1、DEUTSCHE NORM Julv 1999 Metallic materials English version of DIN EN 10274 Drop weight tear test DIN EN 10274 ICs 77.040.1 O Metallische Werkstoffe - Fallgewichtsversuch European Standard EN 10274 : 1999 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This
2、standard has been prepared by ECISS/TC 29. The responsible German body involved in its preparation was the Normenausschu Materialprfung (Mate- rials Testing Standards Committee), Technical Committee Prfungverfahren mit schlagartiger Bean- spruchung fr Metalle. EN comprises 11 pages. No pari of this
3、standard may be reproduced without the prior permission of V Deutsches Institut fur Normung e. V., Berlin. Luth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen). Ref. No. DIN EN 10274 : 1999-0 English price group 07 Sales No. 1107 12.99 EUROPEAN STANDARD
4、 NORME EUROPENNE EUROPISCHE NORM EN 10274 May 1999 ICs 77.040.1 O English version Metallic materials Drop weight tear test Matriaux mtalliques - Essai de chute de masse Fallgewichtsversuch Metallische Werkstoffe - This European Standard was approved by CEN on 1999-04-1 6. CEN members are bound to co
5、mply with the CENKENELEC 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 stand- ards may be obtained on application to the Central
6、Secretariat or to any CEN member. The European Standards exist 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 Central Secretariat has the same status as the o
7、fficial versions. CEN members are the national standards bodies of Austria, Belgium, the Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, the Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. CEN European Committee for S
8、tandardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 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 Page 2 EN 10274 : 1999 C
9、ontents Page Foreword 1 Scope 2 Definitions 3 Symbols and abbreviations 4 Principle 5 Apparatus 6 Test piece preparation 7 Test procedure 8 Test evaluation 9 Test report 2 3 3 4 4 6 7 7 8 10 Annex A (informative) Alternative procedure for testing thick material Annex C (informative) Bibliography 11
10、10 Annex B (informative) Method for calculating the percentage shear area for femtic materiais 11 Foreword This European Standard has been prepared by Technical Committee ECISSRC 29 “Steel tubes and fittings for steel tubes”, the secretariat of which is held by UNI. This European Standard shall be g
11、iven the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 1999, 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 Eur
12、opean Commission and the European Free Trade Association. This European Standard is 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 Stan
13、dard. According to the CENKENELEC Internal Regulations, the national standards organizations 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
14、, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Page 3 EN 10274 : 1999 1 Scope This European Standard specifies the drop weight tear test for metallic materials and includes a method for assessing the fracture appearance of ferritic steels. Assessment can also be based on the energy a
15、bsorbed in fracturing the test piece, particularly for materials other than femtic steels. NOTE 1 : This test method is based on the use of a falling weight or pendulum, however other types of machine, e.g. with hydraulic actuators, may be used provided that the requirements of this European Standar
16、d are satisfied. NOTE 2: The test is most commonly applied to femtic steel tubes and to ferritic steel plate for the manufacture of tubes. 2 Definitions For the purposes of this European Standard, the following definitions apply: 2.1 shear area: The area of the fractured surface of the test piece th
17、at has broken in a ductile manner. NOTE: It is normally identified by a grey silk-like appearance. 2.2 cleavage area: The area of the fractured surface of the test piece that has broken in a brittle manner. NOTE: It is normally identified by a shiny crystalline appearance. 2.3 anvil: That part of th
18、e 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. NOTE: This definition is identical to that given in 3.5 of EN 10045-2: 1992. 2.5 hammer: The part of the test machine which impacts the test piece. 2.6 fracture ap
19、pearance 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 percentage o shear fracture at -30 “C. FATT (85) = -30 “C. 2.7 ferritic steel: Steel in which the ferritic state is stable
20、at all service temperatures. Page 4 EN 10274 : 1999 3 Symbols and abbreviations 3.1 Symbols and designations a L L Rh R“ Rs S T W 0 3.2 Abbreviations DWTT FAIT KV depth of pressed notch length of test piece minimum length of unflattened central portion of test piece radius of curvature of hammer roo
