《BS-EN-10274-1999.pdf》由会员分享，可在线阅读，更多相关《BS-EN-10274-1999.pdf（12页珍藏版）》请在三一文库上搜索。
1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 10274:1999 The Euro
2、pean Standard EN 10274:1999 has the status of a British Standard ICS 77.040.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Metallic materials Drop weight tear test Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 07:01:24 GMT+00:00 2007
3、, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 September 1999 BSI 09-1999 ISBN 0 580 32638 1 BS EN 10274:1999 Amendments issued
4、since publication Amd. No.DateComments National foreword This British Standard is the English language version of EN 10274:1999. The UK participation in its preparation was entrusted by Technical Committee ISE/NFE/4, Mechanical testing of metals, to Subcommittee ISE/NFE/4/2, Ductility tests, which h
5、as the responsibility to: aid enquirers to understand the text; present to the responsible European committee 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. A lis
6、t of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled Internati
7、onal Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British
8、 Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover. The BSI copyright notice displayed throughout this document indicates when the d
9、ocument was last issued. Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 07:01:24 GMT+00:00 2007, Uncontrolled Copy, (c) BSI CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue
10、de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 10274:1999 E EUROPEAN STANDARDEN 10274 NORME EUROPE ENNE EUROPA ISCHE NORM May 1999 ICS 77.040.10 English version Metallic materials Drop weight t
11、ear test Mate riaux me talliques Essai de chute de masseMetallische Werkstoffe Fallgewichtsversuch This European Standard was approved by CEN on 16 April 1999. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard t
12、he 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 Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, Germa
13、n). A version in any other language made by translation 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, Czech Republic, Denmark, Fin
14、land, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 07:01:24 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Page 2 EN 10274:
15、1999 BSI 09-1999 Foreword This European Standard has been prepared 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 tex
16、t or by endorsement, at the latest by November1999, and conflicting national standards shall be withdrawn at the latest by November 1999. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This European Standard i
17、s considered to be a supporting standard to those application and product standards which in themselves support an essential safety requirement of a New Approach Directive and which make reference to this European Standard. According to the CEN/CENELEC Internal Regulations, the national standards or
18、ganizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Fore
19、word2 1Scope3 2Definitions3 3Symbols and abbreviations3 4Principle3 5Apparatus5 6Test piece preparation5 7Test procedure6 8Test evaluation6 9Test report7 Annex A (informative) Alternative procedure for testing thick material8 Annex B (informative) Method for calculating the percentage shear area for
20、 ferritic materials8 Annex C (informative) Bibliography8 Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 07:01:24 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Page 3 EN 10274:1999 BSI 09-1999 1 Scope This European Standard specifies the drop weight tear test for m
21、etallic materials and includes a method for assessing the fracture appearance of ferritic steels. Assessment can also be based on the energy absorbed in fracturing the test piece, particularly for materials other than ferritic steels. NOTE 1 This test method is based on the use of a falling weight o
22、r pendulum, however other types of machine, e.g. with hydraulic actuators, may be used provided that the requirements of this European Standard are satisfied. NOTE 2 The test is most commonly applied to ferritic steel tubes and to ferritic steel plate for the manufacture of tubes. 2 Definitions For
23、the purposes of this European Standard, the following definitions apply. 2.1 shear area the area of the fractured surface of the test piece that has broken in a ductile manner NOTEIt is normally identified by a grey silk-like appearance. 2.2 cleavage area the area of the fractured surface of the tes
24、t piece that has broken in a brittle manner NOTEIt is normally identified by a shiny crystalline appearance. 2.3 anvil that part of the testing machine used to support the test piece during impact 2.4 striker part of the hammer which is in contact with the test piece NOTEThis definition is identical
25、 to that given in EN 10045-2:1992, 3.5. 2.5 hammer the part of the test machine which impacts the test piece 2.6 fracture appearance transition temperature (FATT) the temperature required to cause a specified percentage of the fracture to occur by shear. Expressed as follows e.g. for 85 % specified
26、percentage of shear fracture at 230 8C, FATT (85) = 230 8C. 2.7 ferritic steel steel in which the ferritic state is stable at all service temperatures 3 Symbols and abbreviations 3.1 Symbols and designations adepth of pressed notch Llength of test piece Lcminimum length of unflattened central portio
27、n of test piece Rhradius of curvature of hammer Rnroot radius of pressed notch Rsradius of curvature of anvil support Sspan between anvils Tthickness of test piece Wwidth of test piece uangle of pressed notch 3.2 Abbreviations DWTTdrop weight tear test FATTfracture appearance transition temperature
28、(see 2.6) KVCharpy V-notch energy 4 Principle The test is generally carried out on test pieces taken from plate for the manufacture of tubes or from tube with an outside diameter greater than 300 mm and a thickness greater than 6 mm. The test involves fracturing a test piece containing a pressed not
29、ch by supporting it near its ends, and impacting it behind the notch (see Figure 1). The test is carried out at a specified test piece temperature. The test is as follows: a) to measure the relative proportions of shear and cleavage fracture, which are generally assessed visually, and to derive from
