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. इंटरनेट मानक “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” “प0रा1 को छोड न’ 5 तरफ” Jawaharlal Nehru “Step Out From the Old to the New” “जान1 का अ+धकार, जी1 का अ+धकार” Mazdoor Kisan Shakti Sangathan “The Right to Information, The Right to Live” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 7899 (2006): Alloy steel castings suitable for pressure services [MTD 14: Foundry]
Transcript
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.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 7899 (2006): Alloy steel castings suitable for pressureservices [MTD 14: Foundry]
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IS 7899:2006
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Indian Standard
ALLOY STEEL CASTINGS SUITABLE FORPRESSURE SERVICE — SPECIFICATION
(Third Revision)
ICS 77.140.80
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G BIS 2006
BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
March 2006 Price Group -!$
Foundry and Steel Casting Sectional Committee, MTD 14
FOREWORD
This Indian Standard (Third Revision) was adopted by the Bureau of ‘Indian Standards, after the draft finalizedby the Foundry and Steel Casting Sectional Committee had been approved by the Metallurgical “EngineeringDivision Council.
This standard was first published in 1975 and subsequently revised in 1982 and 1984. While reviewing thestandard in the light of the experience gained during these years, the Committee decided that the standard maybe further revised. In this revision following modifications have been carried out
a) 5 new grades have been added in Table 1, and
b) Table 2, Table 3 and Table 4 have been modified.
Various clauses have also been aligned with the recent standards on steel castings.
In the preparation of this standard, assistance has been derived flom ASTM Designation: A 4871A487 M-93‘Steel castings suitable for pressure services’, issued by the American Society for Testing and Materials,
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 withIS 2:1960 ‘Rules for rounding off numerical values (revise@’. The number of significant places retained in therounded off value should be the same as that of the specified value in this standard.
,,, ,
IS 7899:2006
Indian Standard
ALLOY STEEL CASTINGS SUITABLE FORPRESSURE SERVICE — SPECIFICATION
(’Third Revisio-n)
1 SCOPE
This standard covers the requirements for normalizedand tempered, or quenched and tempered alloy steelcastings suitable for pressure containing parts requiredfor assembly with other castings or wrought steel partsby fision welding.
2 REFERENCES
The standards listed below contain provisions,which through reference in this text constituteprovisions of this standard. At the time of publication,the editions indicated were valid. All standards aresubject to revision and parties to agreement based onthis standard are encouraged to investigate thepossibility of applying the most recent editions of thestandards indicated below:
IS No.
228
1608: 2005/1S0 6892:1998
1757: ‘1988
2595:1978
3658:1999
3703:2004
4897:1994
5530:2005
6601:1987
Title
Methods of chemical analysis ofsteels (issued in various parts)
Metallic material — Tensiletesting at ambient temperature(third revision)
Method for charpy impact test(V-notch) for metallic materials(second revision)
Code of practice for radiographictesting @rst revision)
Code of practice for liquidpenetrant flaw detection (secondrevision)
Code of practice for magneticparticle flaw detection (secondrevision)
Deviations on untoleranceddimensions and mass of steelcastings (third revision)
Recommendations forproduction, rectification andrepair of steel castings by metalarc welding process (secondrevision)
Permissible deviations inchemical composition forproduct analysis of steel castings@st revision)
Acceptance standard forultrasonic inspection of steelcasting (second revision)
Acceptance standard formagnetic particle inspection steelcasting ~rst revision)
Acceptance standards for dyepenetrant inspection for steelcastings first revision)
Acceptance standards forradiographic inspection of steelcastings
3 TERMINOLOGY
3.1 For the purpose of thisdefinitions shall apply.
3.1.1 Cast (Melij — Thefollowing:
a) One furnace heat;
b) One crucible heat; or
standard, the following
product of any of the
c) A number of knace or crucible heats of similarcomposition mixed in a ladle or tapped inseparate ladles and poured simultaneously formaking a casting.
3.1.2 Batch — A group of castings of one grade ofmaterial, cast from the same melt and heat-treatedtogether under identical conditions.
4 GRADES
This standard covers a total of 16 grades (1-18 exceptgrades 3 and 5) of alloy steel castings which are furthergrouped into different classes (see Table 1) resultingin a total of 39 combinations of grades and classes ofsteel castings suitable for pressure services.
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5 SUPPLY OF MATERIAL
General requirements relating to supply of steelcastings shall beaslaiddown in IS 8800.
6 MANUFACTURE
The steel for the castings shall be made by electric arcor electric induction or such other processes as maybe agreed to between the purchaser and themanufacturer.
