BS EN 1706 pdf free download
BS EN 1706-2020 pdf free download.Aluminium and aluminium alloys – Castings – Chemical composition and mechanical properties.
4 Ordering information
The order document shall include a reference to this document. It shall include all the ordering
information as required in EN 1559-1 and EN 1559-4.
5 Designation systems
5.1 Numerical designation system
The numerical designation system shall be in accordance with EN 1780-1.
5.2 Chemical symbol based designation system
The chemical symbol based designation system shall be in accordance with EN 1780-2.
For unalloyed grades, the designation shall be in accordance with EN 576.
5.3 Temper designations
The following abbreviations shall be used as temper designations for the conditions of heat treatment, referred in Tables 2,3 and 4 and Table A.l:
— F as cast;
— 0 annealed;
— Ti controlled cooling from casting and naturally aged;
— T4 solution heat treated and naturally aged where applicable;
— T5 controlled cooling from casting and artificially aged or over-aged;
— T6 solution heat treated and fully artificially aged;
— T64 solution heat treated and artificially under-aged;
— T7 solution heat treated and artificially over-aged (stabilized).
NOTE For aluminium alloy castings, solution heat treatment involves quenching from elevated temperatures and distortion can occur.
5.4 Casting process designations
The following abbreviations shall be used as designations for the different casting processes:
— S sand casting;
— K chill or permanent mould casting;
— D high pressure die casting;
— L investment casting.
5.5 Designations to be included in drawings
The complete designation of the casting shall be included in the drawings being part of the order information. This designation includes:
— the number of this document;
— the alloy designation;
— the casting process designation;
— the temper designation.
EXAMPLE EN 1706 AC-42000-K-T6 is the complete designation of the alloy EN AC-42000. chill cast, solution
heat treated and fully artificially aged.
6 Chemical composition
6.1 General
Chemical composition shall be expressed in accordance with the writing rules given in EN 1780-3. The chemical composition of aluminium castings shall be in conformity with the limits specified in Table 1.
NOTE Table 1 also includes the chemical compositions of ingots used to produce castings. These are shown in brackets where they differ from the casting limits and are taken from EN 1676.
The chemical analysis of elements for which specific limits are given in Table 1 shall be carried out. By agreement between supplier and purchaser other elements may be determined. This particularly applies to modifying or refining elements such as sodium, strontium, antimony and phosphorus. Alloying elements and impurities shall be expressed in the following sequence: silicon, iron, copper, manganese, magnesium, chromium, nickel, zinc, lead, tin, titanium, other elements each/total, aluminium.
Additional specified elements with specific limits shall be inserted, in alphabetical order with respect to their chemical symbols after titanium, or be specified in footnotes.
6.2 Samples for chemical analysis
When a chemical analysis is carried out by spark emission spectrometry, samples shall be taken from the melt at the time the castings are made and shall be cast into a metallic die.
If chemical analysis by emission spectrometry is carried out on a casting, it is recommended that a part of the casting is remelted and cast into a metallic die to minimize the unavoidable segregation effect. The content of certain elements such as sodium, strontium and magnesium, is normally reduced by the remelting, and chemical analysis of such elements should be made directly on the casting.
For sampling the use of EN 14361 is recommended. For chemical analysis the use of EN 14242 and EN 14726 is recommended.BS EN 1706 pdf download.
