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1、BRITISH STANDARD BS EN ISO 8495:2004 Metallic materials Tube Ring-expanding test The European Standard EN ISO 8495:2004 has the status of a British Standard ICS 77.040.10 ? BS EN 8495:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 24 No
2、vember 2004 BSI 24 November 2004 ISBN 0 580 44840 1 National foreword This British Standard is the official English language version of EN ISO 8495:2004. It is identical with ISO 8495:1998. It supersedes BS EN 10236:1994, which is withdrawn. The UK participation in its preparation was entrusted by T
3、echnical Committee ISE/NFE/4, Mechanical testing of metals, to Subcommittee ISE/NFE/4/2, Ductility testing, which has the responsibility to: A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement in
4、ternational or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not p
5、urport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European commi
6、ttee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN I
7、SO foreword page, the ISO title page, page ii, pages 1 to 3 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No.DateComments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8495 July 2
8、004 ICS 77.040.10Supersedes EN 10236:1993 English version Metallic materials - Tube - Ring-expanding test (ISO 8495:1998) Matriaux mtalliques - Tubes - Essai de dilatation danneaux (ISO 8495:1998) Metallische Werkstoffe - Rohr - Ringaufdornversuch (ISO 8495:1998) This European Standard was approved
9、by CEN on 1 July 2004. 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 standar
10、ds may be obtained on application to the Central Secretariat 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 th
11、e Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norw
12、ay, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CENAll rights of exploitation in any form and by a
13、ny means reserved worldwide for CEN national Members. Ref. No. EN ISO 8495:2004: E Foreword The text of ISO 8495:1998 has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 8495:
14、2004 by Technical Committee ECISS/TC 29 “Steel tubes and fittings for steel tubes“, the 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 January 2005, and confl
15、icting national standards shall be withdrawn at the latest by January 2005. This document supersedes EN 10236:1993. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cypr
16、us, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 8495:1998 has b
17、een approved by CEN as EN ISO 8495:2004 without any modifications. EN ISO 8495:2004 A Reference number ISO 8495:1998(E) INTERNATIONAL STANDARD ISO 8495 Second edition 1998-11-01 Metallic materials Tube Ring-expanding test Matriaux mtalliques Tubes Essai de dilatation danneaux EN ISO 8495:2004 ii For
18、eword 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 through ISO technical committees. Each member body interested in a subject for which a tech
19、nical committee has been established has the right to be represented on that committee. 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
20、 electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 8495 was pr
21、epared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 2, Ductility testing. This second edition cancels and replaces the first edition (ISO 8495:1986), of which it constitutes a technical revision. EN ISO 8495:2004 DRADNATS LANOITANRETNI OSI)E(8991:5948 OSI 1 Metall
22、ic materials Tube Ring-expanding test 1 Scope This 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
23、 to assess the ability of tubes 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 wall thickness from 2 mm up to and including 16 mm. 2 Symbols, designations and units Symbols, designations and units fo
24、r the ring-expanding test are given in table 1 and are shown in figure 1. Table 1 SymbolDesignationUnit aa Wall thickness of the tubemm DOriginal outside diameter of the tubemm Dmmax.Maximum diameter of the conical mandrelmm Dmmin.Minimum diameter of the conical mandrelmm Du Maximum outside diameter
25、 of the expanded part of the test piece mm kLength of the taper of the conical mandrelmm LLength of the test piece before the testmm a The symbol T is also used in steel tube standards. 3 Principle Expanding a ring cut from the end of a tube, over a conical mandrel until fracture, or until the expan
26、sion of the test piece reaches a value specified in the relevant product standard (see figure 1). EN ISO 8495:2004 2 Figure 1 4 Apparatus 4.1 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 otherwis
27、e specified in the relevant product standard and its surface shall be of sufficient hardness, well-polished and free from scores. 5 Test piece 5.1 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
28、 cut to 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 t
29、est result meets the test requirements. 5.3 When welded tubes are subjected to the test, the internal weld flash may be removed. 6 Procedure 6.1 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
30、be made at a temperature of 23 C 5 C. EN ISO 8495:2004 3 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 concentric (see figure 1). 6.3 Force
31、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 standard. 6.6 Interpretation of the ri
32、ng-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. 7 Test report A test report
33、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) reference to this International Standard, i.e. ISO 8495; b) identification of the test piece; c) dimensions of the test piece; d) degree of expansi
34、on; e) taper of the conical mandrel if different from that given in 4.2; f) result of the test. EN ISO 8495:2004 BS EN ISO 8495:2004 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It present
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