7 PARTICULARS TO BE SPECIFIED WHILEORDERING
For the benefit of the purchaser, particulars to bespecified while ordering the steel castings to thisstandard are given in Armex A.
8 CHEMICAL COMPOSITION
8.1 The ladle analysis of steel when carried outeither by the method specified in IS 228 and itsrelevant parts or any other established instrumental/-chemical methods shall be as given in Table 1.In case of dispute the procedure given in IS 228shall be the referee method. However, where themethod is not given in IS 228, the referee methodshall be as agreed to between the purchaser and
IS 7899:2006
the manufacturer.
8.2 The manufacturer shall carry out analysis from asample of each melt of steel and shall supply a testcertificate of chemical analysis of the sample af steelfor each melt.
8.3 Product Analysis
If specified at the time of enquiry and order, theproduct analysis may be carried out from a test pieceor from a casting representing each melt. Drillingsfor analysis shall be taken from not less than 6 mmbeneath the cast surface, and in such a manner as not .to impair the usefulness of any casting selected. Thepermissible variation in product analysis fromthe limits specified in Table 1 shall be as given inIS 6601.
8.4 Residual Elements
8.4.1 Elements not specified in Table 1 shall notordinarily .be added to the steel and all reasonableprecautions shall be taken to prevent contaminationfrom the scrap etc, to keep them as low aspracticable.
8.4.2 The limits given in Table 2 shall apply for theelements not specified in Table 1.
Table 2 Residual Etements
(Clause 8.4.2)
Constituents Percent, Mu-r For -Grades
Cu 0.20 18
0.50 Allgrades except Grade 18
Nl 0.50 l,2and9
(1 0.20 18
0.35 land2
0.40 16and 17
Mo 0.10 18
Mo+W 0.25 1
w 0.10 All grades except Grade 1
v 0.02 18
0.03 2,4,6,8,9, 10, 14, 15, 16and 17
0.05 12and 13
Totalcontent 1.0 l,2and9
0.75 16and 17
0.60 4,6,7,8 and 10
0.50 11, 12, 13, 14, 15and 18I.
3
IS 7899:2006
8.4.3 Analysis and reporting of the analysis in thetest certificate for the residual elements shall be doneonly when so specified by the purchaser in the enquiryand order. However, the manufacturer shall ensurethat the residual elements are within the limits,specified.
9 WORKMANSHIP AND FINISH
9.1 The castings shall be accurately moulded inaccordance with the pattern or the working drawingssupplied by the purchaser with the addition of suchletters, figures and marks as may be specified.
9.2 The purchaser shall specify the tolerances on allimportant dimensions. On other dimensions,tolerances specified in IS 4897 shall apply.
10 FREEDOM FROM DEFECTS
10.1 All castings shall be free from defects that willadversely affect machining or utility of castings.
10.2 When necessary to remove risers or gates byflame or arc or a combination thereof, or by any otherprocess involving intense heat, care shall be taken tomake the cut at a sufficient distance from the body ofthe casting so as to prevent any defect being introducedinto the casting due to local heating. Any suchoperation is preferably done before final heattreatment.
10.3” In the event of any casting proving defectivefrom foundry causes in the course of preparation,machining or erection, such a casting maybe rejectednotwithstanding any previous certification ofsatisfactory testing and/or inspection.
11 FETTLING AND DRESSING
13 MECHANICAL TESTS
13.1 The mechanical properties specified are thosewhich are to be obtained from test bars cast eitherseparately from or attached to the castings to whichthey refer and heat -treated as given in 12. The testvalues so exhibited, therefore, represent the quality ofsteel from which the castings have been poured; theydo not necessarily represent the properties of thecastings themselves.
13.2 The tensile test shall be carried out in accordancewith IS 1608. The relevant mechanical properties shallbe as given in Table 4.
13.3 Charpy V-Notch Impact Test
If specified by the purchaser at the time of enquiryand order, the impact test may be done as per IS 1757at a test temperature agreed upon the manufacturerand the purchaser. If charpy impact test is specifiedfor Grades lB, 2B, 4B, 6B, 7A, 8B, 9B and 10B,impact properties shall be determined by testing a setof three charpy ‘V’ notch impact specimens -at atemperature not higher than 46”C. Other temperaturesmay be used by agreement between the manufacturerand the purchaser. The average energy value ofthe three specimens shall not be less than 20J withnot more than one permitted below 20J and none below10J. Other impact values may be specified byagreement between the manufacturer and the.,. ,purchaser.
14 HYDRAULIC TEST
14.1 When so specified by the purchaser in the enquiryand order, a hydraulic test shall be carried out. Thedetails of the test shall be as agreed to between thepurchaser and the manufacturer.
