IS 1500 (Part 2) : 2013

ISO 6506-2 : 2005

(Superseding IS 2281 : 2005)

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Indian Standard

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METALLIC MATERIALS —

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BRINELL HARDNESS TEST
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PART 2 VERIFICATION AND CALIBRATION OF TESTING MACHINES

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( Fourth Revision )
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ICS 77.040.10
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© BIS 2013
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

July 2013 Price Group 7

Mechanical Testing of Metals Sectional Committee, MTD 03

NATIONAL FOREWORD

This Indian Standard (Part 2) (Fourth Revision) which is identical with ISO 6506-2 : 2005 ‘Metallic
materials — Brinell hardness test — Part 2: Verification and calibration of testing machines’ issued
by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian
Standards on the recommendation of the Mechanical Testing of Metals Sectional Committee and
approval of the Metallurgical Engineering Division Council.

This revision has been undertaken to harmonize it with the latest developments that have taken
place at international level. The committee has now decided to adopt this standard under dual numbering
system and make it align with ISO 6506, which is published in four parts. Similarly, this standard is
also published in four parts. The other parts in this series are:

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Part 1 Test method

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Part 3 Calibration of reference blocks ma
Part 4 Table of hardness values

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This standard superseding IS 2281 : 2005 ‘Method for verification of Brinell hardness testing machines
(third revision)’.
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The text of ISO Standard has been approved as suitable for publication as an Indian Standard without
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deviations. Certain terminology and conventions are, however, not identical to those used in Indian
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Standards. Attention is particularly drawn to the following:

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a) Wherever the words ‘International Standard’ appear, referring to this standard, they should be
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read as ‘Indian Standard’.

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b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice
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is to use a point (.) as the decimal marker.

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In this adopted standard, reference appears to certain International Standards for which Indian
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Standards also exist. The corresponding Indian Standards which are to be substituted in their respective
places are listed below along with their degree of equivalence for the editions indicated:
International Standard Corresponding Indian Standard Degree of Equivalence
ISO 376 : 2004 Metallic materials — IS 4169 : 1988 Method for calibration Technically Equivalent
Calibration of force-proving of force-proving instruments used for
instruments used for the verificationthe verification of uniaxial testing
of uniaxial testing machines machines (first revision)
ISO 6506-1 : 2005 Metallic materials IS 1500 (Part 1) : 2013 Metallic Identical
— Brinell hardness test — Part 1: materials — Brinell hardness test:
Test method Part 1 Test method (fourth revision)
ISO 6506-3 : 2005 Metallic materials IS 1500 (Part 3) : 2013 Metallic do
— Brinell hardness test — Part 3: materials — Brinell hardness test:
Calibration of reference blocks Part 3 Calibration of reference blocks
(fourth revision)
ISO 6507-1 : 2005 Metallic materials IS 1501 (Part 1) : 2013 Metallic do
— Vickers hardness test — Part 1: materials — Vickers hardness test:
Test method Part 1 Test method (fourth revision)

In reporting the result of a test or analysis made in accordance with this standard, if the final value,
observed or calculated, is to be rounded off, it shall be done in accordance with IS 2 : 1960 ‘Rules for
rounding off numerical values (revised)’.
 IS 1500 (Part 2) : 2013
ISO 6506-2 : 2005

Indian Standard
METALLIC MATERIALS —
BRINELL HARDNESS TEST
PART 2 VERIFICATION AND CALIBRATION OF TESTING MACHINES

( Fourth Revision )

1 Scope
This part of ISO 6506 specifies a method of verification and calibration of testing machines used for
determining Brinell hardness in accordance with ISO 6506-1.

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It specifies a direct method for checking the main functions of machine operation and an indirect method

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suitable for the overall checking of the machine. The indirect method may be used independently for periodic

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routine checking of machine operation while in service.
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If a testing machine is also to be used for other methods of hardness testing, it should be verified
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independently for each method.

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This part of ISO 6506 is also applicable to portable hardness testing machines.
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2 Normative references
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The following referenced documents are indispensable for the application of this document. For dated
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references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
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ISO 376:2004, Metallic materials — Calibration of force-proving instruments used for the verification of
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uniaxial testing machines

ISO 6506-1:2005, Metallic materials — Brinell hardness test — Part 1: Test method

ISO 6506-3, Metallic materials — Brinell hardness test — Part 3: Calibration of reference blocks

ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method

3 General conditions
Before a Brinell hardness testing machine is verified, the machine shall be checked to ensure that it is
properly set up in accordance with the manufacturer's instructions.

