A 1210

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Australian Standard®

SAA Unfired Pressure Vessels Code

STANE )ARI )S AL r 1 kALIA

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I his '\iisii.ilitii Standard was prepared by Committee ME/I, Boilers and UnfiredI'I'ssiIIt 'esscIs. It was approved on behalf of the Council of Standards Australiatin II ApiiI 19M8 uid published on 20 February 1989.

lii Iolliiwiiig interests are represented on Committee ME/I:

Aliiiiiiiiiiim l)evelopment Council

Aiisi ralasian Institute of Metals

Atist ralian Compressed Air Institute

Australian Institute for Non-destructive Testing

Australian Institute of Energy

Australian Institute of Petroleum

Australian Liquefied Petroleum Gas Association

Australian Valve Manufacturers Association

Australian Welding Institute

Australian Welding Research Association

Boiler and Pressure Vessel Manufacturers Association of Australia

Bureau of Steel Manufacturers of Australia

Confederation of Australian Industry

Department of Defence

Department of Industrial Affairs, QId

Department of Industrial Relations and Iniployment , N .5W.

Department of Labour, S.A.

Department of Labour, Vie.

Department of Labour and industry, las.

Department of Occupational Health, Safety and Veliare. \\.A.Department of Territories

Electricity Supply Association ni Australia

Institution of Engineers, ALISt ralia

Insurance Council of Aus talia

Metal Trades Industry Association of Aistialia

National Association of lest lug Ant liorit ics, Ansi

Railways of Australia ('otnuhittee

Society of Mechanical Engineers ot Ansi ialasia

Sugar Research Institute

Work Health Authority, N.!.

Review of Australian Srandards. To keep abreast of progress iii j,,du.ctri'. Aus(,,,/ia,, .Stu,u/arnis (1/i' SIlh/('('tto periodic review and are kept up-to-date by the issue of wnend,nents ,,r pun ,'iluu,n,s u.s II ('pt'5s(IFp. Itis important therefore that Standards users ensure that they are in poss'es'sion uf (1w latest edition. antiany amendments thereto.Full details of all Australian Standards and related publications will b'/ouiul in the btwula,ds I ustraliaCatalogue of Publications; this information is supplemented each inonh by the magazine I/n' .I ,,sirulianStandard', which subscribing members receive, and which gives details of new publications. lien ('(11111,115and amendments, and of withdrawn Standards.Suggestions for i,nprovements to Australian Standards, addressed to the head office of Standards A ustralia,are welcomed. Notification of any inaccuracy or ambiguity found in an A ustrulian Standard should bemade without delay in order that the matter may be investigated and appropriate aetlo,, taken.

This Standard was issued in draft form for comment as DR 85020.

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STANDARDS AUSTRALIA

17 AUG1994

SYDNEY INFO. CENTFE

STANDARDS AUSTRALIA

Amendment No. 4to

AS 1210-1989Unfired Pressure Vessels

(known as the SAA Unfired Pressure Vessels Code)

CORRECTION

The 1989 edition of AS 1210 is amended as follows; the amendment(s) should be inserted in the appropriateplace.

SUMMARY: This Amendment applies to Figure 3.15.1, Clause 3.21.6.2 and Appendix Q.

Published on 15 Au-

- v-%usrIc?

-6 J/N 334

INpo C STANDARDS AUSTRALIA

Amendment No. 3to

AS 1210-1989Unfired Pressure Vessels

(known as the SAA Unfired Pressure Vessels Code)

REVISED TEXT

The 1989 edition of AS 1210 is amended as follows; the amendments should be inserted in the appropriateplace.

