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Ref. No. : ISO/R 826-1968 (E)
UDC 669.71-122 : 539.3/.4
IS0
I N T ER N AT I O N A L ORGAN 1 Z AT 1 ON FOR S TA N DARD 1 ZATl O N
IS0 RECOMMENDATION
.
R 826
MECHANICAL PROPERTY LIMITS
FOR ROLLED PRODUCTS OF ALUMINIUM
AND ALUMINIUM ALLOYS
1st EDITION
September 1968
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 826, Mechanical property limits for rolled products of aluminium
was drawn up by Technical Committee ISO/TC 79, Light metals and their
and aluminium alloys,
alloys, the Secretariat of which is held by the Association Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1959 and led, in 1965, to the
adoption of a Draft IS0 Recommendation.
In October 1966, this Draft IS0 Recommendation (No. 1116) was circulated to all the IS0
Member Bodies for enquiry. It was approved, subject to a few modifications of an editorial nature, by
the following Member Bodies :
Austria Ireland South Africa, Rep. of
Belgium Israel Turkey
Canada Italy U.A.R.
Chile Japan United Kingdom
Czechoslovakia Netherlands U.S.A.
France Norway U.S.S.R.
Hungary Sweden Yugoslavia
India Switzerland
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in September 1968, to accept it as an IS0 RECOMMENDATION.
-2-
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tSO/R 826-1968 (E
IS0 Recommendation R 826 September 1968
MECHANICAL PROPERTY LIMITS
FOR ROLLED PRODUCTS OF ALUMINIUM
AND ALUMINIUM ALLOYS
.
1. SCOPE
The grades or alloys listed in this IS0 Recommendation are those the designation and chemical
composition of which are specified in IS0 Recommendation R 209 -1968, Composition of wrought
products of aluminium and aluminium alloys.
Before comparing them with the limiting values listed in section 3, the measured or calculated values
of 0.2 proof stress or yield strength [ R,(0.2)], or of tensile strength (f?,,.,), should be rounded off
to the nearest 0.1 kgf/mm2 (or 100 lbf/in2) and those of the percentage elongation (A) to the
nearest 1 (see Annexes A and B).
For products up to 2.6 mm (0.102 in) thick, national standards may contain either elongation
requirements or bend test requirements, or both.
The values given for alloys AlCu4MgSi, Al-Cu4Mgl and Al-Cu4SiMg apply to the material delivered
by the supplier in the “solution treated and naturally aged” condition (or “solution treated and
precipitation treated” condition). If the user reheat-treats the material, these values may not be at-
tained.
L
2. SYMBOLS AND ABBREVIATIONS
The symbols and abbreviations used in section 3 have the following meanings :
R, (0.2) : 0.2 proof stress or yield strength
Rm : Tensile strength
A : Percentage elongation after rupture
: Original cross-sectional area of the gauge length of the test piece
so
1 kgf/mm2 : 1 kilogramme-force per square millimetre = about 9.8 N/mm2
(newton per square millimetre)
1 O00 lbf/in2 : 1000 pounds-force per square inch = about 6.9 N/mmz
-3-
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