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है”ह”ह

IS 5791 (2006): Internal combustion engines - Piston rings- Material specifications [TED 2: Automotive Primemovers]

—.——

IS 5791:20061S0 6621-3:2000

Indian Standard

INTERNAL COMBUSTION ENGINES — PISTONRINGS — MATERIAL SPECIFICATIONS

( Third Revision)

ICS 43.060.10

@ BIS 2006

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

~U/y 2006 Price Group 2

I

Automotive Primemovers Transmissions and Steering Systems and Internal Combustion Engines

Sectional Committee, TED 2

,NATIONAL FOREWORD

This Indian Standard (Third Revision) which is identical with ISO 6621-3:2000 ‘Internal combustionengines — Piston rings — Part 3: Material specifications’ issued by the International Organization forStandardization (ISO) was adopted .by the Bureau of Indian Standards on the recommendation of theAutomotive Primemovers Transmissions and Steering Systems and Internal Combustion Engines-Sectional Committee and approval of the Transport Engineering Division Council.

The Sectional Committee decided to align the Indian Standard with the corresponding InternationalStandard wherever feasible and wherever the domestic considerations were not so intense so as tohave standards different from the ISO Standards. This decision was taken with a view to upgrade thequality of the products in line with the International Standards.

This standard was first published in 1970 and subsequently revised in 1977 and then in 1986. The thirdrevision was undertaken due to revision of base standard. In this revision, the following technical changeshave been incorporated:

a) Table of Typical materials for piston rings had been modified.

b) Hardness in terms of Vickers, Rockwell and Brinell is given for respective materials.

c) Combinations of Typical modulus of elasticity and Bending strength is extended.

d) Typical applications for respective categories have been provided.

The text of ISO Standard has been approved as suitable for publication as an Indian Standard withoutdeviations. Certain conventions are, however, not identical to those used in Indian Standards. Attentionis particularly drawn to the following:

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

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

In this adopted standard, reference appears to the following International Standard for which IndianStandards also exist. The corresponding Indian Standards which are to be substituted in its place aregiven below along with Iheir degree of equivalence for the editions indicated:

International Standard Corresponding Indian Standard Degree ofEquivalence

(IS 1501 (Part ~) :1984 Method for Vickers 1

ISO 6507-1 : 1997 Metallicmaterials —Vickers hardness test— Part 1 : Test method

1-1

\

hardness test for metallic materials: Part 1HV 5 to HV 100 (second revision)

IS 1501 (Part 2) :1984 Method for Vickershardness test for metallic materials:Part 2 HV 0.2 to less than HV 5 (secondrevision)

IS 1501 (Part 3) : 1987 Method forVickers hardness test for metallic materials:

~ Part 3 Less than HV 0.2 (second revision) ,

Technically> Equivalent

For the purpose of deciding whether a particular requirement of this standard is complied with, the finalvalue, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordancewith IS 2 : 1960 ‘Rules for rounding off numerical values (revised)’. The number of significant placesretained in the rounded off value should be the same as that of the specified value in this standard.

IS 5791:2006ISO 6621-3:2000

Indian Standard

INTERNAL COMBUSTION ENGINES — PISTONRINGS — MATERIAL SPECIFICATIONS

( Third Revision)

1 Scope

This part of 1S0 6621 classifies materials intended for the manufacture of piston rings, based on their mechanicalproperties and the stresses the materials are capable of withstanding.

This part of ISO 6621 is applicable to piston rings for reciprocating internal combustion engines up to and includingthose of 200 mm in diameter. It is also applicable to piston rings of compressors working under similar conditions.

2 Normative reference

The following normative document contains provisions which, through reference in this text, constittile ~rovi$lons ofthis part of ISO 6621. For dated references, subsequent amendments to, or revisions of, any of these pl.d$iiationsdo not apply. However, parties to agreements based on this part of 1S0 6621 are encouraged tQ investigate thepossibility of applying the most recent edition of the normative document indicated below. For undated rSferen@s,the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers ofcurrently valid International Standards. .

ISO 6507-1, Metallicmaterials — Vickers hardness test — Part 1: Test method.

3 Mechanical properties

The choice of material made in accordance with the mechanical strength criteria given in Table 1 shall also takeinto account the final coating of rings, engine characteristics (rating, liner surface, etc.) and microstructural featuressuch as graphite, cementite and ferrite.

1

IS 5791:2006ISO 6621-3:2000

Table 1 — Piston-ring materials and their mechanical properties

Mechanical properties Msteriel

MPa or N/mn#

1sss Typical Minimum Type Minimum Speoiflc detaile Subclsss Typical applications

modulus of ben~ing hardness a Code

elasticity strengthHV30 HRB HRC

900Q0 300 200 93 — Mcll Compres&rn, scraper

10 90000 350 Grey cast iron 205 95 — Non-heat-treated MC 12 and oil controlrings

1000OO 390 205 95 — MC 13

450 255 —“ 23 MC 21

450 290 — 28 MC 22

20 115000 450 Grey cast iron 390 — 40 Heat-treated MC 23 Compressionand scrape!

