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IS0
I NTERN AT I O N A L O RG A N I2 AT1 O N FO R STA N DARD I ZATl O N
IS0 RECOMMENDATION
R 829
MECHANICAL PROPERTY LIMITS
FOR ALUMINIUM ALLOY FORGINGS
1st EDITION
September 1968
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The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorizui therefore oniy
by the nationai standards organization of that country, being
a member of ISO.
For each individual country the oniy valid standard is the national standard of that country.
printed in Switzetland
Ah issued in French 'and Russian. Copies to be obtained through the national standards organizations.
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ISO/R 829-1968 (E
1 IS0 Recommendation R 829 September 1968
MECHANICAL PROPERTY LIMITS
FOR ALUMINIUM ALLOY FORGINGS
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.
The property limits given in section 3 apply to test pieces of not more than 30 mm (14 in)
diameter or thickness. adequately forged from the forging stock which may be cast. extruded or
rolled. Alternatively, the test pieces may be cut from forgingç of not more than 75 mm (3 in)
thickness, except that the elongation values should be reduced to 70 of the listed values.
The test of the separately forged test pieces or of test pieces cut from forgings should be made in
the direction of major metal flow.
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 (Rm), should be
rounded off to the nearest O. 1 kgf/mm* (or 100 Ibf/in2) and those of the percentage elongation (A)
to the nearest 1 (see Annexes A and B of IS0 Recommendation R 826. Mechanical propert)' limits
for rolled products of aluminium and aluniiniitm alloys).
2. SYMBOLS AND ABBREVIATIONS
The symbols and abbreviations used in section 3 have the following meanings :
I
Rc (0.2) : 0.2 proof stress or yield strength
Rrn : Tensile strength I
A : Percent
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