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I NT E R NAT1 O NA L ORGAN I Z AT10 N FOR STA N DA RD I ZATl O N
I SO R ECO M M EN DATI O N
R 427
CLASSIFICATION OF TIN BRONZES AND SPECIAL TIN BRONZES
1st EDITION
March 1965
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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 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 427, Classification of Tin Bronzes and Special Tin Bronzes,
was drawn up by Technical Committee ISO/TC 26, Copper and Copper Alloys, the Secretariat of
which is held by the Deutscher Normenausschuss (DNA).
1960 and led, in 1962, to the
Work on this question by the Technical Committee began in
adoption of a Draft IS0 Recommendation.
In December 1962, this Draft IS0 Recommendation (No. 544) 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:
Germany Romania
Australia
Greece Spain
Belgium
India Sweden
Brazil
Iran Switzerland
Canada
Chile Italy Turkey
Japan United Kingdom
Denmark
Netherlands Yugoslavia
Finland
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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I
ISO/R 427 - 1965 (E)
IS0 Recommendation R 427 March 1965
CLASSIFICATION
OF TIN BRONZES AND SPECIAL TIN BRONZES
1. SCOPE
This IS0 Recommendation relates to the chemical composition and forms of semi-manufactured
products of the following wrought copper alloys:
Tin bronzes,
Special tin bronzes,
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 Tin bronzes
TABLE I
Maximum impurities
Average
Other elements density*
Sn P
Designation
Fe 1 Pb 1 Zn I Total kg/dm3
The
Cu Sn5 3.0-5.5 0-0.4 0.1 0.1 0.5 0.3 8.85
‘5-
Cu Sn7 5.5-7.5 0-0.4 0.1 0.1 0.5 0.3 8.80
main-
Cu Sn9 7.5-10.0 0-0.4 der 0.1 0.1
0.5 0.3 8.80
I * For information only.
3.2 Special tin bronzes
TABLE 2
Average
density*
Designation Sn Zn Pb P Cu
kg/dm3
The
-
Cu Sn4 Zn4 3.0-5.0 3.0-5.0 0-0.1 re- 0.1 0.1 0.3 8.8
0-0.4 main-
- O.
...