इंटरनेट
मानक
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to
information for citizens to secure access to information under the control of public authorities,
in order to promote transparency and accountability in the working of every public authority,
and whereas the attached publication of the Bureau of Indian Standards is of particular interest
to the public, particularly disadvantaged communities and those engaged in the pursuit of
education and knowledge, the attached public safety standard is made available to promote the
timely dissemination of this information in an accurate manner to the public.
“जान1 का अ+धकार, जी1 का अ+धकार”
“प0रा1 को छोड न' 5 तरफ”
“The Right to Information, The Right to Live”
“Step Out From the Old to the New”
Mazdoor Kisan Shakti Sangathan
Jawaharlal Nehru
IS 5788 (1986): Iron castings with spheroidal or nodular
graphite for pressure containing parts for use at elevated
temperatures [MTD 6: Pig iron and Cast Iron]
“!ान $ एक न' भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह”
है”
ह
Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
IS : 5788 - 1986
Indian Standard
( Reaffirmed 2005 )
SPECIFICATION FOR IRON CASTINGS WITH
SPHEROIDAL OR NODULAR GRAPHITE FOR
PRESSURE CONTAINlNG PARTS FOR USE
AT ELEVATED TEMPERATURES
(First Rev-ision
j
First Reprint NOVEMBER 1991
UDC
669.131.7-14
@ Copyright 1987
BUREAU
MANAK
OF
BHAVAN.
INDIAN
9
BAHADUR
STANDAR-DS
SHAH
ZAFAR
MARG
NEW DELHI 110002
Gr-4
February
1987
IS :5788- 1986
Indian Standard
~P~FICATION
FOR IRON CASTINGS WITH
SPHEROIDAL OR NODULAR GRAPHITE FOR
PRESSURE CONTAINlNG PARTS FOR USE
AT ELEVATED TEMPERATURES
( First Revision)
Pig Iron and Cast h-on Sectional Committee, SMDC 9
Chairman
Rsfiesrnling
Ductron Castings Ltd, Hyderabad
SHRI B. G. SASTIZY
Members
SHRI M. S. DALVI ( Alternate to
Shri B. G. Sastry )
SHRI P. K. AROUA
Mechanical
Engineering
Research Development
Organization ( CMERI ), Ludhiana
. Indian Iron &z Steel Co Ltd, Burnpur
Snn~ R. K. BANERJEW
SHRI R. DAYAL ( Alternafe )
Ministry of Defence ( DGOF j
SHRI T. K. BANERJEE
SHRI A. K. SARKA~~ ( Alfern& )
Bhagwati Spherocast Ltd, Hyderabad
DR P. N. BHA~WATI
SHRI M. R. SHAH ( Alternate )
Visvesvaraya Iron & Steel Ltd, Bhadravat
SHRI K. B. D. 5EERlAH
SERX B. S. UMAPATEY ( Alternale )
National Test House, Calcutta
SH~I A. M. BISWAS
SERI K. L. BARVI ( Alternafe )
Indian Institute of Technology, Kharagpur
PROBA. K. CHAK~ABOILTY
Indian Register of Shipping, Bombay
SHRI S. CBANDRA
SHRI H. K. TANEJA ( Allernalc )
CHIWIST & M x T A L L u R 0 I s T Ministry ofRailways
EASTERN RAILWAY, J AMALPUR
Hindustan Machine Tools Ltd, Bangalore
SHRI P. P. CHOPRA
SHRI H. S. RAWACEIANDRA ( Alternate 11
SERI P. RAYPRASAD
( Alternate IL )
SHRI V. N. VENKATESAN ( Allernate III )
SHRI A. SHANTARAIU ( Alternate IV )
( Continued on page 2 )
0
Copyright 1957
BUREAU
OF INDIAN
STANDARDS
This publication
is protected under the Indian Copyrighf Act ( XIV of 1957) and
reproduction m whole or in part by any means except with written permission of the
publisher shall be deemed to be an infringement of copyright under the said Act.