21、t radius of pressed notch radius of curvature of anvil support span between anvils thickness of test piece width of test piece angle of pressed notch drop weight tear test fracture appearance transition temperature (see 2.6) charpy V-notch energy 4 Principle The test is generally carried out on test
22、 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 notch by supporting it near its ends, and impacting it behind the notch (see figure I). Pa
23、ge 5 EN 10274 : 1999 Li E m z - - L/ o a M or 2) the amount of shear area produced by testing at a specified temperature. b) To measure absorbed energy at the specified temperature. Page 6 EN 10274 : 1999 5 Apparatus 5.1 The testing machine may be a falling weight type or a pendulum type. Other type
24、s of testing machine, e.g. with hydraulic actuators, may be used providing it can be demonstrated that their impact velocity and dynamic performance conform to the requirements of clause 5.2. 5.2 The energy available at impact to be used in the test shall be greater than the anticipated fracture abs
25、orption 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 ds. NOTE: To ensure regular crack propagation an available energy of 1,5 times the absorbed energy is generally sufficient i. If the absorbed energy is not measured, the mini
26、mum required impact energy (E REQ) can be estimated from the Charpy V-notch energy (KV) adjusted for test piece cross sectional fracture area using the following expression A DWT A KV E EQ = 5.6 (KV) x - where ADWTT is the drop weight tear test fracture area AKV is the Charpy test fracture area 5.3
27、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 shall 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
28、in accordance with table 1. Table 1: Test machine dimensions and tolerances Measurement S R, Centre line hammer with respect to mid-point between anvil Rh Dimension Tolerance 254.0 k 1.5 k 1.0 25.0 i 1.0 5 1.5 supports 5.4 A temperature controlled environrneni shall be provided in which ihe test pie
29、ce 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 soaking temperature. NOTE: A procedure should be developed for test temperatures abob i9122 22 I29 mm 9 Test report Temperature reduction “C 5s
30、 1 l,o The test report shall include at least the following information: a) reference to this European Standard i.e. EN 10274; b) identification of the test piece; e.g. cast Nohube Nohdentification No; c) material specification if known; d) dimensions of the plate or tube; e) test piece thickness; f
31、) impact energy used in the test or the mass and height of drop of the hammer g) whether the test piece has been flattened; h) the percentage shear area and test temperature of each test piece when appropriate; i) the fracture appearance transition temperature corresponding to a specified percentage
32、 shear arca when j) fracture absorption energy when appropriate. appropriate; Annexes Annex A (informative) Alternative procedure for testing thick material When this procedure is adopted, it is necessary for test pieces with thicknesses greater than i9 mm to be reduced in thickness to 19 mm minimum
33、 by machining one or both surfaces. They should be tested and assessed as described in clauses 7 and 8. For femtic steels 5 40 mm thick the test temperature should be reduced by the amount given in table A.l. NOTE: For ferritic materials greater than 40 mm thick and for other materials the procedure
34、 to be used should be agreed between the purchaser and manufacturer at the time of enquiry and order. Table A.l: Reduction in test temperature Page 11 EN 10274 : 1999 Annex B (informative) Method for calculating the percentage shear area for ferritic materiais B.l The percentage shear area of the fr
35、acture surface should be determined by one of the following methods: - Measure the shear area of the fracture with a planimeter on photograph or optical projection of the fracture surface. - Compare the fracture surface with a set of reference specimens. The percent shear area of the reference speci
36、mens should have been evaluated with a planimeter; the thickness of the reference specimen should be identical to that of the evaluated specimen - Follow the procedure described in B.2; - Use any other procedure that can be shown to produce results equivalent to those obtained from one of the three
37、methods above. 3 mm. B.2 For shear areas between 45 % and 100 % of the fracture surface on tests piece thicknesses of 19 mm or less the percentage shear area may be calculated from the formula: (W-a-Zx)T-(3/4)AB x ZOO (W - a - 2x) T % shear area = where A is the width of the cleavage fracture at the
38、 “one T“ line beneath the notch (mm) B is the length of the cleavage fracture in between the “one T“ lines, (mm) T is the test piece thickness (mm) W is width of test piece (mrn) a is the depth of the preased notch (mm) X is the test piece thickness 19 mm). Annex C (informative) Bibliography 11 Fallgewichtversuch nach Battelle, Stahl-Eisen-Frfilatt 1326 : 1983
