EN ISO 17781:2017
(Main)Petroleum, petrochemical and natural gas industries - Test methods for quality control of microstructure of ferritic/austenitic (duplex) stainless steels (ISO 17781:2017)
Petroleum, petrochemical and natural gas industries - Test methods for quality control of microstructure of ferritic/austenitic (duplex) stainless steels (ISO 17781:2017)
ISO 17781:2017 specifies quality control testing methods and test conditions for the characterization of microstructure in relation to relevant properties in ferritic/austenitic (duplex) stainless steel components supplied in the solution annealed condition and fabrication welds in the as welded condition.
ISO 17781:2017 supplements the relevant product and fabrication standards with respect to destructive testing methods including sampling of test specimens, test conditions and test acceptance criteria to show freedom from deleterious intermetallic phases and precipitates in duplex stainless steels. In addition, this document specifies the documentation of testing and test results by the testing laboratory.
NOTE 1 This document is based upon experience with duplex stainless steels in offshore oil and gas industry applications including topside and subsea hydrocarbon service, sea water service, as well as structural use.
NOTE 2 The austenite spacing is relevant to the susceptibility of duplex stainless steels to hydrogen-induced stress cracking (HISC) in subsea applications where cathodic protection is applied. This falls outside the scope of this document. Reference is made to DNV/GL RP-F112[4].
Erdöl-, petrochemische und Erdgasindustrie - Prüfverfahren für die Qualitätslenkung von Mikrostrukturen von ferritisch/austenitisch nichtrostenden Duplexstählen (ISO 17781:2017)
Industries du pétrole, de la pétrochimie et du gaz naturel - Méthodes d'essai pour le contrôle de la qualité de la microstructure des aciers inoxydables austénitiques/ferritiques (duplex) (ISO 17781:2017)
ISO 17781:2017 spécifie les méthodes et les conditions d'essai de contrôle de la qualité pour caractériser la microstructure par rapport aux propriétés pertinentes des composants en acier inoxydable ferritique/austénitique (duplex) fournis à l'état recuit et les soudures de fabrication à l'état brut de soudage.
ISO 17781:2017 complète les normes de fabrication du produit concerné par rapport aux méthodes d'essais destructifs, y compris le prélèvement des éprouvettes, les conditions d'essai et les critères d'acceptation des essais, pour démontrer l'absence de phases intermétalliques préjudiciables et de précipités dans les aciers inoxydables duplex. De plus, le présent document précise la documentation des essais et des résultats des essais par le laboratoire d'essai.
NOTE 1 Le présent document se fonde sur l'expérience acquise avec des aciers inoxydables duplex dans des applications de plates-formes d'extraction en mer de pétrole et de gaz, y compris dans le cadre d'un fonctionnement en milieu hydrocarbure sous-marin ou en surface ou en service dans l'eau de mer ou pour une utilisation structurelle.
NOTE 2 L'espacement austénitique est pertinent pour la sensibilité des aciers inoxydables duplex à la fissuration par contrainte induite par l'hydrogène (HISC) dans les applications sous-marines en présence d'une protection cathodique. Cela ne relève pas du domaine d'application du présent document. Cela relève du domaine d'application du DNV/GL RP-F112[4].
Petrokemična industrija ter industrija za predelavo nafte in zemeljskega plina - Preskusne metode za kontrolo kakovosti mikrostrukture avstenitno-feritnega (dupleksnega) nerjavnega jekla (ISO 17781:2017)
Ta dokument določa preskusne metode za kontrolo kakovosti in preskusne pogoje za karakterizacijo mikrostrukture glede na ustrezne lastnosti komponent iz avstenitno-feritnega (dupleksnega) nerjavnega jekla, ki so dobavljene v žarjenem stanju, in proizvodnih zvarov v varjenem stanju.
Ta dokument dopolnjuje ustrezne standarde proizvodov in izdelave v zvezi s porušitvenimi preskusnimi metodami, vključno z vzorčenjem, preskusnimi pogoji in merili sprejemljivosti preskusa, za dokazovanje neprisotnosti zdravju škodljivih intermetalnih faz in izločkov v dupleksnih nerjavnih jeklih. Dokument poleg tega določa dokumentacijo za preskušanje in rezultate preskusa iz laboratorija za preskušanje.