Especially, it should be checked that:

a) the plunger holding the ball slides correctly in its guide;

b) the ball-holder with a ball (from a lot verified in accordance with 4.3) is firmly mounted in the plunger;

c) the test force is applied and removed without shock, vibration or overrun and in such a manner that the
readings are not influenced;

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IS 1500 (Part 2) : 2013
ISO 6506-2 : 2005

d) if the measuring system is integrated into the machine:

⎯ the change from removing the test force to measuring mode does not influence the readings;

⎯ the illumination does not affect the readings; and

⎯ the centre of the indentation is in the centre of the field of view, if necessary.

4 Direct verification

4.1 General

4.1.1 Direct verification should be carried out at a temperature of (23 ± 5) °C. If the verification is made
outside this temperature range, this shall be reported in the verification report.

4.1.2 The instruments used for verification and calibration shall be traceable to national standards.

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4.1.3 Direct verification involves:

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a) the calibration of the test force;
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b) the verification of the indenter ball;

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c) the calibration of the measuring system;
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d) the verification of the testing cycle.

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4.2 Calibration of the test force

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4.2.1 Each test force shall be measured within the working range of the testing machine. Whenever
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applicable, this shall be done at no less than three positions of the plunger uniformly spaced throughout its
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range of movement during testing.

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4.2.2 Three measurements shall be made for each force at each position of the plunger. Immediately before
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each measurement is taken, the plunger shall be moved in the same direction as during testing.

4.2.3 The force shall be measured by one of the following two methods:

⎯ by means of a force-proving instrument in accordance with ISO 376:2004 class 1, or

⎯ by balancing against a force, accurate to ± 0,2 %, applied by means of calibrated masses or another
method with the same accuracy.

4.2.4 Each measurement of a force shall be within ± 1,0 % of the nominal test force, as defined in
ISO 6506-1.

4.3 Verification of the indenter ball

4.3.1 The indenter consists of a ball and an indenter holder. The verification applies only to the ball.

4.3.2 For the purpose of verifying the size and the hardness of the balls, a sample selected at random from
a batch shall be tested. The balls verified for hardness shall be discarded.

4.3.3 The balls shall be polished and free from surface defects.

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 IS 1500 (Part 2) : 2013
ISO 6506-2 : 2005

4.3.4 The user shall either measure the balls to ensure that they meet the following requirements or shall
obtain balls from a supplier certifying that the following conditions are met.

4.3.4.1 The diameter shall be determined by taking the mean value of not less than three single values of
diameter measured at different positions on the ball. No single value shall differ from the nominal diameter by
more than the tolerance given in Table 1.

Table 1 — Tolerances for different ball diameters

Ball diameter Tolerance

mm mm
10 ± 0,005
5 ± 0,004
2,5 ± 0,003
1 ± 0,003

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4.3.4.2
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The characteristics of the hardmetal balls shall be as follows.

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a) Hardness: The hardness shall be not less than 1 500 HV , when determined using a test force of at least
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4,903 N, in accordance with ISO 6507-1. The hardmetal ball may be tested directly on this spherical
surface or by sectioning the ball and testing on the ball interior.
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Density: ρ = (14,8 ± 0,2) g/cm3.

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b)
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The following chemical composition is recommended:

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⎯
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tungsten carbide (WC) balance;

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⎯
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total other carbides 2,0 %;

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⎯
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cobalt (Co) 5,0 % to 7,0 %.

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4.4 Calibration of the measuring system

indentation to within ± 0,5 %.

4.4.1 The scale of the measuring system shall be graduated to permit estimation of the diameter of the

4.4.2 The measuring system shall be verified by measurements made on an object micrometer at a
minimum of five intervals over each working range. The maximum error of each interval shall not exceed
0,5 %.

4.4.3 When measuring a projected area, the maximum error shall not exceed 1 % of the area.

4.4.4 Hand held microscopes should be calibrated in accordance to the procedure of this standard and the
tolerances of the manufacturer.