SUMMARY: This Amendment applies to Contents, Clause 1.3, Tables 1.7, 2.1(A), Clause 2.4.1, Figures2.6.2(A) and (B), Clause 2.6.5.3, Figure 2.6.4, Clauses 3.1.3, 3.2.1.3, 3.2.3, 3.2.4.1, 3.4.1, 3.4.2, Tables3.3.1(A), 3.3.1(B), 3.3.1(E), 3.4.3, Clauses 3.5.1.4.3, 3.7.5, 3.9.1, 3.9.2, 3.9.5, 3.9.6.1, 3.9.6.2, Table 3.9.3,Figure 3.9.6.1, Clauses 3.10.6.2, 3.11.1, 3.13.3, Figure 3.15.1, Clause 3.15.5.2, 3.15.5.4, 3.15.5.5, 3.16.6,3.17.1, 3.17.2, 3.17.3, 3.17.4, 3.17.5, 3.17.6, 3.17.7, 3.17.11.5, 318.2, Figure 3.17.11, Clause 3.18.5.4,Figure 3.18.5, Clause 3.18.10.4, Figure 3.18.10, Clauses 3.19.4.7, 3.19.10.2, 3.20.1, 3.20.2, 3.20.3, 3.20.5,3.20.7, Table 3.20.5, Clauses 3.21.2, 3.21.3.1, Figure 3.21.3, Table 3.21.5, Clause 3.21.6.2, Figure 3.21.6.2,Tables 3.21.6.5, 3.21.6.4(A), (new) Clause 3.21.12, Figure 3.21.12.2, Clause 3.24.2, Figure 3.24,Clauses 3.24.4, Figure 3.25(B), Clauses 3.25.3, 3.26.7.1, 3.26.7.2, 4.1.7.4, 4.2.4, 4.2.7.2, 4.2.8, 4.2.17.4,Table 4.2.17.3, Clauses 4.2.17.12, 4.2.17.14, Section 5, Clauses 8.2.1, 8.2.2.1, 8.4.3, 8.6.2(a), 8.6.2(b),8.14.1, Paragraphs A3.5, A5, A6, A6.1, A6.2, Appendix I, Appendix F, (new) Appendix Q, Appendix R.

IMPLEMENTATION: This Amendment to this Standard is intended to apply to the design and manufactureof pressure vessels carried out after the date of publication but it should not be applied on a mandatory buisbefore 13 June 1994 (see Note 1) or applied retrospectively (ice Note 2).

NOTES:

1 The implementation date(s) required by some Inspecting Authorities may vary from the above dates.

2 Implementation in respect to work in progress should be negotiated between the parties concerned.

Published on 13 December 1993.

AS 1210/Amdt 4/1994-08-15

AS 1210/Amdt 3/1993-12-13

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The 1989 edition of AS 1210 is amended as follows; the amendments should be inserted in the appropriate place.SUMMARY. This amendment applies to Contents, Clause 1.3, Table 1.7, Clauses 1.12, 2.2, Tables 2.1, 2.1(A), 2.1(F), Figures 2.6.2(A)and (B), Table 2.6.3, Clauses 3.2.1.1, 3.2.1.4, 3.2.2.4, Table 3.3.1(A), Clauses 3.5.1.1, 3.9.2, 3.9.6, 3.12.3, 3.14.1, 3.14.2, 3.14.3, 3.17.10.1,3.17.11.1, 3.18.5.4, 3.18.7.1, 3.18.9.3, 3.18.12.1, 3.19.3.2, 3.19.4, 3.19.4.4, 3.19.4.7, 3.19.4.8 (new), Figure 3.19.4, Clauses 3.19.6.2, 3.19.10,2,Figures 3.21.3, 3.21.6.2, Clauses 3.21.10, 3.26.3.1, 3.26.4, 3.27, 3.28 (new), 3.29 (new), 4.1.6.6, 4.1.7.1, 4.1.9, 4.1.9.5, Table 4.2.10,Clause 4.2.13, Tables 4.2.17.3, 4.2.17.16, Clauses 5.2.2.2, 5.2.3, Table 5.2.9, Clause 5.3.4.2, Tables 5.3.3, 5.3.4(A), 5.3.4(B), 5.14.2,Clauses 8.4.3, 8.6.2, 8.6.4, Appendices K, F, Q, R.

Published on 12 November 1990.

Amendment No. 2to

AS 1210-1989Unfired Pressure Vessels

(known as he SAA Unfired Pressure Vessels Code)

REVISED TEXT

The 1989 edition of AS 1210 which was amended in November 1990, is further amended asfollows; the amendments should be inserted in the appropriate places.

SUMMARY: This Amendment applies to Clause 8.6.2(a) and Appendix R.

Published on 10 June 1991.

Amendment No 1to

AS 1210-1989SAA Unfired pressure vessels code

REVISED TEXT

AS 12l0/Anidt 2/1991-06-10

STANDARDS AUSTRALIA

AS 1210/Amdt 1/199(1.11-12

STANDARDS AUSTRALIAIncorporated by Royal Charter

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HISTORY OF AS 1210

First published as part of AS CBT - 1931.Second edition 19"1AS CB1, Part V first published 1954AS CB1 - 1952 revised and redesignated

AS CBI, Parts I-IV - 1952.