All castings shall be properly fettled and dressed, and 14.2 The castings shall not -peened, plugged orall surfaces shall be thoroughly cleaned. impregnated to stop leakages. However, unless
12 HEAT TREATMENT otherwise specified at the time of enquiry and order,rectification and upgradation of a casting +y welding
12,1 The castings shall be heat-treated in a properly may -be carried out in accordance with the approvedconstructed furnace, having adequate means procedures as laid down in the relevant clause of theof temperature control which shall permit the standard.whole of the castings being uniformly heated to thenecessary temperature. All castings shall be suitablyheat treated so as to attain the specified mechanicalproperties.
12.2 Unless otherwise specified in the enquiry -andorder or agreed to between the purchaser and themanufacturer, all castings shall receive a heattreatment as indicated in Table 3. Preliminary heattreatment prior to final heat treatment as well asmultiple tempering are permitted.
12.3 Heat treatment shall be performed after castingshave been allowed to cool below the transformationrange.
15 NON-DESTRUCTIVE TESTS
15.1 Non-destructive testing shall be applied, if sospecified in the enquiry and the order. Under thisheading are grouped the tests, which aim at revealingdefects which cannot be revealed by a simple visualexamination, such as dye penetrant, magnetic particleultrasonic, “X-radiographic, or gamma-radiographicinspection; also included under this heading are testson the surface condition by visual or visual-tactileexamination. The purchaser shall specify in theenquiry and order:
a) Type of non-destructive testing which be intendsto carry out or to have carried out;
Grade Class Austentising Quenching Quenching TemperingTemperature, Medium to Below TemperaturelJ
Min, “C T “c
(1) (2) (3) (4) (5) (6)
13 B 1010 Air or liquid 95 665-690’J
565-6202)
14 A 900 Air 315 595
14 B 900 Liquid 315 595
15 A 955 Ah 315 595
15 B 955 Liquid 205 595
16 A. 845 Air 260 595
16 B 845 Liquid 260 595
17 A 845 Liquid 260 595
18 A 870 Air 315 595
I) Minimum temperature unless rmge iSSpecified.
2, DOubletemper, aircoo] to95”Cafier the first temPer.
b)
c)
d)
e)
Area or areas of the casting to which these testsapply; and the types of discontinuity, whererelevant;
Whether all, or what proportion, of the castingsare to be tested;
Severity level defining the acceptability ornon-acceptability of defects which may berevealed, and
Whether the manufacture is or is notcontractually responsible for carrying out thetests.
15.2 Unless otherwise agreed upon, when non-destructive testing is to be done, the castings shall beexamined as follows:
a) Ultrasonic examination as per IS 7666;
b) Magnetic particle examination as per IS 3703;
c) Dye penetrant examination as per IS 3658; and
d) Radiographic examination as per IS 2595.
15.3 Unless otherwise agreed upon the following shallbe the acceptable standards:
a) IS 9565 for ultrasonic inspection,
b) IS 10724 ‘for magnetic particle inspection,
c) IS 11732 for dye penetrant inspection, and
d) IS 12938 for radiographic inspection.
16 REPAIR OF CASTINGS
16.1 Unless otherwise specified by the purchaserin the enquiry and order, castings may be rectifiedby welding. All repairs by welding shall be carriedout in accordance with the procedure laid down inIS 5530. If castings have been subjected to non-destructive or hydraulic testing by agreementbetween the purchaser and the manufacturer, thecastings shall be re-examined in the area of repairfollowing any rectifying operation performed on thecastings.
16.2 To form the basis of an agreement between thepurchas-er and the supplier in this respect, whererelevant, the following classifications shall applyconcerning the extent of repair:
a)
b)
6
Weld repair involving a depth non-exceeding20 percent of wall thickness or 25 mm,whichcwer is lower, shall be termed as a minorrepair,
Any weld repair exceeding the above shallbe termed as a major repair. Further, anysingle repair having an area exceeding 250 mmsquare for every millimetre of wall thicknessshall also be deemed to be a major repair,regardless of the considerations mentioned in16.2-(a).
IS 7899:2006
Mechanical Properties of Alloy Steel Castings Suitablefor Pressure SeN-ice
(Clause 13.2).
