IS 25.1979 (Anti-friction Bearing Alloys)

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IS 25 (1979): antifriction bearing alloys [MTD 9: Lead,
Zinc, Cadmium, Tin, Antimony and their Alloys]
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Indian Standard
SPECIFICATION FOR
ANTIFRICTION BEARING ALLOYS
( Third Reuision )
Is : 25 - 1979
( Reaffirmed 2003 )
Fil’th Reprint APRIL 1996
UDC 669.018.24
tg Copyright 1980
BUREAU OF INDIAN STANDARD S
MANAK BRAVAN, 9 BAMDUR SHAH ZAFAR MARG
NEW DELHI 110002
Gr2 Aprir 1980

Indian Standard
SPECIFICATION FOR
ANTIFRICTION BEARING ALLOYS
( Third Retiision )
IS : 25 - 1979
Lead, Zinc, Tin, Antimony and Their Alloys
Sectional Committee, SMDC 12
Chairman
SHRI F. A. A. JASDANWALLA
Representing
Indian Standard Metal Co Ltd, Bombay
Members
SHRI A. M. BEDAGERI
Indian Smelting and Retining Co Ltd, Bombay
SHRI A. K. BHATTACHARYA National Test House, Calcutta
SHRI C. CHAT~ERIEE
Indian Standard Metal Co Ltd, Bombay
SHRI N. R. MANIAR ( Alternate )
CHEMIST & METALLURGIST, CEN- Ministry of’ Railways
TRAL RAILWAY, BOMBAY
CHEMIST AND METALLURGIST,
RDSO, LUCKNOW ( Alternate 1
SHRI P. GHOSH
Indian Cable Co Ltd. Calcutta
SHRI TRILOK SJNGH ( AIternate 1
SHRI A. K. GUHA Directorate General of Supplies & Disposals,
New Delhi
SHRI K. M. TANEJA ( AIternafe )
SHRI D. P. JAIN
Saru Smelting Pvt Ltd, Meerut
SHRJ D. N. CHAKRABORTY ( Alternate )
SHRI K~SHORJ LAL National Metallurgical
Jamshedpur
Laboratory ( CSIR ),
SHRI C. S. SJVARAMAKRJSHAN
( Alternate )
SHR~ LAXAMAN MJSHRA Directorste General of Technical Development,
New Delhi
SHRI M. K. BANERJ~E ( Alternate )
SHRI G. D. MODJ Ail India Type Founders’ Association, Bombay
SHRI PRITOSH DHAR ( Afternate I )
SHRI A. M. TH~RUNAVAKARAM
( Akrnate 11 )
SHRI K. R. NARASIMHA Metal Box Company of India Ltd. Calcutta
@ CopyfiRht 1980
(Continued on page 2 )
BUREAU OF INDIAN STANDARDS
This publication is protected under the Indian Copyright Act ( XIV of 1957 ) and
reproduction in whole or in part by any means except with wruten permission ol
the publisher shall be deemed to be an infringement of copyright under the sail Act.

IS : 25 - 1979
(Continued from page 1)
Members
Representing
SHRI A. T. PAL Ministry of Defence ( R & D )
SHRI I. N. BHATIA ( Alternate )
SHRI RAMAN LAL NAOINDAS PARIKH Star Metal Refinery Private Ltd, Bombay
SHRI HARISH CHANDRA SHARMA
( Alternate )
SHRI B. R. RAI Cominco Binani Zinc Ltd, Calcutta
SHRI N. SRINNASAN ( Alternate )
SHRI M. K. RAO Binani Metal Works Ltd. Calcutta
SHRI B. N. RAY Ministry of Drfence (DGI )
SHRI P. M. SENGUPTA ( Alternate )
SHRI T. R. SHANMUOAM Bharat Electronics Ltd. Bangalore
SHR~ N. SRBENIVASAN Union Carbide India Ltd, Calcutta
SHRI R. K. MEHROTRA ( Alternate )
SHRI V. R. SUBRAUANIAN Indian Lead/Zinc Information Centre, New Delhi
SHRI A. C. WADHAVAN Hindustan Zinc Ltd, Udaipur
DR B. R. L. Row ( Alternate )
SHRI C. R. RAMA RAO, Director General, ISI ( Ex-officio Member )
Director ( Strut & Met )
Secretary
SHRI S. L. BALI
Deputy Director ( Metals ), IS1
2

