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Ref. No.: IS0 / R 399 - 1964 (E)
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IS0
I NT ERN AT I ON AL
O RG A N I ZAT I O N FOR STA ND AR D 12 Afl O N
i
ISO ~ECOMMENDATION \
,
.
i i R 399
1
VICKERS. HARDNESS TEST
FOR COPPER 'AND COPPER ALLOYS
(Test loads'drorn 2.5 to 50 kgf)
4
1st ÉQTION
Novemb6 1964
i
COPYRIGHT RESERV@D
1
1,
The copyright ,hf IS0 Recommendations a4d IS0 Standards
belongs to O Member Bodies. Reprodfction of these
documents, i any country, may be authorizeQ therefore only
if"
al standards organization of that tountry, being
a member of ISO. 1,
\
t E
h
the only valid standard is the national
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 399, Vickers Hardness Test for Copper and Copper Alloys
(test loads from 2.5 to 5' kgf), was drawn iip 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 1958 and led, in 1961,
to the adoption of a Draft IS0 Recommendation.
In February 1962, this Draft IS0 Recommendation (No. 49'7) was circulated to all the
IS0 Member Bodies for enquiry. It was approved by the following Member Bodies:
Spain
Australia India
Bulgaria Italy Sweden
Burma Japan Switzerland
Canada Netherlands Turkey
United Kingdom
Denmark Poland
Finland Portugal U.S.S.R.
France Republic of South Yugoslavia
Germany Africa
Two Member Bodies opposed the approval of the Draft:
Belgium, U.S.A.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in November 1964, to accept it as an IS0 RECOMMENDATION.
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IS0 / R 399 - 1964 (E)
IS0 Recommendation November 1964
VICKERS HARDNESS TEST
FOR COPPER AND COPPER ALLOY§
(Test loads from 2.5 to 50 kgf)
1. SCOPE
This IS0 Recommendation applies to the Vickers hardness test for copper and copper alloys
using test loads within the range 2.5 to 50 kgf.
2. PRINCIPLE OF TEST
An indenter in the form of a right pyramid with a square base and specified angle between opposite
faces at the vertex is forced into the metal under a load F. The diagonal d of the indentation left
in the surface of the piece to be tested, after removal of the load, is measured.
The Vickers hardness is the ratio of the test load F (expressed in kilogrammes-force) divided
by the sloping area (expressed in square millimetres) of the indentation, considered as a right
pyramid with a square base, of diagonal d, and having at the vertex the same angle as the indenter.
The test is carried out at ambient temperature, unless otherwise specified.
-5-
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E
IS0 / R 399 - 1964 (E)
3. SYMBOLS AND DESIGNATIONS
FIG. 1
FIG. 2
..
1- Angle between opposite faces of the indenter (136")
2
F Test load, in kilogrammes-force
3 d Arithmetic mean of the two diagonals dl and d2 in mm
test load in kgf
I 4 1 HV I Vickers hardness =
area of indentation in mma
136"
2 F sin-
2 F
- -
= 1.854 - (approx.)
d2 d2
NOTE
The symbol HV is supplemented by an index indicating the load and the duration of loading when the latter
differs from the normal time.
Example: HV 10 = Vickers hardness measured under a load of 10 kgf, applied for 10 to 15 seconds;
HV 5/30 = Vickers hardness measured under a load of 5 kgf, applied for 30 seconds.
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SO/ R 399 - 1984 (E)
4. TESTING EQUIPMENT
4.1 The diamond indenter consists of a right pyramid
with a square base. The angle between opposite
faces of the indenter is 136" f 0.5".
4.1.1 All four faces of the indenter are equally
-11=002 mm mox'
inclined to the axis of the indenter (within
0.5") and meet in a point, i.e. ai,y line of
junction between opposite faces should be
less
...