BS 1676:2010 pdf download – Aluminium and aluminium alloys — Alloyed ingots for remelting — Specifications
5.4Freedom from defects
To a standard agreed between supplier and purchaser, the ingots shall be reasonably free from:
a) visible defects such as grease, dirt, products of corrosion, dross or any other foreign bodies,including paint apart from that which is approved for marking purposes;
b) metallic or non-metallic inclusions;
c)gas porosity.
The ingots can have shrinkage holes or cracks, which can retain water.They shall therefore be thoroughlydried and preheated before coming in contact with liquid metal to avoid the risk of a violent explosion.
5.5 Form of products
There are several possible shapes of ingots, e.g.
trapezoidal which can be stacked. This type of ingot may have one or more notches to enable it to bedivided into pieces if required;
– continuously cast material;
-other shapes.
The dimensions and tolerances on dimensions of the ingots and bundles and the variations on the unitmasses shall be agreed between supplier and purchaser at the time of ordering.
NOTEA further form of product can be as liquid metal.See also EN 577.
6 Product inspection and testing methods
6.1Chemical analysis
Sampling shall be carried out at the time of casting according to EN 14361. The average content of eachsample shall be within the specification for the chemical composition.
The range of application and accuracy of the test procedure used shall be validated and proved by thesupplier.
In the case of dispute concerning chemical composition, referee analysis shall be carried out in accordancewith EN 14242.
NOTE For the fast determination of the chemical composition different spectral analysis methods are used(e.g.S-OES,XRF,GDOES).For S-OES, see EN 14726.
6.2Chemical composition limits
The chemical composition is specified in Table 1. The figures specify the maximum limit as percentage bymass, unless minimum limits are also shown.
NOTE Table 1 also includes the chemical compositions of castings. These are shown in brackets where they differfrom the ingot limits and are taken from EN 1706.
6.3Rounding rules for determination of compliance
ln recording chemical analysis results, the number representing the result for any value specified in thisEuropean Standard shall be expressed to the same number of decimal places as the corresponding numberin this European Standard.
The following rounding rules shall be used for determination of compliance with this European 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.
See also EN 1780-3.
7 lnspection documents
The producer shall supply the grade of aluminium alloy quoted on the order document. By agreement betweenthe supplier and the purchaser or when specified on the order document, the consignment shall beaccompanied by a certificate listing the results of the analysis of the chemical elements noted in Table 1 andany other element which may have been previously requested, as a specific inspection.
8Marking of products
Unless otherwise indicated on the order document, each unit (i.e. bundle of ingots,T-bar or sow) shall bearone or more marks, which show the following:
the producer identification;
—the alloy designation;
—the melt number;
—the mass of the unit.
The method of marking is left to the discretion of the supplier, but it shall be sufficiently weather-proof andshall not be a source of contamination.
lt is recommended that each unit carries a warning about the risk of explosion when getting in contact withliquid metal without first being properly dried (see 5.4).
Small ingots shall be gathered together in bundles, the mass of which should not generally exceed one tonne.Each bundle shall be made from only one melt.