IS : 25 - 1979
Indian Standard
SPECIFICATION FOR
ANTIFRICTION BEARING ALLOkS
( Third Reoision )
0. FOREWORD
0.1 This Indian Standard ( Third Revision ) was adopted by the Indian
Standards Institution on 22 June 1979, after the draft finalized by the Lead,
Zinc, Tin, Antimony and Their Alloys Sectional Committee had been
approved by the Structural and Metals Division Council.
0.2 This standard was originally published in 1950 and, subsequently
revised in 1961 and 1966. In this revision of the standard, clause on shapes
and weights of ingots has been revised. Sampling clause has been modified
and impurity limits for Grade 6 have been revised, Pouring temperature
ranges and typical uses of the alloys are given in Appendix A for
information.
0.3 For the purpose of deciding whether a particular requirement of this
standard is complied with, the final value, observed or calculated, expressing
the result of a test or analysis, shall be rounded off in accordance with
IS : 2-1960*. The number of significant places retained in the rounded off
value should be the same as that of the specified value in this standard.
1. SCOPE
1.1 This standard covers the requirements for ten grades of antifriction
bearing alloys ( see Table 1 ).
2. SUPPLY OF MATERIAL
2.1 General requirements relating to the supply of antifriction bearing
alloys shall conform to IS: 1387-1967t.
3. CHEMICAL COMPOSITION
3.1 The material when analyzed in accordance with IS : 1409-1959: shall
have the chemical composition as given in Table 1.
*Rules for rounding off numerical values ( revised ).
tGeneta1 requirements for the supply of metallurgical materials ( first revision ).
SMethods of chemical analysis of antifriction bearing alloys.
3

TABLE 1 CHEMICAL COMPOSITION OF ANTIFRICTION BEARING ALLOYS
( CImuu 1.1 wld 3.1 )
GRADE ALLOYING Em- PER~XWT hwvnmes, PERCENT, Max TOTAL OF 5
A
t * , INDICATED J
.%I Sb Pb cu Ni Cd As Zn Fe As Al Bi Zn Cd IMPURITIES,
PERCENT,
Max
(1)
90
(2) (3) (4) (5) (6)
9OJuin 65-75 @3Mux 2-5-3-5 -
(7) (8) (9)
- - -
(10) (11) (12) (13) (14) (15)
0.08 0.10 0.005 0’05 0’008 0.05
(16)
0.15
tl
k
I
84
84hfin PO-11.0 W3Max 5~0-~0 -
0.08 0.10 ‘OW5 0.05 0’008 0.10
0.17
75
749769 10’0-12-0 Remainder 275-3-25 -
0.08 0.10 OW5 0’05 Of)08 0.10
0.17
P
69
68s7OQ 0.2 Max O-3 MUJS 1~0-1*4 -
- - 29.0.
31.0
0.10 0.15 o-005 0.08 - 0.10
0.22
60
590-61.0 11912-O Remainder 25-3.5 -
0.10 0.15 0905 0.08 0.01
0’10
0.22
20
19+21*0 14lXl&O Remainder 1.25-1.75 -
- - -
0.10 0.20 0’005 0.10 0.01
0.10
0.26
10 9’0-11’0 13Xk15.0 Remainder @50-1-O -
O-10 Or20 0.005 0.10 0.01
@lo
0.28
6 5.0-7’0 14’0-1~0 Remainder 0%&1*20 O-80- 0.70. 0s -
1.50 I.50 0.80
0’10 - 0.05 0.10 005
0.15
5
45-5.5 14%160 Remainder @30-@70 -
0.10 0.25 WOO5 0.10 0.01 0.10
0.28
1
O-75-125 15.@1&0 Remainder @5 Max - - 0.8-1.1 -
@IO - 0*005 @lo 001 0.10
0.28