4.5 Verification of the testing cycle

uncertainty less than ± 1,0 s.

The testing cycle shall conform with the testing cycle specified in ISO 6506-1 and shall be timed with an

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IS 1500 (Part 2) : 2013
ISO 6506-2 : 2005

5 Indirect verification

5.1 Indirect verification should be carried out at a temperature of (23 ± 5) °C by means of reference blocks
calibrated in accordance with ISO 6506-3. If the verification is made outside of this temperature range, this
shall be reported in the verification report.

The test and bottom surfaces of the reference blocks and the surfaces of indenters shall not contain any
additives or corrosion products.

5.2 On each reference block, the reference indentation shall be measured. For each block, the difference
between the mean measured value and the certified mean diameter shall not exceed 0,5 %.

5.3 The testing machine shall be verified for each test force and for each size of ball used. For each test
force, at least two reference blocks shall be selected from the following hardness ranges:

⎯ u 200 HBW

⎯ 300 u HBW u 400

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⎯

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W 500 HBW
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The two reference blocks shall be taken from different hardness ranges, if possible.
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above-mentioned ranges (for 0,102 × F/D2 = 5 or 10), the verification may be carried out with only one reference block
NOTE When the hardness test in question makes it impossible to reach the higher hardness range defined in the
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from the lower hardness range.

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5.4 On each reference block, five indentations shall be uniformly distributed over the test surface and
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measured. The test shall be made in accordance with ISO 6506-1.

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5.5 For each reference block, let d1, d2, d3, d4, d5 be the mean values of the measured diameters of the
indentations, arranged in increasing order of magnitude, and
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d1 + d 2 + d 3 + d 4 + d 5
d =
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(1)
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5.6 The repeatability r of the testing machine under the particular verification conditions is calculated as:

r = d 5 − d 1. (2)

The repeatability, expressed as a percentage of d , is calculated as:

d 5 − d1
rrel = 100 × , in % (3)
d

5.7 The repeatability of the testing machine is satisfactory when rrel is as specified in Table 2.

5.8 The error, E, of the testing machine under the particular verification conditions is calculated by the
following formula:

E = H − Hc (4)

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 IS 1500 (Part 2) : 2013
ISO 6506-2 : 2005

The percent error, Erel, is calculated by the following equation:

H − Hc
E rel = 100 × , in % (5)
Hc

where

Hc is the reported certified hardness value of the reference block.

The error of the testing machine, expressed as a percentage of the specified hardness of the reference block,
shall not exceed the values given in Table 2.

Table 2 — Repeatability and error of the testing machine

Hardness of the reference block Permissible repeatability rrel, Permissible error, Erel,
of the testing machine of the testing machine
HBW % % of H

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± 3,0

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u 125 ma 3,0

125 < HBW u 225 ± 2,5

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2,5

> 225
2,0 ± 2,0
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HBW: Brinell hardness.

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5.9 The determination of the uncertainty of measurement of the calibration results of the hardness testing
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machine is given in Annex A.

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6 Intervals between verifications

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The specifications for the direct verifications are given in Table 3.

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Indirect verification shall be performed at least once every 12 months and after a direct verification has been
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performed.

Table 3 — Direct verifications of hardness testing machines

Measuring
Requirements of verification Force Test cycle Indenter a
system

before setting to work first time x x x x

after dismantling and reassembling,
if force, measuring system or test x x x
cycle are affected

failure of indirect verification b x x x

indirect verification > 14 months ago x x x

a In addition, it is recommended that the indenter be directly verified after two years of use.
b Direct verification of these parameters may be carried out sequentially (until the machine passes indirect verification) and is not
required if it can be demonstrated (e.g. by tests with a calibrated indenter) that the indenter was the cause of the failure.

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IS 1500 (Part 2) : 2013
ISO 6506-2 : 2005

7 Verification report/calibration certificate

The verification report/calibration certificate shall include the following information:

a) a reference to this part of ISO 6506;

b) method of verification (direct and/or indirect);

c) identification data for the hardness testing machine;

d) means of verification (reference blocks, elastic proving devices, etc.);

e) diameter of the ball indenter and test force;

f) verification temperature;

g) result obtained;

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h) date of verification and reference to the verification institution;

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i) uncertainty of the verification results.
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 IS 1500 (Part 2) : 2013
ISO 6506-2 : 2005

Annex A
(informative)

Uncertainty of measurement of the calibration results

of the hardness testing machine

The metrological chain necessary to define and disseminate hardness scales is shown in Figure C.1 in
ISO 6506-1:2005.