500 320 — 32 MC 24 rings

130000 650 365 — 37 MC.25

30 145000 550 Carbidiccast iron 265 — 25 Heat-treated peariitic MC 31

500 300 — 30 Heat-treated martensitic “MC32

600 210 95 — Heat-treated pearlitic MC 41

600 250 — 22 Heat.treated mertensitic MC 42

40 160000 600 Malieable cast iron 300 — 30 Heat.treated martensitic MC 43

1000 280 — 27 Heat-treated carbidic MC 44

1100 255 — 23 Heat-treated martensitic MC 51 Compressionrings,

1300 255 — 23 Heat-treated martensitic MC 52 scraper ringsand narrowwidthoii-controirings

50 160000 1300 Spheroidalgraphite 290 — 28 Heat-treated martensitic MC 53

1300 cast iron 210 95 — Peartitic MC 54

225 97 — Ferritic MC 55

1300 345 — 35 Heat-treated marlensitic MC 56

370 — 38 CrMoV-alloyed MC 61 Compressionrings

390 — 40 CcSi-alloyed MC 62 Coil springsandcompressionrings

485 — 48 CrSi-ailoyed MC 63 Compressionrings

450 — 45 CrSi-alloyed MC 64 Compressionrings

60 21OOOO — Steel 270 — 26 Martensitic (11 % Cr MC 65 Compressicm,oil-controlmin.) ri~gsand segments

270 — 26 Martensitic(17% Cr MC 66 Co~pression ringsandmin.) segments

—o — — Austenitic(16 % Cr min.) MC 67 Expanders

450 b— — Unalloyed MC 68 Expanders/spacersandsegments

1 The hardness values are averages from three measurements on one ring, one being at the gap and the others 90” and 180° around frorrhe gap. HV30 hardnesstestingis in accordancewith ISO 6507-1. -HRB and HRC are given for reference only. The application of the?ardnaes measuring methods HRB and HRC is restricted,due to the geometry and the material of piston rings. The hardness values staterare used only for classifyhg.the materialsintothe individualsubclasses. Other hardness-measuringmethods and their equivalentvaluesshalw agreed between manufacturerand client.

All hardnass figures refer to the finishedpistonrings and segments. However, in the case of nitrided steel rings the given hardness figure:sppiyto the core hardness only.

‘ Hardness for expanders depends on-the manufacturingprocess. Values for finished pads shall be agreed between manufacturer antclient.

2

Is 5791:2006ISO 6621-3:2000

Bibliography

,

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

[13]

-[14]

[15]

ISO 6621-1 :—l j, Internal combustion engines — Piston rings — Part 1: Vocabulary.

ISO 6621 -2:— 2), Internal combustion engines — Piston rings-— Part 2: Inspection measuring principles.

3), Internal combustion engines — Piston rings — Part 4: General specifications.ISO 6621 -4:—

4), Internal combustion engines — Piston rings — Part 5: C?uality requirements.ISO 6621-5:—

5), Internal combustion engines — Piston rings —ISO 6622-1 :— Part 1: Rectangular rings made of castiron.

ISO 6622-2:— 6), Internal combustion engines — Piston rings — Part 2: Rectangular rings with narrow ringwidth.

ISO 6623:— 7), Internal combustion engines — Piston rings — Scraper rings made of cast iron.

ISO 6624-1 :—a), Internal combustion engines — Piston rings — Part 1: Keystone rings made of cast iron.

ISO 6624-2:—9), /nterna/ combustion engines — Piston rings — Pati 2: Half keystone rings made of castiron.

ISO 6624-3:—1 o), Internal combustion engines — Piston rings — Part 3: Keystone rings made of steel

ISO 6624-4:— 10), /nterna/ combustion engines — PiStOf) rkJS — Part4: Half keystone rings made of steel.

ISO 6625:1986, Internal combustion engines — Piston rings — Oil control rings.

ISO 6626:1.989, Internal combustion engines — Piston rings — Coil-spring-loaded oil control rings.

ISO 6626-2:— 10, Internal combustion engines — Piston rings — Part 2: Coil-spring-loaded oil control ringsof narrow width made of cast iron.

ISO 6627:— 10), /nterna/ combustion engines — Piston rings — Expander/segment oil-control rings.

1) To be published. (Revision of ISO 6621-1:1986)

2) To be published. (Revision of ISO 6621-2:1984)

3) To+e published. (Revision of ISO 6621-4:1988)

4) To be published. (Revision of ISO 6621-5:1988)

5) To be published. (Revision of ISO 6622-1:1 986)

6) To be published. (Revision of LSO 6622-2:1988)

7) To be published. (Revision of ISO 6623:1986)

8) To be published. (Revision of ISO 6624-1:1 986)

9) To be published. (Revision of ISO 6624-2:1988)

10) To be published.

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of /ndian 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 the course

of implementing the standard, of necessary details, such as symbols and sizes, type or grade

designations. Enquiries relating to copyright be addressed to the Director (Publications), 61S.

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

This Indian Standard has been developed from Doc: No. TED 2 (477).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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