30、 these either: 1) the temperature at which a specified percentage of shear fracture has occurred (FATT); or 2) the amount of shear area produced by testing at a specified temperature; and/or b) to measure absorbed energy at the specified temperature. Licensed Copy: London South Bank University, Lond
31、on South Bank University, Thu Mar 01 07:01:24 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BSI 09-1999 Page 4 EN 10274:1999 Figure 1 Test piece geometry and recommended flattened tube profile Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 07:01:24 GMT+00:00 2007,
32、 Uncontrolled Copy, (c) BSI Page 5 EN 10274:1999 BSI 09-1999 5 Apparatus 5.1 The testing machine may be a falling weight type or a pendulum type. Other types of testing machine, e.g. with hydraulic actuators, may be used providing it can be demonstrated that their impact velocity and dynamic perform
33、ance conform to the requirements of 5.2. 5.2 The energy available at impact to be used in the test shall be greater than the anticipated fracture absorption energy of the test piece (see note). At impact the hammer velocity shall be not less than 5 m/s and not more than 10 m/s. NOTETo ensure regular
34、 crack propagation an available energy of 1,5 times the absorbed energy is generally sufficient 1. If the absorbed energy is not measured, the minimum required impact energy (EREQ) can be estimated from the Charpy V-notch energy (KV) adjusted for test piece cross-sectional fracture area using the fo
35、llowing expression EREQ= 5.6 (KV) 3 ADWTT AKV where ADWTTis the drop weight tear test fracture area; AKVis the Charpy test fracture area. 5.3 The striking edge of the hammer shall be radiused and shall be centred on the anvil with the supports at a span of 254 mm as shown in Figure 1. Provision shal
36、l be made to prevent out of plane rotation of the test piece on or after impact. The tolerances on the machine and set up dimensions shall be in accordance with Table 1. Table 1 Test machine dimensions and tolerances MeasurementDimensionTolerance mmmm S254,0 1,5 Rs15,0 1,0 Rh25,0 1,0 Centre line ham
37、mer with respect to mid-point between anvil supports0 1,5 5.4 A temperature controlled environment shall be provided in which the test piece can be soaked in a suitable medium for temperature conditioning before testing. Provision shall be made for circulation of the medium to ensure a uniform soaki
38、ng temperature. NOTEA procedure should be developed for test temperatures above or below room temperature to ensure that the temperature variation between the exit from the temperature conditioning medium and the execution of the test are within specified limits. 6 Test piece preparation 6.1 Test pi
39、ece location Test piece location and orientation within the tube or plate shall be as specified in the product standard. 6.2 Test piece 6.2.1 Unless otherwise specified in the product standard the test piece may be flattened completely for testing purposes or the central 50 mm may be left with the o
40、riginal pipe curvature. In the latter case the mid thickness at the centre of the test piece shall be in the same plane as the mid thickness at the anvil supports (see Figure 1). In the case of dispute the results of tests on test pieces with the central area unflattened shall apply. NOTEFlattening
41、the fracture area of the test piece may give more conservative results than those obtained from an unflattened test piece. 6.2.2 The test piece thickness shall be the full tube or plate thickness up to and including 19 mm. For thicknesses greater than 19 mm the test piece thickness may be either the
42、 full tube or plate thickness or it may be reduced to 19 mm. An alternative procedure for testing thicker materials, reduced in thickness to 19 mm, is given in annex A. If the test piece thickness is reduced to 19 mm it shall be agreed and documented at the time of enquiry and order. 6.2.3 Test piec
43、es may be prepared from an oversize flame-cut sample, however, final preparation shall be by a cold machining process (e.g. planing, sawing, or milling) to remove any heat affected zones. Test piece dimensions and tolerances shall be in accordance with Table 2. Table 2 Test piece dimensions and tole
44、rances MeasurementDimensionTolerance mmmm L305,0 20,0 W76,0 1,5 a5,0 0,5 u458 28 Rn0,01 to 0,04 Centre line notch with respect to centre line of hammer0 1,5 Lc50,0 6.2.4 The notch shall be pressed to the depth given in Table 2 with a chisel of minimum hardness 45 HRC, and shall have a radius of 0,02
45、 mm0,01 mm. Machined notches are prohibited. Licensed Copy: London South Bank University, London South Bank University, Thu Mar 01 07:01:24 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Page 6 EN 10274:1999 BSI 09-1999 Figure 2 Fracture surface included in percentage shear area determination 7 Test pro
46、cedure 7.1 The test piece shall be soaked in a suitable medium which is at a temperature within the following limits: a) for test temperatures below room temperature: +1,0 8C and 210,0 8C of the specified test temperature; b) for test temperatures above room temperature: 21,0 8C and +10,0 8C of the
47、specified test temperature. Test pieces shall be separated from each other and from the sides and bottom of the bath by a distance of at least the test piece thickness. When the surface of the test piece has reached the required temperature it shall remain in the medium at that temperature for the g
48、reater of the following times (see note). 1) For liquid medium: 15 min or 30 s per mm thickness. 2) For a gaseous medium: 30 min or 1 min per mm thickness. NOTEIf evidence can be produced to show that the test piece equilibrium temperature can be developed in a shorter time then these holding times
49、can be reduced. 7.2 The test piece shall be removed from the medium and broken on the test machine, by a single blow. The surface temperature of the test piece at the time of testing shall be within1,0 8C of the specified test temperature. This condition is considered to be met if the test is undertaken within 10 s of its removal from the soaking medium which is itself at a temperature within1 8C of the specified test temperature. If the test piece is out of the medium for longer than 10 s, it shall be returned to the bath until t