AS B122 first published 1956(endorsement of BS 1099 - 1943 with amendment).

Second edition 1962.

AS B122 - 1962,' parj of AS CB1,' 'Parts I-IV - 1952and AS CB1, Part V - 1951 revised, amalgamatedand redesignated AS 1210 - 1972.

Second edition 1977.Third edition 1982.Fourth edition 1989.

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Australian Standard®

AS 1210-1989

Unfired Pressure Vessels

(known as the SAA Unfired PressureVessels Code)

For history before 1972 see Preface.AS 1210 first published-1972.Second edition 1977.Thtrd edition 1982.Fourth edition 1989.

PUBLISHED BY STANDARDS AUSTRALIA(STANDARDS ASSOCIATION OF AUSTRALIA)STANDARDS HOUSE, 80 ARTHUR ST, NORTH SYDNEY NSW

ISBN 0 7262 5119 4

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AS lZtO-19$9 2

PREFACE

This edition of this Standard was prepared by the Standards Australia Committeeon Boilers and Unfired Pressure Vessels to supersede AS 12 10-1982. The Standardwas first published in 1972 as part of the program of revision and metrication ofthe SAA Boiler Code which at that time was designated AS CB 1. This Standard formspart of the revised SAil Boiler Code which is referenced as AS 1200 and coversrequirements for water tube, fire tube, shell and miscellaneous boilers, unfired pressurevessels, piping, welder certification, and related matters. The SAA Boiler Code isreferred to in statutory regulations within Australia.Revisions and additions contained in the published amendments to the 1982 editionof this Standard, together with subsequent revisions and additions approved by thecommittee, have been included in this edition.The changes introduced include extensive editorial modifications to align with currentStandards Australia practice and a number of important technical changes, includingthe addition, revision or clarification of the scope and requirements for mixed classesof construction, materials, corrosion allowance, design for specified lifetimes in thecreep range, low temperature service, clad vessels, design strengths and the basis fortheir determination, manway doors, tube holes, openings, jacketed vessels, rearbumpers for tankers, heat treatment, impact testing, non-destructive examination,and the manufacturer's data report form.Minor changes have been made in the welding procedure requirements, includingrelevant postweld heat treatment requirements, principally to align with world practice.It is not intended that approved welding procedures will be invalidated by these changesnor that the changes will be applied retrospectively.Provision has been retained in Clause 3.17 for the future replacement of those partsof the clause omitted from the 1982 edition of the Standard for copyright reasons.A new method of design of flat tube plates is in the course of preparation.All references to riveted construction was withdrawn from this Standard of the 1982edition as this type of construction is rarely used at the present time. For guidance,reference may be made to the now superseded AS CBIPart 1, Boilers other thanwater tube boilers and locomotive boilers for railway purposes, reference copies ofwhich are available at the Standards Australia Information Centres.The clauses, tables and figures that have been subject to technical change in thisedition, i.e. subsequent to the issue of Amendment No 2 to AS 1211)I 982 are listedin 'Technical Changes' following the Index.The Standard follows in principle other codes forming part of the SAil Boiler Codein giving guidance to manufacturers, statutory authorities and users in the form ofminimum engineering requirements which are necessary for the sale design,construction and installation of unfired pressure vessels. In special instances additionalrequirements may be necessary for adequate performance or safety.The requirements in this Standard have been formulated to afford reasonably certainprotection of life and property and to indicate where a margin for deterioration inservice may be needed so as to give a reasonably long, safe period of usefulness. TheStandard takes into consideration advancements in design and materials, and theevidence of experience.

The Standard contains basic data necessary for design, including material specification,design parameters, requirements for fabrication, testing and inspection. Theserequirements are specified in terms of principles to the fullest practicable extent,supplemented where necessary by further detail to obtain uniform interpretation ofprinciple and guidance on best methods. In other areas the Standard indicates wherecaution is necessary but a direct prohibition would be unwise at the present level ofknowledge.

The Standard incorporates the class system of vessels based on different qualitiesof classes of construction, and has attempted to give basic principles to indicate wheresuch classes should be used. Three main classes are adopted using the present levelof stress (safety factor of 4 approximately). An additional class of vessel, i.e. ClasslH, may be produced in accordance with AS 1210, Supplement No I, which permitsthe use of design stresses higher than those contained herein.The specific design requirements of the Standard are based on a simplified engineeringapproach and are intended to be the standard methods of design. However, in specialinstances, particularly where guidance is not provided in this Standard, other methodsmay be used provided that the validity of the design is satisfactorily established.

