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1、CEN ENa30233 93 3404589 0063398 849 EUROPEAN STANDARD EN 10233 NORME EUROPENNE EUROPISCHE NORM October 1993 UDC 669.462 : 620.177 Descriptors: Metal tubes, mechanical tests, flattening tests, defects English version Metallic materials - Tube - Flattening test Matriaux mtalliques - Tubes - Essai dapl
2、atissement Metallische Werkstoffe - Rohr Ringfaltversuch This European Standard was approved by CEN on 1993-10-25. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any
3、alteration. Up-to-date lists and bibliographical references concerning such national standards 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 t
4、ranslation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxem
5、bourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1993 Copyright reserved to CEN members Ref. No. EN
6、10233 : 1993 E .CEN EN+L0233 93 m 3404589 00bLL 785 m Page 2 EN 10233 : 1993 Foreword This European Standard has been prepared by sub-committee ECISSTC 29, the secretariat of which has been allocated to the United Kingdom (BSI) . No meeting of the sub-committee has been held but the following countr
7、ies voted positively by the PQ-procedure on the acceptability of the reference document as a European Standard: Belgium, Denmark, Finland, Germany, Greece, Italy, Netherlands, Norway, Spain, Sweden, Switzerland and the United Kingdom. France voted negatively. This European Standard shal be given the
8、 status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 1994, and conflicting national standards shall be withdrawn at the latest by April 1994. In accordance with the CENKENELEC Internai Regulations, following countries are bound to imple
9、ment this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Foreword Introduction 1 Scope 2 Normative references 3 Principle 4 Symbols, descriptio
10、ns and units 5 Testing equipment 6 Test piece 7 Procedure 8 Test report page 2 3 3 3 3 3 4 4 4 4 CEN EN*L0233 93 = 3404589 OObL200 227 M Page 3 EN 10233: 1993 Introduction This standard is based on IS0 8492 : 1986 Metallic materials - Tube - Flattening test which has been editorially changed in the
11、light of the comments received. The scope of the standard has been amended to include tubes having an outside diameter not greater than 600 mm. Figure b) has been replaced by one from DIN 50136 and minor changes have been made to clause 6 Test piece. The usage of symbols has been aligned with the re
12、quirements of IS0 3545-1 : 1989. 1 Scope This European Standard specifies a method for determining the ability of metallic tubes of circular cross-section to undergo plastic deformation by flattening. It may also be used to show up defects in the tubes. The standard is applicable to tubes having an
13、outside diameter not greater than 600 mm and a thickness not greater than 15 % of the outside diameter. The range of the outside diameter, or thickness, for which this European Standard is applicable could be more exactly specified in the relevant product standard. 2 Normative references This Europe
14、an Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications a
15、pply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. IS0 3545-1 : Steel tubes and fittings - Symbols 1989 for use in spectfications - Part 1: Tubes and tubular accessories with circula
16、r cross-section 3 Principle Flattening a test piece at the end of a tube or cut from a tube, in a direction perpendicular to the longitudinal axis of the tube until the distance between platens measured under load in the direction of flattening, reaches a value specified in the relevant product stan
17、dard (see figures la and lb). In the case of close flattening, the internal surfaces of the test piece shall be in contact over at least half of the internal width b of the flattened test piece (see figure lc). 4 Symbols, descriptions and units Symbols, descriptions and units for the flattening test
18、 are in accordance with IS0 3545-1 : 1989 and are given in figure 1 and table 1. cl Figure 1. Symbols for flattening test CEN ENx10233 93 Page 4 EN 10233 : 1993 Thble 1. Ssmbols, descriptions and units Symbol D T b L H - Description Outside diameter of the tube Wall thickness of the tube Inside widt
19、h of the flattened test piece Length of the test piece Distance between platens measured under load 5 Testing equipment 5.1 The machine used for the test shall be able to flatten the test piece to the prescribed distance H between two plane, parallel, rigid platens. 5.2 The width of the platens shal
20、l exceed the width of the test piece after flattening i.e. at least 1,6D, and the length of the platens shall extend over the whole length of the test piece. 6 Test piece 6.1 The length of a test piece shall be not less than 10 mm nor more than 100 mm. The edges of the test piece may be rounded by f
21、iling or chamfered by other methods. NOTE. Non-rounded or non-chamfered edges are permissible if the test result meets the test requirements. 6.2 When the test is carried out on the end of a full-length tube, the tube shall be cut at right angles to the axis of the tube to a depth of at least 80 % o
22、f the tube outside diameter. m 3404589 OObL201 l b 3 m 7 Procedure 7.1 in general, the test shall be carried out at ambient temperature within the limits of 10 OC to 35 OC. The test carried out under controlled conditions shall be made at a temperature of (23 f 5) OC. 7.2 Place the test piece betwee
23、n two platens. 7.3 Ensure that the weld of the welded tubes is in position as required by the relevant product standard. 7.4 Flatten the test piece by moving the platens in a direction perpendicular to the longitudinal axis of the tube (see clause 3 ) . 7.5 in case of dispute, the rate of movement o
24、f the platens shall not exceed 25 mm/min. 7.6 interpretation of the flattening test shall be carried out according to the requirements of the relevant product standard. When these requirements are not specified, absence of cracks visible without the use of magnifying aids shall be considered as evid
25、ence that the test piece passed the test. Slight premature failure at the edges shall not be considered cause for rejection. 8 Test report 8.1 A test report shall be provided when so specified in the relevant product standard. 8.2 The test report shall include at least the following information: a) reference to this European Standard; b) identification of the test piece; c) dimensions of the test piece; d) degree of flattening; e) position of the weld; f) result of the test.
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