1、BSI Standards PublicationBS EN ISO 8495:2013Metallic materials Tube Ring-expanding testBS EN ISO 8495:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 8495:2013.It supersedes BS EN ISO 8495:2004 which is withdrawn.The UK participation in its preparation
2、was entrusted to TechnicalCommittee ISE/101/2, Ductility testing.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication.
3、The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 82940 6ICS 77.040.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30
4、 November 2013.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8495 November 2013 ICS 77.040.10 Supersedes EN ISO 8495:2004English Version Metallic materials - Tube - Ring-expanding test (ISO 8495:2013) Matriaux mtalliques - Tubes - Essai
5、 de dilatation danneaux (ISO 8495:2013) Metallische Werkstoffe - Rohr - Ringaufdornversuch (ISO 8495:2013) This European Standard was approved by CEN on 28 October 2013. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
6、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 (En
7、glish, 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
8、, 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, Slovakia, Slovenia, Spain, Sweden, Switzerla
9、nd, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Me
10、mbers. Ref. No. EN ISO 8495:2013 EBS EN ISO 8495:2013EN ISO 8495:2013 (E) 3 Foreword This document (EN ISO 8495:2013) has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals“ in collaboration with Technical Committee ECISS/TC 110 “Steel tubes, and iron and steel fittings” t
11、he secretariat of which is held by UNI. 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 May 2014, and conflicting national standards shall be withdrawn at the latest by May 2014. Attention is draw
12、n to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 8495:2004. According to the CEN-CENELEC Internal Regulations, the natio
13、nal 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, Lith
14、uania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 8495:2013 has been approved by CEN as EN ISO 8495:2013 without any modification. BS EN ISO 8495:2013ISO 8495:201
15、3(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Symbols, designations and units 13 Principle 14 Apparatus . 25 Test piece 26 Procedure. 27 Test report . 3BS EN ISO 8495:2013ISO 8495:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide feder
16、ation of national standards bodies (ISO member bodies). The work of preparing 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 commit
17、tee. International organizations, governmental and non-governmental, in liaison 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
18、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 editorial rules of the ISO/IEC Directives, Part
19、2. www.iso.org/directivesAttention 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 docume
20、nt will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patentsAny trade name used in this document is information given for the convenience of users and does not constitute an endorsement.The committee responsible for this document is ISO/TC 164, Mechanica
21、l testing of metals, Subcommittee SC 2, Ductility testing.This third edition cancels and replaces the second edition (ISO 8495:1998), of which it constitutes a minor revision.iv ISO 2013 All rights reservedBS EN ISO 8495:2013INTERNATIONAL STANDARD ISO 8495:2013(E)Metallic materials Tube Ring-expandi
22、ng test1 ScopeThis International Standard specifies a method for a ring-expanding test on tubes, that is used to reveal defects both on the surfaces and within the tube wall by expanding the test piece using a conical mandrel until fracture occurs. It may be also used to assess the ability of tubes
23、to undergo plastic deformation.The ring-expanding test is applicable to tubes having an outside diameter from 18 mm up to and including 150 mm and a wall thickness from 2 mm up to and including 16 mm.2 Symbols, designations and unitsSymbols, designations and units for the ring-expanding test are giv
24、en in Table 1 and are shown in Figure 1.Table 1Symbol Designation Unita aDDmmax.Dmmin.DukLWall thickness of the tubeOriginal outside diameter of the tubeMaximum diameter of the conical mandrelMinimum diameter of the conical mandrelMaximum outside diameter of the expanded part of the test pieceLength
25、 of the taper of the conical mandrelLength of the test piece before the testmmmmmmmmmmmmmmaThe symbol T is also used in steel tube standards.3 PrincipleExpanding a ring cut from the end of a tube, over a conical mandrel until fracture, or until the expansion of the test piece reaches a value specifi
26、ed in the relevant product standard (see Figure 1). ISO 2013 All rights reserved 1BS EN ISO 8495:2013ISO 8495:2013(E)Figure 14 Apparatus4.1 Variable-speed press or universal testing machine.4.2 Conical mandrel, having a working length preferably tapered 1:5 as shown in Figure 1, unless otherwise spe
27、cified in the relevant product standard, and its surface shall be of sufficient hardness, well-polished and free from scores.5 Test piece5.1 The length of the test piece shall be between 10 mm and 16 mm. Test pieces shall be taken from the ends of deburred tubes as manufactured before they are cut t
28、o length. The rings shall be cut so that the planes of the end faces are parallel with each other and perpendicular to the axis of the tube.5.2 The edges of the test piece may be rounded by filing or chamfered by other methods.NOTE Non-rounded or non-chamfered edges are permissible, if the test resu
29、lt meets the test requirements.5.3 When welded tubes are subjected to the test, the internal weld flash may be removed.6 Procedure6.1 In general, the test shall be carried out at ambient temperature within the limits of 10 C to 35 C. The test carried out under controlled conditions shall be made at
30、a temperature of 23 C 5 C.2 ISO 2013 All rights reservedBS EN ISO 8495:2013ISO 8495:2013(E)6.2 Before testing, the rings and the conical mandrel may be lubricated. Rings of the same size and the same type of metal may be placed one on top of each other. The rings and the conical mandrel shall be con
31、centric (see Figure 1).6.3 Force the conical mandrel into the rings until the required expansion is reached or the rings fracture.6.4 The rate of penetration of the conical mandrel shall not exceed 30 mm/s.6.5 The relative expansion shall be calculated in accordance with the relevant product standar
32、d.6.6 Interpretation of the ring-expanding test shall be carried out in accordance with the requirements of the relevant product standard. When these requirements are not specified, the test piece shall be considered to have passed the test if no cracks are visible without the use of magnifying aids
33、.7 Test reportA test report shall be provided when so specified in the relevant product standard. In this case, the test report shall include at least the following information:a) a reference to this International Standard, i.e. ISO 8495;b) identification of the test piece;c) dimensions of the test
34、piece; d) relative expansion;e) taper of the conical mandrel if different from that given in 4.2;f) result of the test. ISO 2013 All rights reserved 3This page deliberately left blankThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other stand
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