Aluminium and aluminium alloys. Castings. Chemical composition and mechanical properties

Aluminium and aluminium alloys. Castings. Chemical composition and mechanical properties

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What is BS EN 1706:2020+A1:2021 about?

It covers the chemical composition limits and mechanical properties of aluminium casting alloys. BS EN 1706:2020 is an extensive update of the 2010 version of this standard.

Who is BS EN 1706:2020+A1:2021 for?

  • Those who do casting in engineering
  • Those who do casting in automotive and aerospace gearing
  • Those who do investment casting
  • Designers
  • Architects

Why should you use BS EN 1706:2020+A1:2021?

This European standard specifies the chemical composition limits of aluminium casting alloys and the mechanical properties of separately cast test pieces for these alloys. Annex C is a guide to the selection of alloys for a specific use or process.

BS EN 1706:2020+A1:2021 provides particularly important guidance given that most UK aluminium is recycled. In addition, use of this standard:

  • Creates a level playing field between castors and producers and designers
  • Aids the creation of better products
  • Increases trust, giving end-users confidence in products
  • Enables entry to new markets and facilitates trade
  • Manages risk

NOTE: BS EN 1706:2020 is intended to be used in conjunction with BS EN 576, BS EN 1559-1, BS EN 1559-4, BS EN 1676 and BS EN ISO 8062-3.


BS EN 1706:2020+A1:2021 can contribute towards users achieving UN Sustainable Development Goal 9 on industry, innovation and infrastructure because it promotes resilient infrastructure. It also contributes to Goal 12 on responsible consumption and production because it supports aluminium recycling. 

What’s new about BS EN 1706:2020+A1:2021?

The standard was extensively rewritten to bring it up to date with current methodologies. In comparison with the 2010 standard, the following significant changes were made:

  1. Normative reference BS EN 10002-1 was replaced by BS EN ISO 6892-1
  2. Terms and definitions were updated
  3. In Table 1:
    1. Two alloys were deleted and six added
    2. The maximum limit for lead was reduced to 0,29 %
    3. Footnotes were added and modified
    4. The chemical composition limits of the alloys EN AC-43000 [EN AC-Al Si10Mg], EN AC43300 [EN AC-Al Si9Mg] and EN AC-51300 [EN AC-AlMg5] were modified
  4. In Table 2:
    1. Two alloys were deleted and three added
    2. A new footnote was added
    3. The mechanical properties of the already existing alloys EN AC-42100 [EN AC-Al Si7Mg0,3], EN AC-43300 [EN AC-Al Si9Mg] and EN AC-71100 [EN AC-Al Zn10Si8Mg] were modified
  5. In Table 3:
    1. Two alloys were deleted and two added
    2. The mechanical properties of the already existing alloys EN AC-46200 [EN AC-Al Si8Cu3], EN AC-43300 [EN AC-Al Si9Mg] and EN AC-71100 [EN AC-Al Zn10Si8Mg] were modified
  6. In Table A.1:
    1. One alloy was deleted and three added
    2. The mechanical properties of the already existing alloys EN AC-43500 [EN AC-Al Si10MnMg], EN AC-46000 [EN AC-Al Si9Cu3(Fe)] and EN AC-71100 [EN AC-Al Zn10Si8Mg] were modified
  7. A new Annex B was added and the former Annex B renamed to Annex C
  8. In Table C.1, the same alloys as in Table 1 were added or deleted respectively. The suitability of some casting methods was revised for some alloys as well as some rankings of properties, and footnotes were modified
  9. The former Annex C was renamed to Annex D and Table D.1 was completely revised