IS t 5188 - 1986
( Continued from pugs 1 )
Reprwnting
Members
Mercury Iron & Steel Co, Bombay
Iron & Steel Control, Calcutta
Sash S. H. CO~XISSARIAT
SHRI B. K. DUTTA
Sxar S. S. SAH~ ( Alfernafs
SHRI S. Y. GRORPADE
SH~I P. C. JAIN
SJXRIK. h. KINKAR
)
Sandur Manganese & Iron Ores Ltd, Mysore
Joint Plant Committee, Calcutta
Institute of Indian Foundrymen, Calcutta
SHRI H. H. SINGE ( Allarnofe )
SHRI V. B. KHANNA
Directorate
General
of Supplies
& Disposals
( Inspection Wing ), New Delhi
SHRI T. N. UBOVEJA ( Alfarnate \1
Electrosteel Castings Ltd, Calcutta
SIIRI B. v. LU
SHRI S. B. SEX?QUPTA( Altcrnats)
Heavy Engineering
Corporation
Ltd ( Foundry
SERI M. MOHAN
Forge Plant ), Ranchi
SERI I. ALI ( Alternate )
New Standard Engineering Co Ltd, Bombay
’
SHRI P. _K. MUKHERSEE
SHRI DEEPAK SEARMA ( Alternate )
Tata
Engineering
& Locomotive
Co
Ltd,
Dn P. S. PATTIHAL
Jamshedpur
Sam U. M. NADQAR ( Alternafe )
SteeE$ority
of India Ltd (Bhilai Steel Plant),
Da G. RAI
SteeLtiu$ority
SHRI S. V. RAJWADE
SRRI R. R. SARIN ( Alternate )
SIIHK C. P. RAMAMURTI~Y
SIII~I D. VA:U~XVA RAO
Slllll
P. P. KAWOOI
Srler S. Ctlouue~
RIXPRE~~:NTATIVE
REPXESENTATIVI
SHRI A. K. SAHA
SHRI B. P. SINoH
( Ahernate)
of India Ltd (Bbilai
Steel Plant),
Shah Malleable Castings Ltd, Bombay
Ennore Foundries Ltd, Madras
Steel Authority
of India Ltd ( Rourkela
Plant ), Rourkela
Steel
Development Commissioner
( Small Scale Industries ), New Delhi
Maruti Udyog Ltd, Gurgaon
Bokaro Steel Plant, Bokaro
( Alternate )
Directorate
General of Technical Development,
Nl w Delhi
Kesoram Spun Pipes & Foundries, Calcutta
Sang P. J. SHENuY
SIII~I S. C. NAI(SARIA ( Atternnte )
Tata Iron & Sleel Co Ltd, Jamshedpur
SIHU I. S. P. SJJWTY
SlIIlI u. SEN
SIII:I T. SUL)IIXAI~ ( illlerrrde )
Fertilizer Corporation of India Ltd, Sindri
SHnl R. K. SINIJA
Walchand Nagar Industry Ltd, Satara
SIIUI P. S. N. SUNDRAM
Southern Alloy Foundries Pvt Ltd, Madras
SH~I S. THIAQHAI:AJAN
SIIIII A. TIJAXQAV~LU ( Alternote )
National
lMetallurgica1
Laboratory
( CSIR ),
Dn S. K. TIWARY
Jamshedpur
Federation
of Engineering
Industries of India,
SHRI V.~N. UPADI~AYAYA
New Delhi
SHRI H. L. BHARDWAJ ( Alternatr )
1 Continued on puge 14 )
2
IS: 5788.1986
Indian Standard
SPECIFICATION -FOR IRON CASTINGS WITH
SPHE-ROIDAL -OR NODULAR GRAPHITE FOR
PtiESSURE CONTAINING PARTS FOR USE
AT ELEVATED TEMPERATURES
( First Revision)
0.
FOREWORD
0.1 This Indian Standard ( First Revision ) was adopted by the Indian
Standards Institution on 16 June 1986, after the draft finalized by the Pig
Iron and Cast Iron Sectional Committee had been approved by the
Structural and Metals Division Council.
0.2 This standard was first published in 1970. While reviewing this standard in the light of the experience gained during these years, the Committee
has decided to revise this standard aligning it with other existing standards on the subject.
0.3 This standard keeps in view the manufacturing and trade practice
being followed in the country in this field. Assistance has also been
derived from ASTM A-395-1980 - Ferritic ductile iron pressure retaining
castings for use at elevated temperatures, issued by the American Society
of Testing and Materials.
0.4 This standard contains clauses which require the purchaser agreement and/o: to specify these requirements, if necessary, while placing the
order.
9.5 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.
*Rules for roundingoff numerical values ( rsviscd) .
3
IS :5788-
1986
1. SCOPE
1.1 This standard covers the requirements for iron castings with spheroidal or nodular graphite for pressure containing parts for use at elevated
temperatures.
