1、Petroleum, petrochemical and natural gas industries - Test methods for quality control of microstructure of ferritic/austenitic (duplex) stainless steelsBS EN ISO 17781:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE N
2、ORM EN ISO 17781 August 2017 ICS 75.180.01 English Version Petroleum, petrochemical and natural gas industries - Test methods for quality control of microstructure of ferritic/austenitic (duplex) stainless steels (ISO 17781:2017) Industries du ptrole, de la ptrochimie et du gaz naturel - Mthodes des
3、sai de contrle de la qualit de la microstructure des aciers inoxydables (duplex) austnitiques/ferritiques (ISO 17781:2017) Erdl-, petrochemische und Erdgasindustrie - Prfverfahren fr die Qualittslenkung von Microstrukturen von austenitisch/ferritisch nichtrostendem Duplexstahl (ISO 17781:2017) This
4、European Standard was approved by CEN on 1 July 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references c
5、oncerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member
6、 into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, Franc
7、e, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPIS
8、CHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 17781:2017 ENational forewordThis British Standard is the UK implementation of EN ISO
9、 17781:2017. It is identical to ISO 17781:2017.The UK participation in its preparation was entrusted to Technical Committee PSE/17, Materials and equipment for petroleum, petrochemical and natural gas industries.A list of organizations represented on this committee can be obtained on request to its
10、secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 88028 5ICS 75.180.01Compliance with a British Standard ca
11、nnot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 17781:2017EUROPEAN STANDARD NORME EUROPENN
12、E EUROPISCHE NORM EN ISO 17781 August 2017 ICS 75.180.01 English Version Petroleum, petrochemical and natural gas industries - Test methods for quality control of microstructure of ferritic/austenitic (duplex) stainless steels (ISO 17781:2017) Industries du ptrole, de la ptrochimie et du gaz naturel
13、 - Mthodes dessai de contrle de la qualit de la microstructure des aciers inoxydables (duplex) austnitiques/ferritiques (ISO 17781:2017) Erdl-, petrochemische und Erdgasindustrie - Prfverfahren fr die Qualittslenkung von Microstrukturen von austenitisch/ferritisch nichtrostendem Duplexstahl (ISO 177
14、81:2017) This European Standard was approved by CEN on 1 July 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographica
15、l references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility o
16、f a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Ma
17、cedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALI
18、SATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 17781:2017 EBS EN ISO 17781:2017EN ISO 17781:2017 (E) 2 European forewo
19、rd This document (EN ISO 17781:2017) has been prepared by Technical Committee ISO/TC 67 “Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries” in collaboration with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures for petrole
20、um, petrochemical and natural gas industries” the secretariat of which is held by NEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2018, and conflicting national standards shall be wi
21、thdrawn at the latest by February 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the nation
22、al standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithu
23、ania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 17781:2017 has been approved by CEN as EN ISO 17781:2017 without any modification. ISO 17781:2017(E)Forew
24、ord ivIntroduction v1 Scope . 12 Normative references 13 Terms, definitions and abbreviated terms 23.1 Terms and definitions . 23.2 Abbreviated terms . 34 Sampling of test specimens . 44.1 General . 44.2 Casting test blocks 64.3 Welds in the as welded condition . 65 Test methods . 75.1 General . 75.
25、2 Microstructural examination 75.2.1 General 75.2.2 Preparation of specimen . 75.2.3 Etching of specimens 75.2.4 Microstructural evaluation of test specimens 85.3 Ferrite content measurement . 105.3.1 Test standard and conditions . 105.3.2 Acceptance criteria .115.3.3 Reporting . 115.4 Charpy V-notc
26、h impact toughness test 115.4.1 Test standard and conditions . 115.4.2 Acceptance criteria .115.4.3 Reporting . 125.5 Corrosion test 125.5.1 Test standard and conditions . 125.5.2 Preparation of test specimens . 135.5.3 Acceptance criteria .135.5.4 Reporting . 13Annex A (informative) Chemical compos
27、itions of duplex stainless steels .14Annex B (informative) Preparation and etching for microstructural examination .16Bibliography .18 ISO 2017 All rights reserved iiiContents PageBS EN ISO 17781:2017ISO 17781:2017(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms, definitions an
28、d abbreviated terms 23.1 Terms and definitions . 23.2 Abbreviated terms . 34 Sampling of test specimens . 44.1 General . 44.2 Casting test blocks 64.3 Welds in the as welded condition . 65 Test methods . 75.1 General . 75.2 Microstructural examination 75.2.1 General 75.2.2 Preparation of specimen .
29、75.2.3 Etching of specimens 75.2.4 Microstructural evaluation of test specimens 85.3 Ferrite content measurement . 105.3.1 Test standard and conditions . 105.3.2 Acceptance criteria .115.3.3 Reporting . 115.4 Charpy V-notch impact toughness test 115.4.1 Test standard and conditions . 115.4.2 Accepta
30、nce criteria .115.4.3 Reporting . 125.5 Corrosion test 125.5.1 Test standard and conditions . 125.5.2 Preparation of test specimens . 135.5.3 Acceptance criteria .135.5.4 Reporting . 13Annex A (informative) Chemical compositions of duplex stainless steels .14Annex B (informative) Preparation and etc
31、hing for microstructural examination .16Bibliography .18 ISO 2017 All rights reserved iiiContents PageBS EN ISO 17781:2017ISO 17781:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparin
32、g International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liai
33、son with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Dire
34、ctives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that
35、 some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent dec
36、larations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformi
37、ty assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshor
38、e structures for petroleum, petrochemical and natural gas industries.iv ISO 2017 All rights reservedBS EN ISO 17781:2017ISO 17781:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing
39、International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaiso
40、n with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Direct
41、ives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that s
42、ome of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent decla
43、rations received (see www .iso .org/ patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity
44、 assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore
45、structures for petroleum, petrochemical and natural gas industries.iv ISO 2017 All rights reserved ISO 17781:2017(E)IntroductionThe aim of this document is to establish common test methods for quality control of microstructure of ferritic/austenitic (duplex) stainless steels for the oil and gas indu
46、stry, enabling the manufacturers to apply the same test procedures for their clients.Duplex stainless steels have a dual phase microstructure consisting of ferrite and austenite. Ideally, these phases are present in equal proportions; although in alloys which are commercially available, the ferrite
47、phase volume fraction can vary between 35 % and 65 % for products in the solution annealed condition. They are characterized by high-chromium (19 % to 33 %) and low-nickel contents compared with austenitic stainless steels.Duplex stainless steels are prone to precipitation of intermetallic phases, c
48、arbides and/or nitrides possibly causing embrittlement and reduced corrosion resistance. The formation of intermetallic phases such as Sigma, , and Chi, , occurs depending on exposure time in the approximate temperature range 590 C to 1 000 C (1 094 F to 1 832 F) and decomposition of ferrite to Alph
49、a Prime occurs in the range 300 C to 540 C (572 F to 1 004 F).The microstructure of components or fabrication welds is affected by amongst others the thermal-mechanical history associated with hot working, solution annealing and with subsequent forming and welding. The destructive test methods with acceptance criteria specified herein are considered relevant to verify that exposure time at above stated temperature ranges have been within acceptable limits and to ensure that desired corrosion resistance and mechanical properties