Previous Grade Class Tensile Yield Elongation, Reduction Hardness
Designation Strengthll Strength, Percent, in Area, RCMPa, A&I MPa, Min kfin G.L &fin (BHN)
5.65 ~ Max
(1) (2) (3) (4) (5) (6) (7) (8)
IN 1 A 585-760 380 20 40
IQ 1 B 620-795 450 20 45
1 c 620 450 20 45 22(225)
2N 2 A 585-760 365 20 35
2Q 2 B 620-795 450 20 40
2 c 620 450 20 40 22(235)
4N 4 A 620-795 415 17 40
4Q 4 B 725-895 585 16 35
4 c 620 415 17 35 22(23$)
4 D 690 515 16 35 22(235)
4QA 4 E 795 655 14 35
6N 6 A 795 550 17 30
6Q 6 B 825 655 11 25
7Q+ 7 A 795 690 14 30
8N 8 A 585-760 380 18 35
8Q 8 B 725 585 16 30
8 c 690 515 16 35 22(235)
9N 9 A 620 415 17 35
9Q 9 B 725 585 15 35
9 c 620 415 17 35
9 D 690 515 16 35 22(235)
9 E 795 655 14 35 22(235)
7
Table 4 — Concluded
Previous Grade Class
Designation
(1) (2) (3)
10Q 10 B1 1
11 B
I 111 c
I I
I 11 ID
-F--w+-t-H-+
15Q 15 B
1 I
16N 16 A
,6QI,61B
17 17 A
I I
18N 18 A
Tensile Y}eld Elongation, Reduetion Hardness
Strength]) Strength, Percent, in Area, RC
MPa, &fin MPa, Min &finG.L Min (BHN)
5.65 & Max
(4) I (5) I (6) I (7) I (8)
690 I 485 I 17 I 35 I
860 690 14 35 \1 1 1 ,
965-1170 895 9 25
620-795 450 17 30
620 415 17 35 22(235)
1 I 1 1
620-795 I 450 I 17 I 30 I
760-930 1 5,5 1 14I
35 I 22(235)
690 520 16 35
.,
484-655 I 275 I 18 I 35 I
725-895 585 16 35
484-655 275 18 35
725-895 585 16 35
620-795 415 17 35
725-895 585 16 35
825-1000 655 13 30.
485-655 275 20 35
u Except to where range is.given.
8
16.3 Carbon Equivalent
Unless otherwise specified in the enquiry and order,or otherwise agreed to, the Carbon Equivalent (C.E.)for the purpose of guidance in determination of thepre-and post-weld treatment applicable to carbon andlow alloy steels, shall be computed as follows:
Mn Cr+Mo+V Ni+CuC.E. = C~ ~+
6 5 15
NOTE — In case of high alloy steels the formula for computingcarbon equivalent shall be subject to agreement between theparties.
17 METHOD OF SAMPLING
The method of sampling the steel castings for thepurpose of chemical analysis and mechanical testsincluding re-test shall be in accordance with IS 6907.
18 MARKING
18.1 Each casting shall be legibly marked with thefollowing:
a) Number or identification mark by which it is
b)
c)
IS 7899:2006
possible to trace the melt and the heat treatmentbatch from which it was made;
Manufacturer’s initials or trade-mark; and
Other identification marks in accordance withthe agreement between the purchaser and themanufacturer.
NOTE — It is recommended that a minimum of markings beused.
18.2 By agreement between the purchaser and themanufacturer, castings complying with therequirements of this standard may, after inspection,be legibly marked with an acceptance mark.
18.3 BIS Certification Marking
The castings may also b.e marked with the StandardMark.
18.3.1 The use of the Standard Mark is governedby the provisions of the Bureau o~Indian StandardAct, 1986 and the Rules and Regulations madethereunder. The details of conditions under which thelicence for the use of the Standard Mark maybe grantedto manufacturers or producers, may be obtained fromthe Bureau of Indian Standards.
ANNEX A
(Clause 7)
INFORMATION TO BE SUPPLIED BY THE PURCHASER
A-1 BASIS FOR ORDER c)
While pIacing an order for the purchase of steel d)
castings covered by this standard, the purchaser shouldspecifi the following:
a) Material specification; e)
b) Drawing or reference number of the pattern (if osupplied by the purchaser), along with a copy g)of the drawing;
Optional/Additional tests required, if any;
Whether the castings are to be inspected andtested in the presence o-f the purchaser’srepresentative;
Condition of delivery;
Any special requiremen~; and
Test report.
9
Bureau of Indian Standards
BIS is a statutory institution established under the Bureau of Zndian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goods andattending 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 formwithout the prior permission in writing of BIS. This does not preclude the flee use, inthe course of implementingthe standard, of necessary details, such as symbols and sizes, type or grade designations. Enquiries relating tocopyright 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 reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of‘BIS Catalogue’ and’ Standards: Monthly Additions’.
This Indian Standard has been developed from Dot: No. MTD “14 (4578).
Amendments Issued Since Publication .
Amend No. Date of Issue Text Affected
.,, ,
BUREAU OF INDIAN STANDARDS
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