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...
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