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UDC 669.3
INTERN AT1 ON AL ORGAN IZATl O N FOR STANDARD I ZATlO N
IS0 RECOMMENDATION
R 426
CLASSIFICATION
OF BRASSES, LEADED BRASSES, SPECIAL BRASSES
AND HIGH TENSILE BRASSES
1st ED IT ION
March 1965
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
Copies to be obtained through the national standards organizations.
Also issued in French and Russian.
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BRIEF HISTORY
The IS0 Recommendation R 426, Classijïcation of Brasses, Leaded Brasses, Special Brasses
and High Tensile Brasses, was drawn up by Technical Committee ISO/TC 26, Copper and Copper
Alloys, the Secretariat of which is held by the Deutscher Normenausschuss (DNA).
Work on this question by the Technical Committee began in 1960 and led, in 1962, to the
adoption of a Draft IS0 Recommendation.
In December 1962, this Draft IS0 Recommendation (No. 543) 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:
Australia
Germany Romania
Belgium
Greece Spain
Brazil India Sweden
Canada Iran Switzerland
Chile Italy Turkey
Denmark Japan United Kingdom
Finland
Netherlands Yugoslavia
France Poland
One Member Body opposed the approval of the Draft:
U.S.S.R.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in March 1965, to accept it as an IS0 RECOMMENDATION.
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ISO/R 426 - 1965 (E)
IS0 Recommendation R 426 March 1965
CLASSIFICATION
OF BRASSES, LEADED BRASSES, SPECIAL BRASSES
AND HIGH TENSILE BRASSES
1. SCOPE
This IS0 Recommendation relates to the chemical composition and forms of semi-manufac-
tured products of the following wrought copper alloys:
Brasses,
Leaded brasses,
Special brasses,
High tensile brasses,
currently available in commercial quantities.
It is intended as a classification and not as a specification for the various types. For the classi-
fication principles, see Appendix.
2. GENERAL
The chemical compositions given below show only the main constituent elements and usual
impurities. It is the responsibility of the supplier to ensure that any element not specifically
limited by this IS0 Recommendation is not present in an amount such as is generally accepted
as having an adverse effect on the product. If the purchaser's requirements necessitate limits for
any element not specified, these should be agreed upon between supplier and purchaser.
3. CHEMICAL COMPOSITION (PER CENT)
3.1 Brasses
TABLE 1
~~
Average
Maximum impurities
density*
Designation
Cu Zn
kg/dm3
Fe 1 Pb 1 Total
I
8.80
Cu ZnlO 89.0 to 91 .O o. 1 1 0.1 O. 5
Cu Zn15 84.0 to 86.0 o. 1 0.1 ' 0.5 8.75
I
Cu Zn20 78.5 to 81.5 0.1 1 0.1 0.5 8.65
Cu Zn30 68.5 to 71.5 0.1 ' 0.1 ' 0.4 8.55
Cu Zn33 65.5 to 68.5 0.1 1 0.1 1 0.5 8.50
Cu Zn37 62.0 to 65.5 0.2 ' 0.3 I 0.5** 8.45
59.0 to 62.0 8.40
Cu Zn40 0.2 ~ 0.3 0.5**
* For information only.
* * Excluding Pb.
I
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ISO/R 426 - 1965 (E)
The classification of leaded brasses is very difficult. It is important to realise that lead is
added primarily to brass alloys to facilitate machining and free cutting, but that it has an
adverse effect on ductility. Moreover, through long-established practice, different countries
have different lead and copper contents within the given ranges for the same end-use.
TABLE 2
Maximum
Aver-
impurities
age
den-
Cu Pb Total
Designation Mainly used for
sity*
ex-
Fe cluding
I Fe
I
General high speed machin-
8.5
Cu Zn40 Pb3 56.0-59.0 2.0-3.5 1.35 I 0.7
ed parts
Hot forgings appropriate
8.4
1.35 0.7
Cu Zn39 Pb2 57.0-60.0 1.0-2.5
for free cutting
-
- -
General high speed machin-
8.5
2.35 O. 5 ed parts with some cold
Cu Zn36 Pb3 60.0-63.0 2.5-3.7
formability
-
General applications with
8.4
0.2 O. 3
Cu Zn40 Pb 59.0-62.0 0.3-0.8
reasonable machinability
Reasonable machinability
with sufficient ductility to
0.2 O. 3 8.4
Cu Zn38 Pbl 59.0-63.0 0.5- 1.5
permit a degree of cold
bending and cold forming
Good machinability with
sufficient ductility to permit
0.2 ~ 0.3 1 8.5
61 .O-64.0 1.0-2.0
Cu Zn36 Pb2
a degree of rivetting, head-
ing and cold forming
* For information only.
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IÇO/R 426 - 1965 (E)
3.3 Special brasses
TABLE 3
-
Aver-
Maximum impurities
age.
densi-
Zn
Designation Cu* Sn AI As**
ty***
Total
Fe 1 Pb
;g/dm:
~
The
7
...