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No rules of construction can be written in sufficient detail to ensure good workmanshipin construction. Each vessel manufacturer is responsible for taking every necessarystep to make sure that the quality of workmanship and construction is such as willensure compliance with good engineering practice.The user will also need to consider many factors beyond those covered by this Standardin the final specification of a vessel and is cautioned that the Standard is not a completedesign handbook and that he should be aware of the need for competent engineeringjudgement.It should be noted that the Standard has been written primarily to suit conditionsin Australia where there is a strong relationship between the manufacturer (anddesigner) and the Inspecting Authority. However it is not intended to weaken theimportant link between these parties and the purchaser, who will be concerned withmany other aspects beyond the scope of this Standard and who may require additionalor alternative requirements; but such requirements must not be less than those alreadyspecified in the Standard and must meet the requirements of the Inspecting Authorityin the State where the vessel is to be operated. Statements of above requirementsshould form part of the contract documents between the purchaser and manufacturer.Users of this Standard are reminded that it has no legal authority in its own right,but may acquire legal standing in one or more of the following circumstances:

Adoption by a government or other authority having jurisdiction.Adoption by a purchaser as the required standard of construction when placinga contract.Adoption where a manufacturer states that a vessel is in accordance with thisStandard.

Acknowledgement is gratefully made to the American Society of Mechanical Engineersfor permission to reproduce certain extracts from the ASME Boiler and Pressure VesselCode. In addition, acknowledgement is made of the considerable assistance providedby British and other national Standards.For low hazard vessels up to 150 L in volume, AS 2971, Serially produced pressurevessels, provides an alternative method for assessing the safety of pressure vesselsto the method given in this Standard (AS 1210). For automotive applications,AS 3509, LP gas fuel vessels for automotive use, (which has superseded InterpretationNo Ito AS 12 10-1972, Fuel vessels for LPgczsfor internal combustion engines) maybe used.Statements expressed in mandatory terms in Notes to tables and figures are deemedto be requirements of this Standard.

AS 1210-1989

© Copyright - STANDARDS AUSTRALIA

Users of Standards are reminded that copyright subsists in all Standards Australia publications and software. Except where theCopyright Act allows and except where provided for below no publications or software produced by Standards Australia may bereproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in writing from StandardsAustralia. Permission may be conditional on an appropriate royalty payment. Requests for permission and information oncommercial software royalties should be directed to the Head Office of Standards Australia.

Standards Australia will permit up to 10 percent of the technical content pages of a Standard to be copied for use exclusivelyin-house by purchasers of the Standard without payment of a royalty or advice to Standards Australia.Standards Australia will also permit the inclusion of its copyright material in computer software programs for no royaltypayment provided such programs are used exclusively in-house by the creators of the programs.

('are should be taken to ensure that material used is from the current edition of the Standard and that ii is updated whenever theStandard is amended or revised. The number and date of the Standard should therefore he clearly identified.Ihe usc of material in print form or in computer software programs to be used cumnwrcially, with or without payment, or incuinniercial contracts is subject to the paymetit ol a royalty. ilits policy may he varied by Standards Australia at any time.

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AS 1210-1989 4

CONTENTS

Page

FOREWORD ............ 7

SECTION 1. SCOPE AND GENERAL REQUIREMENTS

1.1 SCOPE 8

1.2 PURPOSE OF STANDARD 8

1.3 APPLICATION 8

1.4 INTERPRETATION OF STANDARD 9

1.5 NEW DESIGNS, MATERIALS AND CONSTRUCTIONMETHODS 9

1.6 CLASSES OF VESSEL CONSTRUCTION ............91.7 APPLICATION FOR VESSEL CLASSES AND TYPES 9

1.8 DEFINiTIONS 10

1.9 UNITS 13

1.10 NOTATION ....................................131.11 INFORMATION TO BE SUPPLIED BY THE PURCHASER

AND MANUFACTURER 13

1.12 DESIGNATION 13

1.13 REFERENCED DOCUMENTS 13

SECTION 2. MATERIALS

2.1 MATERIAL SPECIFICATIONS 14

2.2 STANDARD COMPONENTS ........................142.3 ALTERNATIVE MATERIAL AND COMPONENT SPECIFI-

CATIONS 14

2.4 MATERIAL IDENTIFICATION ....................232.5 LIMITS OF APPLICATION OF MATERIALS AND COM-

PONENTS ....................................232.6 MATERIAL REQUIREMENTS FOR LOW TEMPERATURE

23

2.7 MATERIAL REQUIREMENTS FOR HIGH TEMPERATURESERVICE ....................................342.8 NON-DES1'RUCTIVE I'ESFING OF MATERIALS .... 35