OPOMBA 1: Ta dokument temelji na izkušnjah z dupleksnimi nerjavnimi jekli, ki se uporabljajo v industriji za predelavo nafte in zemeljskega plina, med drugim v sistemih za rokovanje z ogljikovodiki, sistemih za rokovanje z morsko vodo in uporabo v strukturah na palubi in pod morsko gladino.
OPOMBA 2: Avstenitni razmak je pomemben za določanje občutljivosti dupleksnega nerjavnega jekla na inducirano vodikovo napetostno pokanje (HISC) pri uporabi pod vodo, kjer se uporablja katodna zaščita. Slednje ne spada na področje uporabe tega dokumenta. Dokument se sklicuje na dokument DNV/GL RP-F112[4].
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2017
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3UHVNXVQHPHWRGH]DNRQWURORNDNRYRVWLPLNURVWUXNWXUHDYVWHQLWQRIHULWQHJD
GXSOHNVQHJD QHUMDYQHJDMHNOD ,62
Petroleum, petrochemical and natural gas industries - Test methods for quality control of
microstructure of austenitic/ferritic (duplex) stainless steel (ISO 17781:2017)
Erdöl-, petrochemische und Erdgasindustrie - Werkstofftestanforderungen für
nichtrostenden Duplexstahl (ISO 17781:2017)
Industries du pétrole, de la pétrochimie et du gaz naturel - Méthodes d'essai de contrôle
de la qualité de la microstructure des aciers inoxydables (duplex)
austénitiques/ferritiques (ISO 17781:2017)
Ta slovenski standard je istoveten z: EN ISO 17781:2017
ICS:
75.180.01 Oprema za industrijo nafte in Equipment for petroleum and
zemeljskega plina na splošno natural gas industries in
general
77.140.20 Visokokakovostna jekla Stainless steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN ISO 17781
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2017
EUROPÄISCHE NORM
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 pétrole, de la pétrochimie et du gaz Erdöl-, petrochemische und Erdgasindustrie -
naturel - Méthodes d'essai de contrôle de la qualité de Prüfverfahren für die Qualitätslenkung von
la microstructure des aciers inoxydables (duplex) Microstrukturen von austenitisch/ferritisch
austénitiques/ferritiques (ISO 17781:2017) nichtrostendem Duplexstahl (ISO 17781:2017)
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 bibliographical 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 of 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 Macedonia, 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
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR 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 Ref. No. EN ISO 17781:2017 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
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
petroleum, 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 withdrawn 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 national 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, Lithuania, 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.
INTERNATIONAL ISO
STANDARD 17781
First edition
2017-07
Petroleum, petrochemical and
natural gas industries — Test
methods for quality control of
microstructure of ferritic/austenitic
(duplex) stainless steels
Industries du pétrole, de la pétrochimie et du gaz naturel — Méthodes
d’essai de contrôle de la qualité de la microstructure des aciers
inoxydables (duplex) austénitiques/ferritiques
Reference number
ISO 17781:2017(E)
©
ISO 2017
ISO 17781:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
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ii © ISO 2017 – All rights reserved
ISO 17781:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 2
3.1 Terms and definitions . 2
3.2 Abbreviated terms . 3
4 Sampling of test specimens . 4
4.1 General . 4
4.2 Casting test blocks. 6
4.3 Welds in the as welded condition . 6
5 Test methods . 7
5.1 General . 7
5.2 Microstructural examination . 7
5.2.1 General. 7
5.2.2 Preparation of specimen . 7
5.2.3 Etching of specimens . . 7
5.2.4 Microstructural evaluation of test specimens . 8
5.3 Ferrite content measurement .10
5.3.1 Test standard and conditions .10
5.3.2 Acceptance criteria .11
5.3.3 Reporting .11
5.4 Charpy V-notch impact toughness test .11
5.4.1 Test standard and conditions .11
5.4.2 Acceptance criteria .11
5.4.3 Reporting .12
5.5 Corrosion test .12
5.5.1 Test standard and conditions .12
5.5.2 Preparation of test specimens .13
5.5.3 Acceptance criteria .13
5.5.4 Reporting .13
Annex A (informative) Chemical compositions of duplex stainless steels .14
Annex B (informative) Preparation and etching for microstructural examination .16
Bibliography .18
ISO 17781:2017(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
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electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, 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
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Attention is drawn to the possibility that 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 declarations 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.
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