4. FREEDOM FROM DEFECTS
IS:25-1979
4.1 The ingots shall be homogeneous and free from non-metallic inclusions,
and have a clean appearance, and fine grain structure.
5. SHAPE AND WEIGHT OF INGOTS
5.1 The shape and weight of ingots shall be agreed to between the
purchaser and the manufacturer.
6. FRACTURE TEST
6.1 Unless otherwise agreed to between the purchaser and the manufacturer,
two percent of the ingots from each melt shall be broken at the
notch to find out the nature of fracture. The fractured surfaces shall not
show segregation, dross, dirt, spots, overheated metal or any type of
non-metallic inclusions.
7. SAMPLING
7.1 Sampling for Chemical Analysis - Unless otherwise agreed to between
the purchaser and the manufacturer, two ingots or two percent of the
ingots, whichever is greater shall be, selected at random from each melt.
7.1.1 The method of preparing samples for chemical analysis from the
ingots selected under 7.1 shall be in accordance with IS : 1409-1959”‘.
7.2 Sampling for Fracture Test - Unless otherwise agreed to between the
purchaser and the manufacturer, sampling shall be done as given in 6.1.
8. RE-TESTS
8.1 Re-test for Chemical Cqmposition - If the sample prepared under 7.1.1
fails to meet the requirements under 3.1, two more tests shall be
conducted on the same sample in order to confirm that the analysis has
been done correctly. If both the test results satisfy the relevant requirements,
the lot shall be accepted. Should either of the re-tests fail, the lot
represented shall be deemed as not complying with this standard.
8.2 Re-test for Fracture Test - If the samples selected and tested to meet
the requirements under 6.1 fail, two further samples shall be selected from
the same melt and shall be broken at the notch to find out the nature of
the fracture. Should the fractured surfaces of any one of the ingots show
segregation, dross, dirt, spots, overheated metal or any type of non-metallic
inclusions, the lot shall be deemed as not complying with this standard.
*Methods of chemical analysis of antifriction bearing alloys.
5

Is:25-1979
9 MARKING
9.1 Each ingot shall be legibly marked with:
a) Cast number;
b) Grade of the material; and
c) Manufacturer’s name, initials or trade-mark.
9.2 BIS Certifkation hh-kiag
The product may also be msrked with Standard Mark.
9.2.X The use of the Standard Mark is governed by the provisions of the
Bureau of Indian Standards Act, 1986 and the Rules and Regulations made
thereunder. The details of conditions under which the Iicence for the use of
Standard Mark may be granted to manufacturers or producers may be obtained
from the Bureau of Indian Standards.
APPENDIX
( Clause 0.2 )
A
POURING TEMPERATURE RANGES AND TYPICAL USES OF
ANTIFRICTION BEARING ALLOYS
The information given below is only to indicate to the purchaser the
pouring temperature ranges and the typical uses of various alloys specified
111 this standard:
Grade
Pourfng
Temperature
in “C
90 340 to 390
84 430 to 460
75 360 to 400
Typical Uses
For lining of petrol and diesel engine
bearing cross-heads in steam engine and
other bearings used at high speeds. (As
the tin content drops in these alloys,
their resistance to shock and heavy load
increases )
Mostly used for repair jobs in mills and
marine installations. ( Because of its
long plastic range, it can be spread in as
a wipe joint )
6

Grade
69
60
6
Pouring
Temperature
in “C
500 approx
370 to 400
370 to 410
500 to 530
350 to 390
Typical Uses
IS:25-1979
For underwater applications as a bearing
alloy and gland packings
For lining of bearings required for medium
speeds, such as centrifugal pumps, circular
saws, convertors, dynamos and
electrical motors
For low speed bearings, such as pulp
crushers, concrete mixers and rope
conveyors
Heavy duty bearings, rolling mill bearing
in sugar, rubber, paper, steel industries,
etc. Bearings for diesel engines, crossheads
in steam engines, turbines, etc.
Generally replaces the high tin bearings
for heavy duty jobs
For mill shaftings, railway carriage and
wagon bearings
Used as a thin line overlay on steel strips
where the white metal lining material is
0.076 mm thick
7

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