SECTION 3. DESIGN

3.1 GENERAl, I)ESIGN 363.2 DESIGN CONDITIONS 36

3.3 DESIGN STRENGTHS 393.4 THICKNESS OF VESSEL WALL 403.5 WELDED AND BRAZED JOiNTS 623.6 LIGAMENT EFFICIENCY ........................753.7 THlN.WALLED CYLINDRICAL AND SPHERICAL SHELLS

SUBJECT TO INTERNAL PRESSURE AND COMBINEDLOADINGS 75

3.8 THICK-WALLED CYLiNDRICAL AND SPHERICAL SHELLSSUBJECT TO INTERNAL PRESSURE 77

3.9 CYLINDRICAL AND SPHERICAL SHELLS SUBJECT TOEXTERNAL PRESSURE ............................77

3.10 CONICAL ENDS AND REDUCERS SUBJECT TO INTERNAL86

3.11 CONICAL ENDS AND REDUCERS SUBJECT TO EXTERNALPRESSURE ....................................88

3.12 DISHED ENDS SUBJECT TO INTERNAL PRESSURE 89

3.13 DISHED ENDS SUBJECT TO EXTERNAL PRESSURE 903.14 DISHED ENDS-BOLTED SPHERICAL TYPE 93

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Page 5 ContentsAdd the following after 3.27:

3.28 METALLIC EXPANSION JOINTS 1883.29 PRESSURE VESSELS FOR HUMAN OCCUPANCY 188

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5 AS 1210-1989

Page

3 15 EJNSTAYED FLAT ENDS AND COVERS 95

3.16 STAYED FLAT ENDS AND SURFACES 99

3.17 FLAT TUBEPLATES 104

3.18 OPENINGS AND REINFORCEMENTS 106

3.19 CONNECTIONS AND BRANCHES 115

3.20 INSPECTION OPENINGS 130

3.21 BOLTED FLANGED CONNECTIONS 133

3.22 PIPES AND TUBES 174

3.23 JACKETED CONSTRUCTION 174

3.24 VESSEL SUPPORTS ........................1823.25 ATTACHED STRUCTURES AND EQUIPMENT 184

3.26 DESIGN OF TRANSPORTABLE VESSELS 186

3.27 QUICK-ACTUATING CLOSURES 187$E! AMP4DMtNT

SEbTION 4. CONSTRUCTION

4.1 CONSTRUCTION-GENERAL 189

4.2 WELDED CONSTRUCTION 195

4.3 CLAD AND LINED CONSTRUCTION 211

4.4 RIVETED CONSTRUCTION 211

4.5 BRAZED CONSTRUCTION 211

4.6 FORGED CONSTRUCTION 2124,7 CAST CONSTRUCTION 214

SECTION 5. TESTING AND QUALIFICATION

5.1 TESTING AND QUALIFICATION-GENERAL 2155.2 WELDED PRODUCTION TEST PLATES ................2155.3 NON-DESTRUCTIVE EXAMINATION ................2245.4 VISUAL EXAMINATION AND DIMENSIONAL CHECKS 233

5.5 RADIOGRAPHIC EXAMINATION OF WELDED JOINTS 2335.6 ULTRASONIC EXAMINATION OF WELDED JOINTS 2365.7 MAGNETIC PARTICLE EXAMINATION 2365.8 PENETRANT EXAMINATION ....................2375.9 NON-DESTRUCTIVE EXAMINATION OF CASTINGS 2375.10 HYDROSTATIC TESTS 2375.11 PNEUMATIC TESTS 2395.12 PROOF HYDROSTATIC TESTS 2405.13 LEAK TEST 2435.14 QUALIFICATION OF WELDING PROCEDURE 2435.15 SPECIFIC QUALIFICATION OF WELDERS 2485.16 QUALIFICATION OF BRAZING PROCEDURES, BRAZERS,

