ISO/R 192:1971

Title missing - Legacy paper document

General Information

• Status: Withdrawn
• Publication Date: 31-Dec-1970
• Technical Committee: ISO/TMBG - Technical Management Board - groups
• Drafting Committee: ISO/TMBG - Technical Management Board - groups
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 01-Jan-1976

Relations

• Consolidated By: ISO 9956-11:1996 - Specification and approval of welding procedures for metallic materials — Part 11: Welding procedure specification for laser beam welding
• Effective Date: 28-Feb-2023

Standards Content (Sample)

Ref. No. : ISO/R 192-1971 (E)
UDC 669.7.018 : 620.178.152.341
IS0
I N T E RN ATi O N A L O RG A N lZ AT1 O N FOR STAND AR D I Z AT1 O N
ISO FECOMMENDATION
\
LIGHT METALS AND THEIR ALLOYS
VICKERS HARDNESS TEST
(TEST LOADS FROM 1 TO 100 kgf)
2nd EDITION
Octobek 197 1
This second edition supersedes the first edition
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reprbduction of these
documents, in any country, may be authoriàed therefore only
by the national standards organization of thit country, being
a member of ISO.
For each individual eountry the only valid standard is the national standard of that country.
i
Printed in Switzerland
Russian. Copies to be obtained through the national standards organizations.

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BRIEF HISTORY
The IS0 Recommendation R 192, Vickcrs hardness test for light rrietals arid their allo.vs, wa\ drawn up by Tcchnical
Committee ISO/TC 79. Light metals and their alloys, the Secretariat of which i\ held by the Aiwciation 1:rançaise de Normalisatior.
(AFNOR).
Work on this question led to the adoption of Draft IS0 Recommendation No. 265, uliit~h was circulated to all the IS0 Membci
Bodies for enquiry in December 1958. It was approved by 74 Member Bodie\. Onc Mcniiicr Body oppo\cd the approval of the Draft
(Romania).
IS0 Recommendation \va\ then iubniitted by cori-c\pondciicc to ilic IS0 Council. which dccidcd to accept it a\ an
This Draft
IS0 RECOMMENDATION.
BRIEF HISTORY RELATING TO THE 2nd EDITION
Work on the revision of IS0 Recommendation R 192-1961 began in 1966 and led to the adoption of Draft
IS0 Recommendation No. 2086. In July 1970. this Draft IS0 Recommendation was submitted to all IS0 Member
Bodies for enquiry. it was approved, subject to a few modifications of an editorial nature, by the following Member
Bodies :
Belgium Iran
Romania
Canada I re 1 and
South Africa, Rep. of
Czechoslovakia Israel Spain
Denmark Japan Sweden
Finland
Korea, Rep. of Switzerland
France
Net herlands Thailand
Ger many New Zealand
U.A.R.
Greece Norway
United Kingdom
Hungary Poland
U.S.A.
India Portugal U.S.S.R.
No Member Body opposed the approval of the Draft
This Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council, which decided
to accept it as the second edition of IS0 Recommendation R 192. The title of that Recommendation has been
modified to read as follows Light metals and îheir alloys - Vickers hardness test (Test loads from 1 to 1 O0 kgf).
This edition (second edition) supersedes the first edition of IS0 Recommendation R 192-1961

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-5 -
ISO/R 192-1971 (I
IS0 Recommendation R 192
October 1971
LIGHT METALS AND THEIR ALLOYS
VICKERS HARDNESS TEST
(TEST LOADS FROM 1 TO 100 kgf)
1. SCOPE
This IS0 Recommendation describes the Vickers hardness testing of light metals and their alloys with test loads
from 1 to 100 kgf.
2. PRINCIPLE
The test consists in forcing an indenter, in the form of a right pyramid with a square base and specified angie
a between opposite faces at the vertex, under a load F, into the metal, and measuring the diagonal d of the
indentation left in the surface after removal of the load.
The Vickers hardness, HV, is the quotient obtained by dividing the test load F (expressed in kilogrammes-force)
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.
3. SYMBOLS AND DESIGNATIONS
F
FIGURE 1 FIGURE 2
Symbol Designation
Angle between opposite faces at the vertex of the pyramidal indenter = 136 f 0.5'
Test load, in kilogrammes-force
Arithmetic mean of the two diagonals, d, and d2, in millimetres
136"
2F sin -
F
Test load -
HV Vickers hardness = - * = 1.854 - (approx.)
Area of indentation d2 dz
NOTE. ~ The symbol HV is supplemented by an index indicating the load and a further index indicating the duration of loading,
when the latter differs from 10 to 15 seconds, which is the normal time of application.
Examples
HVlO = Vickers hardness, measured under a load of 10 kgf, applied for 10 to 15 seconds,
= Vickers hardness, measured under a load of 10 kgf, applied for 20 seconds.
HV10/20

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ISO/R 192-1971 (E
4. INDENTER
The indenter consists of a diamond in the form of a right pyramid with a square base (see Figure 1). The angle
at the vertex between op
...