International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONWE~YHAPO~HAR OPrAHM3Al&lR n0 CTAH~APTM3A~MM.ORGANlSATlON INTERNATIONALE DE NORMALISATION
Steel - Hardness conversions
Aciers - Conversions de dureth
First edition - 1984-11-01
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ISO 4964:1984
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8054a991bc82/iso-4964-1984
-ii UDC 669.14 : 620.178.152.22/.42 Ref. No. IS0 4964-1984 (E)
Descriptors : steels, hardness tests, Brine11hardness, Vickers hardness, Rockwell hardness, conversion of units.
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Foreword
ISO. (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of preparing International
Standards is normally carried out through IS0 technical committees. Each member
body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, govern-
mental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council. They are approved in accordance with IS0 procedures requiring at
least 75 % approval by the member bodies voting.
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International Standard IS0 4964 was prepared by Technical Committee
17,
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ISO 4964:1984
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0 International Organization for Standardization, 1984
Printed in Switzerland
INTERNATIONAL STANDARD IS0 49644984 (E)
Steel - Hardness conversions
0 Introduction 2 Field of application
This International Standard makes comparisons between the 2.1 The conversion bands specified in this International Stan-
Vickers test and the Brine11and Rockwell tests. The Vickers and dard only apply to non-alloy and low-alloy steels for products of
Brine11 tests (see IS0 6566, and IS0 6507/l and IS0 6507/2) homogeneous structure and of thickness equal to or greater
are similar in that they both have a hardness scale based on than the figure given in the relevant test standard.
force per unit area whereas the Rockwell test (see ISO/R 80) is
based on measurement of depth of indentation after recovery. 2.2 In cases of dispute only the hardness value obtained from
the hardness test specified in the product standard should be
Whilst conversions dealing with hardness can never be used.
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mathematically exact and are therefore only approximate, it is
nevertheless of considerable value to be able to compare dif-
ferent hardness scales in a general way. 2.3 Converted hardness values shall not be used as a basis
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for rejection of the steel.
The shape of the indenter and hence the distribution of strain
will vary between the test methods, and the hardness ISO deter-
4964:1984
2.4 The conversion values specified in this International
mined by the three test methods will correspond to different
https://standards.iteh.ai/catalog/standards/sist/1e238884-80af-4c08-a2e2-
Standard shall only be used, for example, if suitable apparatus
degrees of work hardening. Thus the experimental correlation
8054a991bc82/iso-4964-1984
between hardnesses will vary from one steel to another.
is not available or if the necessary samples cannot be taken
from the test piece.
Additionally, there are known causes of anomalous values in
hardness testing which include : 3 References
a) variations in the finish of lower surface of hardness test ISO/R 80, Rockwell hardness test (B and C scales) for steel.
specimen;
I S 0 6506, Metallic materials - Hardness test - Brine/ test.
b) differences in the shape of the spherical type of dia-
mond indenters; IS0 6567, Metallic materials - Hardness test - Vickers test -
c) variation of hardness due to non-homogeneity of the Part 7 : HV 5 to HV 100.
steel.
Part 2 : HV 0,2 to less than HV 5.
1 Scope
4 Conversion bands
This International Standard specifies conversion bands for
hardness scales for steel. It compares hardness values for the Figures 1 to 6 give the limit lines for the containment of the ac-
following standard methods : cepted values for the following hardness conversion bands :
Vickers/ Brine11 (steel ball) HV-HBS HV-HBS figure 1.
Vickers/ Brine11 (hardmetal ball) HV-HBW HV-HBW figure 2
Vickers/ Rockwell scale A HV-HRA HV-HRA figure 3
Vickers/ Rockwell scale B HV-HRB HV-HRB figure 4
Vickers/ Rockwell scale C HV-HRC HV-HRC figure 5
Vickers/ Rockwell scale D HV-HRD HV-HRD figure 6
IS0 4964-1984 (E)
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ISO 4964:1984
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Figure 1 - Limit lines for the containment of accepted values for HV-HBS (steel ball)
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ISO 4964:1984
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550
HV
500
400 450 500 sio 660
HBW
Figure 2 - Limit lines for the containment of accepted values for HV-HBW (hardmetal ball)
IS0 4964-1984 (E)
.900
800
700
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HV
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Figure 5 - Limit lines for the containment of accepted values for HV-HFK