A.1 Direct calibration of the hardness testing machine

A.1.1 Calibration of the test force

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The combined relative standard uncertainty of the test force calibration is calculated according to the following

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equation: ma
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u F = u F2 RS + u F2 HTM (A.1)
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where
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uFRS is the relative uncertainty of measurement of the force transducer (from calibration certificate);
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uFHTM is the relative standard uncertainty of the test force generated by the hardness testing machine.
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The uncertainty of measurement of the reference instrument, force transducer, is indicated in the
corresponding calibration certificate. The influence quantities, like
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⎯ temperature dependence,
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⎯ long-term stability, and

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⎯ interpolation deviation,

should be considered for critical applications. Depending on the design of the force transducer, the rotational
position of the transducer, related to the indenter axis of the hardness testing machine, should be considered.

EXAMPLE

Uncertainty of measurement of the force transducer (from calibration certificate): UFRS = 0,12 % (k = 2)

Calibration value of the force transducer FRS = 1 839 N

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IS 1500 (Part 2) : 2013
ISO 6506-2 : 2005

Table A.1 — Results of the test force calibration

Series 1 Series 2 Series 3 Mean value Relative Relative

deviation standard
Number of height measurement

∆Frel
position for test force uncertainty
calibration F1 F2 F3 F uFHTM

N N N N % %

1 1 835,0 1 836,6 1 837,9 1 836,5 − 0,14 0,05

2 1 834,3 1 835,7 1 837,5 1 835,8 − 0,17 0,05
3 1 832,2 1 839,5 1 834,1 1 835,3 − 0,20 0,12

where

FRS − F
∆Frel = (A.2)

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F

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u F HTM = ⋅ ,( n = 3)
s F ,i
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(A.3)

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F n
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sF,i is the standard deviation of the test force indication values in the i-th height position
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In Table A.2, the maximum value of uFHTM from Table A.1 is used.
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Table A.2 — Calculation of the uncertainty of measurement of the test force

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Quantity Estimated Relative limit Distribution Relative Sensitivity Relative

value values type standard coefficient uncertainty
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measurement contribution
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uncertainty
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Xi xi ai u(xi) ci urel(H)

6,0 × 10−4 6,0 × 10−4

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uFRS 1 839 N Normal 1

uFHTM 1 839 N Normal 12,0 × 10−4 1 12,0 × 10−4

Relative combined standard uncertainty uF 13,3 × 10−4
Relative expanded uncertainty of measurement UF (k = 2) 2,7 × 10−3

Table A.3 — Calculation of the maximum relative deviation of the test force including
the uncertainty of measurement of the reference instrument

Relative deviation of test force Expanded relative measurement Max. relative deviation of test force
uncertainty of test force including measurement uncertainty
of reference instrument
∆Frel UF ∆Fmax

% % %

0,20 0,27 0,47

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 IS 1500 (Part 2) : 2013
ISO 6506-2 : 2005

where

∆Fmax = I∆Frel I + UF (A.4)

of the reference instrument specified in 4.2, amounting to ± 1,0 % is complied with.

The result of the example means that the deviation of the test force, including the uncertainty of measurement

A.1.2 Calibration of the optical measuring system

The combined relative standard uncertainty of the reference instrument for the measuring system is calculated
as follows:

u L = u L2 RS + u ms
2
+ u L2 HTM (A.5)

where

uLRS is the relative uncertainty of measurement of object micrometer (reference standard) from the

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calibration certificate for k = 1;

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ums
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is the relative uncertainty of measurement due to the resolution of the measuring system;

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uLHTM is the relative standard uncertainty of measurement of the hardness testing machine.
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The uncertainty of measurement of the reference instrument for the optical measuring system, the object
micrometer, is indicated in the corresponding calibration certificate. The influence quantities, like
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⎯ temperature dependence,
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⎯ long-term stability, and

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⎯ interpolation deviation,
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do not exert an essential influence on the uncertainty of measurement of the object micrometer.
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EXAMPLE
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Uncertainty of measurement of the object micrometer: ULRS = 0,000 5 mm (k = 2)