2. SUPPLY
OF MATERIAL
2.1 General requirements relating to the supply of the material
as laid down in IS : 1387-1967*.
shall be
3. MANUFACTURE
3.1 The method of manufacture shall be left to the discretion of the manufacturer provided that the castings conform to this standard.
4. CHEMICAL
COMPOSITION
4.1 The castings, when tested in accordance
have the following chemical composition:
with IS : 228-1972t,
Constituent
Percent
Total carbon, Min
Silicon, Max
Phosphorus, Max
3-O
2.50
0.08
+hall
NOTE1 - For each reduction of 0’01 percent below the maximum specified
phosphorus content, an,increase of 0?08 percent silicon above the specified maximum
will be permitted,up to a maximum of 2’75 percent.
NOTE2 - Silicon content above 2’75 percent, or phosphorus above 0.08 percent
have a tendency to lower the impact resistance of the material.
If the carbon content is below 3.00 percent, excessive cementite may form during cooling and if this
is not removed during the annealing cycle, the impact resistance of the material
may be lowered.
5. WORKMANSHIP
AND FINISH
5.1 The castings shall be accurately moulded in accordance with the
pattern of working drawings supplied by the purchaser with the addition
of such letters, figures or marks as may be specified.
5.2 The drawings shall specify the tolerance on all important dimensions.
On other dimensions, the toltrance
specified in IS : 8350-1977$ shall
apply.
*General requirements for the supply of metallurgical materials (jirst rcuision ).
tMethods of chemical analysis of steels ( second reuision ).
+,Deviations for untoleranced
dimensions of spheroidal
castings.
4
or nodular
graphite
iron
+
6. HEAT
TREATMENT
6.1 All castings shall be~given a ferritizing heat treatment to ensure uniform mechanical properties throughout each section and to produce substantially a ferritic structure that contains no massive carbides.
6.2 When specified in the purchase order, castings with mechanical properties obtained ‘as cast’ may have a stress relief heat treatment at a
minimum temperature of 550°C.
7. FREEDOM
FROM
DEFECTS
7.1 The castings shall be free from surface defects, such as adhering sand
and shall be reason‘ably smooth. The runners, risers, fin.9and other extraneous metals shall be removed from the castings. They shall be well dressed
and fettled.
7.2 The castings shall not~berepaired by welding or brazing but may be
plugged in case they leak on hydrostatic test, provided that the diameter
of the plug does not exceed 50 mm. The details of the plugging of the
casting may be agreed to between the purchaser and the manufacturer.
Also any inherent defect revealed during subsequent machining, notwithstanding any previous certificate of satisfactory testing might make the
-castings liable to rejection.
8. TEST
SAMPLES
8.1 Test samples shall be cast separately in sand moulds. They shall be
poured from the same ladle of metal as that used to produce the castings
they iepresent and immediately after the castings are poured. Some additional recommendations
regarding casting the test samples are given in
Appendix A.
8.1.1 The test pieces used for the test specified in 10.1 and 10.2 shall be
machined from one of the following type of test samples:
a) U-ty#e test samples - The test piece shall be machined from the keei
( that is, the cross-hatched section of Fig. 1 ),
b) 22yfie test samples - The test piece shall be machined from the keel
( that is, the cross-hatched section of Fig. 2 ), and
c)
Knock-oJ type test samples -See
Fig. 3.
8.1.2 In principle, test sample Type IIa or IIb of 25 mm effective
thickness, shall be used; however, if its mass differs widely from, the casting
it represents, another test sample type may be used, by agreement between
the manufacturer and the purchaser.
j
5
IS : 5788
Types
l
1986
I, Ila, Ill and IV
Type Ilb
L---I
RS
t
I-
.
F
R5
DXVENSIONSIN MJLLWETR,ES BOB TYPIC
DIMENSIONS
--
I
IIa
Ilb
i11
W
12
25
25
50
75
40
55
90
90
125
30
40
40
60
65
80
100
100
150
165
--
-
-
A function of the test piece length
FIO. 1
‘U’ TYPE TEST SAMPLES
8.1.3
In exceptional cases, and by prior agreement betw.een the partiesj
the test samples may be attached to the castings; in such cases, their location should be agreed to between the manufacturer and the purchaser.
8.1.4 The test samples shall be cast in sand moulds and stripped at a
temperature not exceeding 5OOW.
