ISO/R 191:1971

Brinell hardness test for light metals and their alloys

Essai de dureté Brinell pour les métaux légers et leurs alliages

General Information

• Status: Withdrawn
• Publication Date: 30-Sep-1971
• Withdrawal Date: 30-Sep-1971
• ICS: 77.040.10 - Mechanical testing of metals
• Technical Committee: ISO/TC 164/SC 3 - Hardness testing
• Drafting Committee: ISO/TC 164/SC 3 - Hardness testing
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 01-Sep-1981

Relations

• Revised: ISO 6506:1981 - Metallic materials — Hardness test — Brinell test
• Effective Date: 15-Apr-2008

Standards Content (Sample)

UDC 669.7.0
Ref. No. : lSO/ R 191-1961 (E)
IS0
I N T ERN AT I O N A L ORGAN IZ AT1 O N FOR STAND AR D I Z AT I O N
IS0 RECOMMENDATION
R 191
BRINELL HARDNESS TEST FOR LIGHT METALS
AND THEIR ALLOYS
1st E D IT1 O N
March 1961
\-
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
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 191, Brinell Hardness Test for Light Metals and their
Alloys, was drawn up by Technical Committee ISO/TC 79, Light Metals and their Alloys,
the Secretariat of which is held by the Association Française de Normalisation (AFNOR).
Work on this question by the Technical Committee began in 1955 and led in 1958 to
the adoption of a Draft IS0 Recommendation.
In December 1958, this Draft IS0 Recommendation (No. 264) was circulated to all
the IS0 Member Bodies for enquiry. It was approved by the following Member Bodies:
Austria India Portugal
Brazil Ireland Spain
Burma Israel Sweden
Canada Italy Switzerland
Finland Japan United Kingdom
France Netherlands U.S.S.R.
Germany New Zealand Yugoslavia
Hungary
Poland
Two Member Bodies opposed the approval of the Draft :
Belgium Romania
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
<- Council, which decided, in March 1961, to accept it as an IS0 RECOMMENDATION.
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IS0 / R 191 - 1981 (E)
IS0 Recommendation R 191 March 1961
BRINELL HARDNESS TEST FOR LIGHT METALS
AND THEIR ALLOYS
1. PRINCIPLE OF TEST
The test consists in forcing a steel ball of diameter D, under a load F, into the test piece, and
measuring the diameter d of the indentation left in the surface after removal of the load.
The Brinell hardness HB is the ratio of the test load F (expressed in kilogrammes-force) to
the curved surface area of the indentation (expressed in square millimetres) which is assumed to
be spherical and of diameter D.
2. SYMBOLS AND DESIGNATIONS
Designation
I
1 D Diameter of the ball, in millimetres
2 F Test load, in kilogrammes-force
Diameter of indentation, in millimetres
3 d
4 HB Brinell hardness
test load
- -
surface area of indentation
2F
- -
x D (D - D2 - d2 1
5 h Depth of indentation, in millimetres
Nom
The Brinell hardness is denoted by the symbol HB supplemented by an index indicating the test conditions in the
following order:
diameter of ball,
load,
duration of loading.
Example: HB 5/250/30 = Brinell hardness
measured with a ball of 5 mm diameter and
with a load of 250 kgf applied for 30 s.

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I
IS0 / R 191 - 1961 (E)
3. TESTING EQUIPMENT
3.1 The nominal diameter of the ball should be not less than 1 mm, unless otherwise specified.
A 10 mm ball is preferred, when the thickness of the test piece permits. No diameter of
the ball should differ from the nominal diameter by more than the following:
Diameter of ball
Millimetres
I
from 1 to 3 & 0.003 5
over 3 to 6 f 0.004
over 6 to 10 k 0.004 5
3.2
The ball is of hardened steel** with a hardness of at least 850 HV (taking into account
the curvature of the ball, when testing); it should be polished and free from surface
defects. Any ball showing any deformation after the test greater than the tolerance
specified under clause 3.1 above, or any surface defect, should be rejected, and the
corresponding test discarded.
4. TEST REQUIREMENTS
The test is carried out at ambient temperature, unless otherwise specified.
4.1
4.2 The ball is placed against the surface of th
...

