1、BRITISH STANDARD AEROSPACE SERIES BS EN 2257:1997 Circular tubes for structures in aluminium and aluminium alloys Diameter 6 mm k D k 100mm Thickness 1 mm k a k 6mm Dimensions The European Standard EN 2257:1997 has the status of a British Standard ICS 49.040.20BSEN2257:1997 This British Standard, ha
2、ving been prepared under the directionof the Engineering SectorBoard, was published underthe authority of the Standards Board and comes intoeffect on 15 June 1997 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference ACE/61 Draft for comment 95/702854 DC I
3、SBN 0 580 26686 9 Committees responsible for this BritishStandard The preparation of this British Standard was entrusted to Technical Committee ACE/61, Inspection and testing requirements for aerospace metallic materials, upon which the following bodies were represented: Aluminium Federation British
4、 Investment Casting Trade Association Copper Development Association Light Metal Founders Association Ministry of Defence National Physical Laboratory Society of British Aerospace Companies Limited UK Steel Association Amendments issued since publication Amd. No. Date CommentsBSEN2257:1997 BSI 12-19
5、99 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 0 Introduction 3 1 Scope 3 2 Normative references 3 3 Form 3 4 Recommended dimensions and mass 4 5 Tolerances 4 Figure 1 3 Table 1 4 Table 2 4 Table 3 5 Table 4 5 Table 5 5BSEN2257:1997 ii BSI 12-1999 Nation
6、al foreword This British Standard has been prepared by Technical Committee ACE/61 and is the English language version of EN2257:1997 Aerospace series Circular tubesfor structures in aluminium and aluminium alloys Diameter 6 mm k Dk 100 mm Thickness 1 mm k a k 6 mm Dimensions, published by the Europe
7、an Committee for Standardization (CEN). EN 2257:1997 was produced as a result of international discussions in which the United Kingdom took an active part. Cross-references The British Standards corresponding to the European Standards referred to in the text are identical in number and title with th
8、ose given in clause2. 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 Standard does not of itself confer immunity from legal obligations. Summary of pages Th
9、is document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 5 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN
10、STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2257 January 1997 ICS 49.040.10 Descriptors: Aircraft industry, structure, pipe, tube, aluminium, aluminium alloys, dimension English version Aerospace series Circular tubes for structures in aluminium and aluminium alloys Diameter 6 mm k D k 100 mm Thickn
11、ess 1 mm k a k 6 mm Dimensions Srie arospatiale Tubes circulaires pour structures en aluminium et alliages daluminium Diamtres 6 mm u D u 100 mm Epaisseurs 1 mm u a u 6 mm Dimensions Luft- und Raumfahrt Runde Konstruktionsrohre aus Aluminium und Aluminiumlegierungen Durchmesser 6 mm u D u 100 mm Wan
12、ddicken 1 mm u a u 6 mm Mae This European Standard was approved by CEN on 1996-08-04. 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
13、and bibliographical references concerning such national standards may be obtained on application to the Central 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 responsib
14、ility 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, Luxembourg, Netherlands, Norway, Po
15、rtugal, 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 1997 Copyright reserved to CEN members Ref. No. EN 2257:1997 EEN2257:1997 BSI 12-19
16、99 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Service
17、s of the member countries of AECMA prior to its presentation to CEN. 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 July1997, and conflicting national standards shall be withdrawn at the latest b
18、y July1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portuga
19、l, Spain, Sweden, Switzerland and the United Kingdom.EN2257:1997 BSI 12-1999 3 0 Introduction This standard is part of the series of EN metallic material standards for aerospace applications. The general organization of this series is described in EN4258. 1 Scope This standard specifies the dimensio
20、ns and tolerances of circular tubes for structures in aluminium and aluminium alloys, diameter6mmk D k 100mm, thickness1mm k a k6mm, for aerospace applications. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normativ
21、e 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 apply to this European Standard only when incorporated in it by amendment or revision. For undated referenc
22、es the latest edition of the publication referred to applies. EN 3848, Aerospace series Semi-finished products Method of measuring form deviations 1) . EN 4258, Aerospace series Metallic materials General organization of standardization Links between types of EN standards and their use 1) . 3 Form S
23、eeFigure 1. 1) Published as AECMA Prestandard at the date of publication of this standard Figure 1 EN2257:1997 4 BSI 12-1999 4 Recommended dimensions and mass 4.1 Diameter, thickness and mass See Table 1. Table 1 4.2 Length The order shall specify that circular tubes may be supplied in fixed or in r
24、andom lengths. In the event of a supply of random length the minimum and maximum values for the lengths shall be specified on the order. 5 Tolerances 5.1 Dimensional tolerances 5.1.1 Diameter SeeTable 2. Table 2 D Nominal Linear mass ain kg/m for a nominal in mm: mm 1 1,2 1,6 2 2,5 3,2 4 5 6 6 0,044
25、 8 0,062 10 0,080 0,093 0,12 12 0,097 0,11 0,15 14 0,11 0,14 0,17 16 0,13 0,16 0,20 0,25 18 0,15 0,18 0,23 0,28 20 0,17 0,22 0,26 0,32 25 0,21 0,25 0,33 0,40 32 0,27 0,33 0,43 0,53 40 0,34 0,41 0,54 0,67 0,80 50 0,43 0,51 0,68 0,84 1,00 63 0,86 1,10 1,30 1,70 2,10 2,50 80 1,10 1,40 1,70 2,20 2,70 3,
26、30 90 1,90 2,40 3,00 3,70 100 2,20 2,70 3,40 4,20 5,20 a For information, calculated with a density of 2,8 kg/dm 3 Dimensions in millimetres Diameter Tolerances 6 k D k 10 0,08 10 D k 18 0,10 18 D k 25 0,12 25 D k 50 0,15 50 D k 90 0,20 90 D k 100 0,25EN2257:1997 BSI 12-1999 5 5.1.2 Thickness See Ta
27、ble 3. Table 3 5.1.3 Length See Table 4; only applicable to tubes supplied in fixed lengths Table 4 5.2 Geometric tolerances Straightness 5.2.1 Method of measurement and symbols See EN 3848. 5.2.2 Tolerances See Table 5. Table 5 Thickness Tolerances mm % 1 k a k 1,2 10 1,2 1 000 +6 0 +10 0 Dimension
28、s in millimetres Diameter Straightness deviation Y 2on any length X 2 a 6 k D k 100 k 1,7 a X 2= 1 000BS EN 2257:1997 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on st
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