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

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What is BS EN 1706:2020 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 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?

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 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.

What’s new about BS EN 1706:2020?

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:

a)       Normative reference BS EN 10002-1 was replaced by BS EN ISO 6892-1

b)      Terms and definitions were updated

c)       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

d)      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

e)      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

f)        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

g)       A new Annex B was added and the former Annex B renamed to Annex C

h)      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

The former Annex C was renamed to Annex D and Table D.1 was completely revised.