I
CDU 669.7.0
IS0
I N T ERN AT I O N AL E DE N O RM A LI S AT1 O N
O RG A N I SAT I O N
RECOMMANDATION IS0
R 191
ESSAI DE DURETE BRINELL POUR LES METAUX LEGERS
ET LEURS ALLIAGES
1 bre E D IT1 O N
Mars 1901
REPRODUCTION INTERDITE
Le droit de reproduction des Recommandations IS0 et des Nonnes
IS0 est la propri6te des Comites Membres de I'ISO. En CO&
quence, dans chaque pays, la reproduction de ces documents ne
peut être autorisk que par l'organisation nationale de normali-
sation de ce pays, membre de 1'ISO.
Seules les normes nationales sont valables dans leurs pays respectifs.
Imprim6 en Suisse
Ce document est 6galement 6dit6 en anglais et en russe, I1 peut &re obtenu auprhs des organisations
nationales de normalisation.

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. .
. I.

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HISTORIQUE
La Recommandation ISO/R 191, Essai de duretd Brinellpour les mkaux lbgers et leurs
alliages, a 6t6 6laborde par le Comitd Technique ISO/TC 79, Mktaux lkgers et leurs alliages,
dont le Secrdtariat est assure par l’Association Française de Normalisation (AFNOR).
Les travaux relatifs il cette question furent entrepris par le Comitt5 Technique en 1955
et aboutirent en 1958 il l’adoption d’un Projet de Recommandation ISO.
En ddcembre 1958, ce Projet de Recommandation IS0 (No 264) fut soumis il l’enquête
de tous les Comitb Membres de 1’ISO. I1 fut approuvd par les Comitds Membres suivants:
Allemagne Hongrie Pologne
Inde Portugal
Autriche
Birmanie Irlande Royaume-Uni
Suède
Br6sil haEl
Suisse
Canada Italie
Japon U.R.S.S.
Espagne
Yougoslavie
Finlande Nouvelle-Zdlande
France Pays-Bas
Deux Comitds Membres se dbclar6rent oppost5s A l’approbation du Projet:
Belgique Roumanie
Le Projet de Recommandation IS0 fut alors soumis par correspondance au Conseil
de I’ISO qui dbcida, en mars 1961, de l’accepter comme RECOMMANDATION ISO.

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WO/ R 191 -ISM (F)
Recommandation IS0 ~
R 191 Mars 1961
I
ESSAI DE DURETE POUR LES M~TAUX LEGERS
ALLIAGES
I 1. PRINCIPE DE L’ESSAI
L’essai consiste a imprimer da s la piece A essayer une bille en acier de diambtre D, sous une
charge F, et & mesurer le diam tre d de l’empreinte laisde sur la surface, aprbs enlhement de
;1 I
la charge.
La duret6 Brinell HB est le quofient de la charge d’essai F (exprim6e en kilogrammes-force) par
l’aire (exprimbe en millimbtres cqrr6s) de l’empreinte, consid6rbe comme une calotte sph6rique au
diambtre de sphère D.
,
21 SYMBOLES ET DESIGNATIONS
I
Nomdro sg.mbolss Desimtiom 1
repare
I
l
Diambtre de la bille, en millimbtres
1 D
2 F Charge d’essai, en kilogrammes-force
Diambtre de l’empreinte, en millimhtres
3 d
4 HB ’ Duret6 Brinell
charge d’essai
- -
I
aire de l’empreinte
l
2F
- -
l
D (D - 1/ DB -fi
I
5 h Profondeur de l’empreinte, en millim8tres
I
I
-I?-);-
i
NOTE
compl6t6 par un indice rappelant les conditions de l’essai dans
La duret6 Brinell est
l’ordre suivant:
charge,
dur& d’adplication de la charge.
Exemple: HB 5/250/30 =
de 5 mm de diambtre,
250 kgf appliqub pendant 30 S.
1
-5-

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lSO/ R 181-1MI (F)
I
3. aQUIPEMENT DE L’ESSAI
3.1 Le diamètre nominal e la bille ne descendra pas au-dessous de 1 mm, sauf specification
contraire. Si l’&paisse r de la pièce d essayer le permet, le diamktre de 10 mm sera le dia-
mètre prefdrentiel. Aqcun e dipmètre de la bille ne différera du diamktre nominal de plus
que les tolerances suivantes :
Diamatre de la bille Tol6rmces *
Millimbtres Millimbtres
I
,
’ de 1 jusqu’d 3 f 0,003 5
plus de 3 jusqu’d 6 f 0,004
I plus de 6 jusqu’d 10 f 0,004 5
I
3.2 La bille est en acier t?empk** d’une durete d’au moins 850 HV (pour la determination
de cette durete, il y lieu de tenir compte de la courbure de la bille); elle doit être polie
8
et sans defaut de surface. 7 Toute bille, presentant après l’essai une deformation depassant
la t
...