IS 1586: Method for Rockwell Hardness Test for Metallic Material (Scales A-B-C-D-E-F-G-H-K 15N, 30N, 45N, 15T, 30T and 45T)

28 Pages·2000·1.9 MB·English

by  Bureau of Indian Standards

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IS 1586 (2000): Method for Rockwell Hardness Test for
Metallic Material (Scales A-B-C-D-E-F-G-H-K 15N, 30N, 45N,
15T, 30T and 45T) [MTD 3: Mechanical Testing of Metals]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
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“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
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“Knowledge is such a treasure which cannot be stolen”

IS 1586:2000
(Superseding IS3754:1988, IS3804:1988,
IS5072:1988, IS5073:1988 and
IS5076: 1988)

)
45q=r, 15a, 3oa * 45tl
( rml jpaw7 )
Indian Standard
METHOD FOR ROCKWELL HARDNESS TEST FOR
METALLIC MATERIAL ( SCALES A-B-C-D-E-F-G-H-K
15N, 30N, 45N, 15T, 30T AND 45T )
( Third Revision)
Ics 77.040.10

0 BIS2000
BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
October 2000 Price Group 9
Mechanical Testing of Metals Sectional Committee, MTD 3
FOREWORD
This Indian Standard ( Third Revision ) was adopted by the Bureau of Indian Standard, after the draft finalized
bythe Mechanical Testing of Metals Sectional Committee had been approved by the Metallurgic! Engineering
Division Council.
This Indian Standard was published in 1960and subsequently revised in 1968and 1988.
Inthisrevision the requirement ofmethod for Rockwell superficial hardness test, calibration ofstandardized blocks
and verification of Rockwell hardness testing machines have been included. In the preparation of this standard,
assistance has been drawn from ASTM E 18-97a ‘Standard test methods for Rockwell hardness and Rockwell
superficial hardness of metallic materials’ issued byAmerican Society for Testing and Materials, USA.
This revised standard supersedes the following Indian Standards:
1sNo. Title
3754:1988 Method for calibration of standardized blocks to be used for Rockwell hardness testing machine
(Scales A-B-C-D-E-F-G-H-K) (first revision)
3804:1988 Method for verification of Rockwell hardness testing machines (Scales A-B-C-D-E-F-G-H-K)
(jirst revision)
5072:1988 Methods for Rockwell superficial hardness test (Scales 15N,30N, 45N, 15T,30T and 45T )(jirs/
revision )
5073:1988 Method forverification ofRockwell superficial hardness testing machines (Scales 15N,30N,45N,
15Tand 45T )(first revision)
5076:1988 Method for calibration ofstandardized blocks tobe used for rockwell superficial hardness testing
machines (Scales 15N,30N,45N, 15T,30T and45T )(jhtrevision )
For the purpose of deciding whether a particular requirement of this standard iscomplied with, the final value,
observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with

IS2:1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained inthe

rounded off value should be the same as that of the specified value inthis standard.
IS 1586:2000
Indian Standard
METHOD FOR ROCKWELL HARDNESS TEST FOR
METALLIC MATERIAL ( SCALES A-B-C-D-E-F-G-H-K
15N, 30N, 45N, 15T, 30T .AND 45T )
( Third Revision)
1 SCOPE 5 APPARATUS
This standard specifies the method for conducting 5.1 Testing Machine
the Rockwell hardness test (scalesandhardness range
Capable of applying apredetermined force or forces
according to Table 1)for metallic materials.
within the ranges shown inTable 1and inaccordance
NOTE — For certain materials, the hardness range may with Annex A.
be narrower than those indicated.
5.2 Sphere-Conical Diamond Indenter
2REFERENCE
Inaccordance with Annex Ahaving anangle of 120°
The following Indian Standard contains provisions
and radius of curvature at the tip of 0.200 mm for
which through reference in this text, constitutes
A, C, Dand all Nscales.
provision of this standard. Atthetime ofpublication,
the edition indicated was valid. All standards are 5.3 Steel Ball Indenter
subject to revision and parties to agreements based
In accordance with Annex A having a diameter of
on this standard are encouraged to investigate the
1.5875 mmforB,F,Gandall‘T’scalesand 3.175mm
possibility of applying the most recent edition of
for E, Hand Kscales.
the standard indicated below :
5.4 Measuring Device
LSNo. Title
See Annex A.
1501(Part 1): Method forVickers hardness testfor
1984 metallic materials: Part 1HVtoHV
6 TEST PIECE
100(second revision)
6.1 The test shall be carried out on a surface which