8.1.5 All test samples shall be heat-treated simultaneously
adjacent to the relevant casting or castings in the same furnace.
with and
9. SAMPLING
9.1 Sampling for Chemical Analysis - Two spoon samples shall be
taken during the pouring .of each cast or ladle when about one-third and
two-thirds of the metal has been discharged.
The spoon sainples so
obtained shall be cast separately in dry sand in the form ,of 30 mm
diameter bars about 75 mm long. Alternatively, the mould may be filled
directly from the metal stream; The test bars shall be suitably marked so
that the castings they represent could be identified.
6
-
DIMENSIONS IN MILLWETRES BOG TYPE
II
I
111
IV
U
12
25
50
75
I
40
55
100
125
x
25
40
50
65
150
175
135
Y
I
I
%
NOTE - The
casting shall be
140
I
1
I
A function
thickness
of the
40 mm minimum
181) mm minimum
FIG.
2
sand
of the test piece
mould
surrounding
length
I
I
the test sample
during
for types I and II;
for types III and IV.
‘Y’ TYPE TEST SAMPLES
9.1.1 After cleaning the surface, two flats shall be ground near the
bottom of each test bar and the test bar drilled with a 25 mm drill from
one clean surface to the other. The speed of the drill should not be more
than 9 to 10 rev/min. Drillings after being thoroughly mixed shall constitute the sample for chemical analysis.
9.1.2 For the determination
of total carbon the molten metal shall be
-poured into a special split mould ( see Fig. 4 ). This gives pins of iron
3 mm in diameter which have solidified white and which can be broken off
and used direct for total carbon determination.
Carbon determination
from drillings taken from grey samples shall not be done.
9.2 Sampling
for Mechanical
Tests
9.2.1 If one ladle of metal treated to produce spheroidal or nodular
graphite iron is used to make one or more castings, one tensile test shall
be made on a’test sample poured from that ladle.
7
L
Z=ACCORDING
OF TEST
TO LENGTH
PIECE
AN AS-CAST
TEST SAMPLE
MOULD
All dimensions
FIG. 3
in millimetres.
cK~~~~-O~~’ TYPE TEST SAMPLES
IS : 578%- 1986
FRONT
AND
SIDE
ELEVATION
All dimensions in millimetres.
FIG.
4
PIN MOULD FOR CARBON SAMPLES
9.2.2 If successively treated ladles filled from one furnace are used to
produce castings, one tensile test shall be made from each O-5 tonne of
castings or part thereof. If more than one treated ladles are involved in the
production of this quantity of castings, the manufacturer shall take steps to
ascertain that the treatment of other ladles is done by such method as may
be agreed to between the purchaser and the manufacturer.
He may
examine the procedure adopted and satisfy himself that this is adequate.
9
IS : ‘5788 - 1986
9.2.3 In the case of large tonnage of castings being produced continuously the minimum II~UIII~~~of test bars to be provided shall be one
tensile test representing ‘every two hours production froni a melting
furnace.
9.2.4 For castings weighing more than one tonne, one tensile test shall
be conducted on a test sample for each casting, the test sample being cast
as an integral part of the casting.
9.2.5 If more than one furnace is used to fill the ladles, then one tensile
test shall be made on a test sample poured from a treated ladle of each of
the furnaces.
9.2.6 Ml test samples and castings
fication.
10. MECHANICAL
shall be marked
strictly for identi-
TEST
10.1 Tensile Test - The tensile test shall be carried out in accordance
with IS : 1608-1972*, unlrss otherwise agreed to between the purchaser
and the manufacturer.
The test piece shall have a gauge diameter of
14 mm and a gauge length of 70 mm ( see Fig. 5 ). To determine compliance
with proof stress requirements, thk material tested shall be considered to
have passed the test if it dots not undergo an elongation exceeding the
specified percentage on being subjected to the specified minimum stress for
a period of 15 seconds.
R20
d=@\L+0.09
R20
/
NOTE - The method of gripping the ends-of the test pieces,.together
length 11, may be agreed between the manufacturer
and the purchaser.
with their
Lo is theoriginal
gauge length; here & = 5d;
d is the original diameter of the test piece;
LC is the parallel length; LC >~~I% by agreement
between the manufacturer and the purchaser
( in principle LC - LO > d ); and
Lr is the total length of the test piece, which depends on LO and It.
All dimensions
FIQ. 5
in millimetres.
TENSILE TEST PIECE
*Method -for tensile testing of steel products (Jirst revision ).
10
.