AND BRAZING OPERATORS ........................2505.17 SPECIAL TESTS ................................2505.18 HEAT TREATMENT vERIFICATr0N TESTS ............250

SECTION 6. INSPECTION

6.1 RESPONSIBILITIES AND QUALIFICATIONS 2526.2 INSPECTION OF DESIGN 2526.3 FACILITIES FOR INSPECTION 2526.4 MATERIAL INSPECTION 2526.5 GENERAL INSPECTION OF CONSTRUCTION 2526.6 INSPECTION OF WELDED CONSTRUCTION 2536.7 INSPECTION OF RIVETED CONSTRUCTION 2536.8 INSPECTION OF FORGED CONSTRUCTION 2536.9 INSPECTION OF CAST CONSTRUCTION 253

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AMDTNo. 3DEC.1993

Page 6 Contents

1 Appendix J, delete 'RECOMMENDED'.

2 Add the following after 'P':

Q ALTERNATIVE METHOD OF DESIGN FOR EXTERNAL PRESSURE .. 294

AMDT Page 6 ContentsNo 1NOV Delete 'Q RECOMMENDED MAXIMUM SERVICE TEMPERATURES'.I 990

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AS 1210-1989 6

Page

SECTION 7. MARKING AND REPORTS7.1 MARKING REQUIRED .... 2547.2 METHODS OF MARKING 2547.3 LOCATION OF MARKING 2547.4 SIZE AND TYPE OF MARKING 2547.5 MULTI-CHAMBER VESSELS 2547.6 WITNESSING OF MARKING 2547.7 REPORTS 254

SECTION 8. PROTECTIVE DEVICES AND OTHER FITTINGS8.1 GENERAL REQUIREMENTS ................2558.2 VESSELS REQUIRING PRESSURE-RELIEF DEVICES 2558.3 TYPES OF PRESSURE RELIEF-DEVICES 2568.4 PRESSURE-RELIEF VALVES ................2568.5 BURSTING DISCS ................................2578.6 REQUIRED DISCHARGE CAPACITY OF PRESSURE-RELIEF

2578.7 PRESSURE SETTING OF PRESSURE-RELIEF DEVICES 2598.8 INSTALLATION OF PRESSURE-RELIEF DEVICES 2598.9 DISCHARGE FROM PRESSURE-RELIEF DEVICES 2608.10 VACUUM-RELIEF DEVICES 2618.11 FUSIBLE PLUGS 2618.12 PROTECTION AGAINST EXCESSIVE TEMPERATURE 2618.13 PRESSURE GAUGES 2618.14 LIQUID LEVEL INDICATORS 2628.15 ISOLATION FITTINGS 2628.16 DRAINAGE 2628.17 VENTS 2628.18 PROTECTION OF VALVES AND FITTINGS 262

SECTION 9. PROVISIONS FOR DESPATCH9.1 CLEANING 2639.2 PROTECTION 2639.3 ASSOCIATED FITTINGS AND COMPONENTS 263

APPENDICESA BASIS OF DESIGN TENSILE STRENGTH 264B POROSITY CHARTS ................................267C RECOMMENDED PRACTICE TO AVOID FATIGUE CRACKING 272D RECOMMENDED CORROSION PREVENTION PRACTICE 273E INFORMATION TO BE SUPPLIED BY PURCHASER TO THE

MANUFACTURER ................................275F INFORMATION TO BE SUPPLIED BY MANUFACTURER 277G RECOMMENDED DATA SHEET ON WELDING PROCEDURE 281

H REQUIREMENTS FOR HIGHER STRESS VESSELS ........282SU A1 'IT' J INSTALLATION OF VESSELS 283

K LOW TEMPERATURE VESSELS ....................285L SUGGESTED PRACTICE ON PEENING OF WELDS ........291M DESCALING OF AUSTENITIC AND FERRITIC-AUSTENITIC

Cr-Ni STEEL VESSELS ............................292N MACRO-ETCHING OF WELDED JOINTS ................292P BASIS OF GROUPING OF STEELS FOR POSTWELD HEATTREATM .....................................293if AMEN ENtE A SERVICE TEMPERATURES 294R LIST OF REFERENCED DOCUMENTS ................297

INDEX 300

TECHNICAL CHANGES .... 309

RECORD OF AMENDMENTS 310

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