Resolution of the measuring system: δms = 0,1 µm

Table A.4 — Results of the calibration of the measuring system

Indication value of the Series 1 Series 2 Series 3 Mean value Relative Relative
object micrometer deviation standard
measurement

∆Lrel
uncertainty
LRS L1 L2 L3 L uLHTM

mm mm mm mm mm % %

1,0 1,002 1,003 1,001 1,002 0,20 0,06

2,0 2,001 2,003 2,001 2,002 0,08 0,03
3,0 3,002 3,002 3,001 3,002 0,06 0,01
4,0 4,001 4,003 4,002 4,002 0,05 0,01

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IS 1500 (Part 2) : 2013
ISO 6506-2 : 2005

where

u L HTM = ⋅
s L,i 1
, (n=3) (A.6)
L n

L − L RS
∆L rel = (A.7)
LRS

sL,i is the standard deviation of the length indication values for the i-th indication value of the object
micrometer.

Table A.5 — Calculation of the uncertainty of measurement of the measuring system

Quantity Estimated Limit value Distribution Relative Sensitivity Relative

value type standard coefficient uncertainty
measurement contribution
uncertainty

rv
Xi xi ai u(xi) ci ui(H)

2,5 × 10−4 2,5 × 10−4

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uLRS 1,0 mm Normal 1
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± 1,0 × 10−4 2,9 × 10−5 2,9 × 10−5

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ums 1,0 mm Rectangular 1

6,0 × 10−4 6,0 × 10−4

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uLHTM 1,0 mm Normal 1
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Relative combined uncertainty of measurement, uL 0,06
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Relative expanded uncertainty of measurement, UL (k = 2), % 0,13

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Table A.6 — Calculation of the maximum relative deviation of the measuring system
including the uncertainty of measurement of the length reference instrument
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Test length Relative deviation of the Expanded relative Maximum relative

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measuring system uncertainty of deviation of measuring

measurement system including
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measurement uncertainty
of length reference
instrument
LRS ∆Lrel UL ∆Lmax

% % %

1,0 mm 0,20 0,13 0,33

where

∆Lmax = I∆LrelI + UL (A.8)

measurement of the length reference instrument specified in 4.4 amounting to ± 0,5 %, is complied with.
The result of the example means that the deviation of the measuring system, including the uncertainty of

A.1.3 Verification of the indenter

The indenter consisting of indenter tip (ball) and holder cannot be verified and/or calibrated in-site. A valid
calibration certificate of an accredited calibration laboratory shall exist which confirms the geometrical
deviations, the physical properties and the chemical composition of the indenter (see 4.3).

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ISO 6506-2 : 2005

A.1.4 Verification of the test cycle

In 4.5 the permissible deviation for every section of the test cycle is stipulated as ± 0,5 s. While measuring
with a usual time measuring device (stopwatch), the uncertainty of measurement can be indicated as 0,1 s.
Therefore, an estimation of the uncertainty of measurement is not necessary.

A.2 Indirect verification of the hardness testing machine

NOTE In this annex, the index “CRM (Certified Reference Material)” means, according to the definitions of the
hardness testing standards, “Hardness Reference Block”.

By indirect verification with hardness reference blocks, the overall function of the hardness testing machine is
checked, and the repeatability, as well as the deviation of the hardness testing machine from the real
hardness value, are determined.

The uncertainty of measurement of the indirect verification of the hardness testing machine follows from the
equation:

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u HTM = u CRM + u CRM − D + u H + u ms

m
2 2 2 2 ma (A.9)

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where
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uCRM is the calibration uncertainty of the hardness reference block according to the calibration
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certificate for k = 1;
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uCRM-D is the hardness change of the hardness reference block since its last calibration due to drift
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(negligible for use of the hardness reference block complying with the standard);
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uH is the standard uncertainty of hardness testing machine when measuring CRM;

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ums is the standard uncertainty due to the resolution of the hardness testing machine.
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EXAMPLE
Hardness reference block HCRM = (100,0 ± 1,0) HBW 2,5/187,5
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Uncertainty of measurement of the hardness reference block uCRM = 0,5 HBW 2,5/187,5

Resolution of the hardness testing machine δms = 0,5 µm

Table A.7 — Results of the indirect verification

Number Measured indentation diameter, d Calculated hardness value, H

mm HBW a

1 1,462min 101,1max

2 1,469 100,1

3 1,472max 99,6min

4 1,471 99,8
5 1,468 100,3

Mean value, H 1,468 4 100,2

Standard deviation, sH 0,60

a HBW: Brinell hardness.