IS : 5788 - 1996
19.1.1 In case of samples of type I, the test piece having a reduced
diameter shall comply with the following formula:
L, -
5+35$?.
s
5d
where
L ,, = original gauge length,
S, -
original
cross-sectional
area, and
d - original diameter of the test piece.
10.1.2
The mechanical
properties shall be as specified in Table
TABLE 1, MECHANICAL
1.
PROPERTIES
REQUIREXENT
CEARACTEI~ISTIC
Tensile strength, MPa, Min
Proof Stress ( 0’2 percent ), Min
Elongation
percent, Min
410
270
16
10.1.3 In the case of tests carried out on test bars ‘cut from the finished
castings, the mechanical properties shall be as agreed to between the purchaser and the manufacturer.
when
10.2 Hardness Test - The Brine11 hardness of the meterial,
tested in accordance
with IS : 1500-1983*,
shall be between 142 and
187 HB.
10.2.1 The hardness test shall be carried out on either
on a test coupon representing the material of’ the casting.
11. VALIDITY
the casting or
OF TESTS
11.1 A test may be disregarded if proof results are obtained which are not
due to the quality of the cast iron itself, but to any of the following
reasons:
a) Faulty mounting of the test piece or
test machine;
defective
operation
of the
b) Defective casting or machining of the test piece;
c) Fracture of the tensile test piece beyond the gauge marks; and
d) Casting defects in the test piece, evident after fracture.
11.1.1 In the above cases, a new test piece may be taken from the same
test sample and the results substituted for those of the defective test piece.
*Method
for Brine11 hardness test for metallic
11
meterials, ( second reuision ).
16 : 5298 - 1986
12. RE-TEST
12.1 Should any of‘the tests fail to meet the specified property requirements, two re-tests per failed test shall be carried out.
12.1.1 The batch is regarded as conforming to the specified requirements when the results of the two re-tests conform to the values specified
in the standard. However, the batch may be rejected if one of the re-tests
fails.
12.2 Should the samples of castings supplied in the heat-treated condition
fail%0 pass the test, the manufacturer shall have the,right to reheat-treat
the castings together with the representative test bars and resubmit &em
for inspection and testing.
13. ADDITIONAL
~TESTS
13.1 If the purchaser desires any special tests or requirements, such as
hydrostatic test or microstructure, not specified in this standard, he shall
state these when placing the enquiry and order for the material. The
details of these tests shall be as agreed to between the purchaser and the
manufacturer.
14. MARKING
14.1 Unless the purchaser desires otherwise, each casting, wherever practicable, shall be legibly marked with a number or identification mark by
which it can be traced to-the melt from which it was made.
14.1.1 Wherever practicable, the castings may also bear the ISI
fication Mark.
Certi-
NOTE - The use of the IS1 Certification Mark is governed by the provisions of
the Indian Standards Institution ( Certification
Marks ) Act and the Rules and
Regulations made thereunder.
The IS1 Mark on products covered by an Indian
Standard conveys the assurance that they have been produced to comply with the
requirements of that standard under a well-defined system of inspection, testing and
quality control which is devised and supervised by IS1 and operated by the producer.
IS1 marked products are also continuously checked by IS1 for conformity to that
Details of conditions under whicha licence for the
standard as a further safeguard.
use. of the IS1 Certification Mark may be granted to manufacturers
or processors,
may be obtained from the Indian Standards Institution.
12
1s : 5’188 - 1986
APPENDIX
A
( Clause 8.1 )
RECOMMENDATIONS
FOR CASTING
OF TEST SAMPLES
A-l. The test sample may be cast in sand to any convenient size and
shape, .provided the sample is sound and free from any casting -defect.
A-l.1 Suitable samples for providing a proportional sound tensile test
piece are represented in Fig. 1, 2 and 3. These keel or U-blocks have
been found satisfactory in service.
A-I.2 A convenient form of test sample cut from one of the castings, as
agreed to between the purchaser and the manufacturer, may be used for
the purpose of testing strength of the casting.
A-I.3 In case of sand moulds for test samples of Type III and IV ( see
Fig. 1 and 2 ), a rigid COB sand mould is recommended.
