xxx alloy groups the last two of the four digits in the designation have no special significance but serve only to identify the different aluminium alloys in the group.
The second digit in the alloy designation indicates the original alloy and alloy modifications. If the second figure in the designation is zero, it indicates the original alloy: integers 1 to 9 inclusive, which are assigned consecutively, indicate alloy modifications.
5 Registration rules for alloy modifications
A modification of the original alloy is limited to any one or a combination of the following:
6 Registration rules for national variations
National variations of wrought aluminium and wrought aluminium alloys registered by another country in accordance with this Recommendation [1] are identified by a serial letter after the numerical designation. The serial letters are assigned In alphabetical sequence starting with A for the first national variation registered. but omitting I, 0 and Q.
A national variation has composition limits which are similar but not identical to those registered by another country, with differences such as:
a) differences in arithmetic mean of limits for an individual alloying element or combination of elements expressed as an alloying element, or both, not exceeding the following amounts:
to determine compliance when maximum and minimum limits are specified for a combination of two or more elements An one alloy composition, the arithmetic mean of such combination is compared to the sum of the mean values of the same individual elements, or any combination thereof, in another alloy composition;
b) substitution of one alloying element for another element serving the same purpose;
C) different limits for impurities except for low iron, Iron maximum of 0.12 % or less, reflecting high purity base metal, should be considered as an alloy modification (see dause 5);
d) different limits on grain refining elements;
e) inclusion of a minimum limit for iron or silicon, or both.
An alloy meeting these requirements should not be registered as a new alloy or alloy modification.BS EN 573-1-2004 pdf download.