3 PRINCIPLE
issmoothandeven,freefkomoxidescale,foreignmatter

The test consists of forcing an indenter ( diamona and, in particular, completely free from lubricants
cone or steel ball ) into the surface of atest piece in (except for tests on some reactive materials, such as
two steps under specified conditions ( see 7 ) and titanium, where lubricants such as kerosene may be
measuring the permanent increase of depth of required ). If lubricants have been used, it shall be
indentation. The unit of measurement for e is stated in the test report.
0.002 mm for Rockwell hardness and 0.001 mm for
6.2 Preparation shall be carried out in such a way
Rockwell superficial hardness. From the value ofe, a
that any alteration of surface hardness due to hot or
number known asthe Rockwell hardness isderived.
coldworking isminimized.
4 SYMBOLS AND DESIGNATIONS
6.3 The thickness of the test piece or of the layer
The symbols and designations used inthis standard under test shall be at least ten times the permanent
are given inTables 1and 2and Fig. 1,2, 3and 4. increase of depth e. The minimum thickness of test
piece inrelation to the Rockwell hardness is shown
4.1 The Rockwell hardness isdenoted bythe symbol
inFig. 5,6 and 7.
HR preceded by the hardness value and completed
by a letter indicating the scale. After the test, nodeformation shall be visible on the .
surface of the test piece opposite to the indentation.
Examp[e:
6.4 For tests on convex cylindrical surfaces and
59HRc = Rockwell hardness of59,measured on
spherical surfaces, the corrections given inTables 3,
the C scale
4, 5, 6 and 7 shall be applied. In the absence of
70HR30N = Rockwell superficial hardness of 70 corrections for tests on concave surfaces, tests on
measured on the 30N scale. such surfaces shall be subject to special agreement.
1
1S 1586:2000
Table 1 Hardness Range
(Clauses l,4and 5.1 )
. .. —
Rockwell Hardness Type of Indenter Preliminary Additional “1’otnl Rockwell
Hardness Test Test Test Hardness
Scale Force, F. Force, F, Force, F Range
N(kgf) N(kgf) N(kgf)
(1) (2) (3) (4) (5) (6) (7)
A HRA Diamond cone 98.07(10) 490.3(50) 588.4(60) 20 to 88 HRA
B HRB Steel ball 1.5875 mm 98.07(10) 882.6(90) 980.7(100) 20 to 100 HRB
c HRc Diamond cone 98.07(10) I 373.0(140) I 471.0(150) 20 to 70 HRC
D HRD Diamond cone 98.07(10) 882.6(90) 980.7(100) 40 to 77 HRD
E HRE Steel ball 3.175 mm 98.07(10) 882.6(90) 980.7(100) 70 to 100 HRE
F HRF Steel ball 1.5875 mm 98.07(10) 490.3(50) 588.4(60) 60 to 100 HRF
G HRG Steel ball 1.5875 mm 98.07(10) I 373.0(140) I 471.0(150) 30 to 94 HRG
H HRH Steel ball 3.175mm 98.07(10) 490.3(50) 588.4(60) 80 to 100 HRH
K HRK Steel ball 3.175 mm 98.07(10) 1 373.0(140) 1 471.0(150) 40 to 100 HRK
15N HR15N Diamond cone 29.42(3) 117.7(12) 147.1(15) 70-94 HR15N
30N HR30N Diamond cone 29.42(3) 264.8(27) 294.2(30) 42-86 HR30N
45N HR45N Diamond cone 29.42(3) 411.9(42) 441.3(45) 20-77 HR45N
15T HR15T Steel ball 1.5875 mm 29.42(3) 117.7(12) 147.1(15) 67-93 HRI 5T
30T HR30T Steel ball 1.5875 mm 29.42(3) 264.8(27) 294.2(30) 29-82 HR30T
45T HR45T Steel ball 1.5875 mm 29.42(3) 411.9(42) 441.3(45) 1-72 HR45T
Table 2Symbols and Designations
( Clause 4 )
Symbol/ Description
Designation

(1) (2)

a Angle of diamond cone
R Radius of curvature at the tip of the diamond cone
D Diameter of steel ball
F~ Preliminary test force
F, Additional test force
F Total test force
Do Depth of indentation under preliminary test force before application of additional test force
h, Increase in depth of indentation under additional test force
e Permanent increase ofdepth of indentation under preliminary test force after removal of additional
test force, expressed inunits of0.002 mm for Rockwell hardness and 0.00 Imm for Rockwell super-
ficial hardness
HRA 1
HRc Rockwell hardness = 100- e
HRD
HRE
HRF
HRG Rockwell hardness = 130 -– e
HI?H
HRK ,

HRN
Rockwell superficial hardness = 100 – e
HR T
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IS 1586:2000
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