13
fS:5788-1986
MCfl,bCtS
Re~wcscnting
DR G. VENICATARAMAN
Bharat Heavy Electricals Ltd
Snur A. K. MIWAI> ( Alternafe)
SARI K. RAoaAv1sN1maN,
Director General, IS1 ( Ex-oficio Mmbsr )
Director ( Strut & Met )
Secrelary
SJiRI S. S. SRTHI
Joint Director
Spheroidal
Graphite
( Metals ), IS1
Iron Castings
Subcommittee,
SMDC
9 : 2
Comerrcr
DR P. N. I~J~AOWATI
Uhagwati
Spherocast
Ltd, Ahmadabad
Members
SHILI M. 11. SllhJr ( flbmnle
Dr 1’. N. Bhagwati )
SHRI S. K. AIIU.I,\
Snsr 1). 13. Vyas ( Allcrrrale )
DEPUTY DIRECTOR ( MET )-I
to
Indian Smelting
& REfining Co Ltd, Thane
Research,
Designs
Lucknow
Sr Standards
Organisation,
A~SISTAN~I, RI.:SI~A~L~X0a~:lcx.I~
( MW-III
) ( illfemale )
Mysorc Kirloskar Ltd, Harihar
SIII:I D. K. DI\I’~
‘il!I~I u. S. (:OVlNI, ( /,llrrtftife )
EIindustan Machiue Tools Ltd, Bangalore
SHl<I 1~. A. GANJ)III
Hindustan Motors Ltd, Trivellore
SllltI v. S. UiX.\NA’l 11
S~tax Ii. SI~INIV.~SAN ( nllertrale )
Escorts Ltd, Faridabad
SERI Sarv I). K~[ANNA
SHRI NAXINIMR SINC~I ( Allernale )
Business Combine Ltd, Nasik
SHRI s. B. PATlIAR
Snnr P. R. Txxavult ( dllernale )
Tata
Engineering
&
Locomotive
Co
DR P. S. PATTIIIAL
Jamshedpur
DR P. 6. DASUTI<AI~ ( dllemnfe )
AShok Leyland Ltd, Madras
REPRESENTA’JIVE
.
SHRI
R. C.
PItASAD
HMlW,
Ranchi
SHRI D.K.
DAM ( A&male )
Premier Automobiles Ltd, Bombay
SHRI K. S. SHAII
SEW M. S. SAIIANI ( Aller&e )
Ductron Castings Ltd, Hydcrabad
SHRI B. G. SAsTRY
SIIHI M. S. DALVI ( rlhunfe
)
Tractors & Farm Equipment Ltd, Madras
SERI N. S. SWAMLNA’PHAN
SHRI S. NATESAN ( Allerfrale )
Fouthcrn Alloy Foundries Pvt Ltd, Madras
SHRI S. THIAWXARAJAN
SHRI A. TEENGAVELU ( Allertrale )
14
Ltd,
BUREAU
INDIAN
OF
STANDARDS
Headquarters:
Manak
Bhavan,
Telephones:
Regional
Central
9 Bahadur
331
01 31,
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( Common
Manaksanstha
to all Offices)
Telephone
Offices:
: Manak
Bhavan, 9 Bahadur Shah Zafar Marg,
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: 1 /14 C. I. T. Scheme VII M, V. I. P. Road.
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I
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Reprography Unit, BE,
New Delhi, India
AHENDMENT
NO.
1
NOVEMBER 1987
TO
IS:5788-1986 SPECIFICATION FOR IRON CASTINGS WITH
SPHEROIDILL.
OR NODULAR GRAPHITE -FOR PRESSURE
CONTAINING PARTS FOR USE AT
ELEVATED TEMPERATURES
(First Revision)
4.1) - Substitute
(Page 4, clause
following for the existing clause:
the
'4.1 The chemical composition of the castings when
determined in accordance with the methods specified
in IS:228-1959* and/or any of its relevant part or
by any other established instrumental/chemical
method, shall be as given below:
Constituent
Percent
Total carbon, Min
Silicon, Max PhosphorurMax
3.0
2.50
0.08
In case of dispute the procedure specified in
X:228-1959* or in its relevant part shall be the
referee method.
No~te 1 - For each reduction of 0.01 percent
the
maximum
below
specified
phosphorus
content, an increase of 0.08 percent silicon
above the specified maximum will be permitted ’
up to a maximum of 2.75 percent.
*
.’
Note 2 - Silicon content above 2.75 percent,
or phosphorus above 0.08 percent have a tendency
to lower the impact resistance of the material. If
the carbon content is below 3.0 percent, excessive
cementfte may form during cooling and if this is
not removed during the annealing cycle, the impact
resistance of the material may be lowered.'
*Method of chemical analysis of pig iron, cast
iron
plain
carbon
and
low
alloy
and
steels(revised).
(SMDC 9)
Reprography Unit, BIS, New Delhi, India