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IS 1500 (Part 2) : 2013
ISO 6506-2 : 2005

b = H − H CRM
b = 100 , 2 − 100 ,0 = 0 , 2 HBW
(A.10)

t ⋅ sH
uH = (A.11)
n
For t = 1,14, n = 5 and sH = 0,60 HBW follows:

uH = 0,31 HBW

A.3 Budget of uncertainty of measurement

Table A.8 — Budget of uncertainty of measurement

Quantity Estimated value Standard Distribution type Sensitivity Uncertainty

uncertainty of coefficient contribution
measurement

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Xi xi u(xi) ci ui(H)

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uCRM 100,0 HBW 0,50 HBW Normal 1,0 0,50 HBW

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uH 0 HBW 0,31 HBW Normal 1,0 0,31 HBW
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−152,2 HBW/mm a −0,02 HBW

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ums 0 HBW 0,000 14 mm Rectangular
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uCRM–D 0 HBW 0 HBW Triangular 1,0 0 HBW
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Combined uncertainty of measurement uHTM 0,59 HBW

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Expanded uncertainty of measurement UHTM (k = 2) 1,17 HBW

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HBW: Brinell hardness

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a The sensitivity coefficient follows from:

∂H H D + D2 − d 2
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=− ⋅
ca

∂d
(A.12)
d D2 − d 2
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ns

for H = 100,0 HBW, D = 2,5 mm, d = 1,469 mm.

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Table A.9 — Maximum deviation of the hardness testing machine

including the uncertainty of measurement

Measured hardness on the Expanded uncertainty Deviation of the testing Maximum deviation
hardness testing machine of measurement machine when calibrating of the testing machine
with the reference block including uncertainty

∆HHTMmax
of measurement
H UHTM b
HBW HBW HBW

100,2 HBW 2,5/187,5 1,2 0,2 1,4

HBW: Brinell hardness

where

∆ H HTMmax = U HTM + b = 1,2 + 0,2 = 1,4 HBW (A.13)

the uncertainty of measurement of the testing machine specified in Clause 5 amounting to ± 3 HBW, is
The result of the example above means that the permissible limit deviation of the testing machine, including

complied with.

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 IS 1500 (Part 2) : 2013
ISO 6506-2 : 2005

Bibliography

[1] SAWLA, A. Uncertainty of measurement in the verification and calibration of the force-measuring
systems of testing machines, Proceedings of the Asia-Pacific symposium on measurement of force,
mass and torque (APMF), Tsukuba, Japan, November 2000

[2] W EHRSTEDT, A. and PATKOVSZKY, I. News in the field of standardization about verification and
calibration of materials testing machines, May 2001, EMPA Academy, 2001

[3] GABAUER, W., Manual codes of practice for the determination of uncertainties in mechanical tests on
metallic materials, The estimation of uncertainties in hardness measurements, Project No. SMT4-
CT97-2165, UNCERT COP 14:2000

[4] POLZIN, T. and SCHWENK D. Method for Uncertainty Determination of Hardness Testing; PC File for
Determination, Materialprüfung 44 (2002) 3, pp. 64 - 71

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Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote
harmonious development of the activities of standardization, marking and quality certification of goods
and attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any form
without the prior permission in writing of BIS. This does not preclude the free use, in course of imple-
menting the standard, of necessary details, such as symbols and sizes, type or grade designations.
Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also
reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that
no changes are needed; if the review indicates that changes are needed, it is taken up for revision. Users
of Indian Standards should ascertain that they are in possession of the latest amendments or edition by

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referring to the latest issue of ‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

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This Indian Standard has been developed from Doc No.: MTD 03 (5123).

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BUREAU OF INDIAN STANDARDS

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Headquarters:
Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002
Telephones: 2323 0131, 2323 3375, 2323 9402 Website: www.bis.org.in

{ 2323
Regional Offices: Telephones

{ 2337
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{ 260
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{ 2832
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Published by BIS, New Delhi