1、BRITISH STANDARD AEROSPACE SERIES BS EN 2157-2:1993 Steel Forging stock and forgings Technical specifications Part 2: Forging stock The European Standard EN 2157-2:1993 has the status of a British StandardBSEN 2157-2:1993 This British Standard, having been prepared under the directionof the Aerospac
2、e Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15 December 1993 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference ACE/61 Draft for comment 90/80846 DC ISBN 0 580 22106 7 Cooperating organiza
3、tions The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardise
4、ringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale
5、 Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardiseringskommissionen i Sverige Sw
6、itzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN 2157-2:1993 BSI 07-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN 2157-2 3 National
7、annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN 2157-2:1993 ii BSI 07-1999 National foreword This British Standard has been prepared under the direction of the Aerospace Standards Policy Committee and is the Engli
8、sh lanugage version of EN2157-2:1993, Aerospace Series Steel Forging stock and forgings. Technical specifications Part 2: Forging stock, published by the European Committee for Standardization (CEN). EN2157-2 was produced as a result of international discussion in which the United Kingdom took an ac
9、tive part. 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 This document
10、 comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 4, an inside back cover 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 cove
11、r.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2157-2 August 1993 UDC 669.14-4:621.73:620.1:629.7 Descriptors: Aircraft industry, forgings, die forgings, steels, specifications, forging English version Aerospace series Steel Forging stock and forgings Technical specification Part 2 Forging s
12、tock Srie arospatiale Acier Produits destins la forge Pices forges et pices matrices Spcification technique Partie 2 Produits destins la forge Luft- und Raumfahrt Stahl Schmiedevormaterial und Schmiedestcke Technische Lieferbedingungen Teil 2 Schmiedevormaterial This European Standard was approved b
13、y CEN on 1993-08-19. 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 standards
14、 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 the
15、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, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN Europ
16、ean Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1993 Copyright reserved to CEN members Ref. No. EN 2157-2:1993 EEN 2157-2:1993 BSI 07-1999 2 Foreword This European Standard has been prepared by t
17、he European Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this draft standard has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prio
18、r to its presentation to CEN. This Standard was submitted for Formal Vote, and the result was positive. 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 February1994, and conflicting national stand
19、ards shall be withdrawn at the latest by February1994. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Port
20、ugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Manufacture 3 4 Dimensions and tolerances 3 5 Internal defects 3 6 External defects 4 7 Mechanical tests 4 8 Special tests 4 9 Marking 4 Table 1 Summary of requirements 4EN 2157-2:1993
21、BSI 07-1999 3 1 Scope The present standard specifies the particular requirements for forging stock intended for the manufacture of steel forgings. This standard shall be used in conjunction with EN2157-1. Bars and sections conforming to EN2069-3 may be used as forging stock provided that an agreemen
22、t was established between the forging stock manufacturer and the purchaser to ensure that the requirements of the present standard are met. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cit
23、ed 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 references the latest editio
24、n of the publication referred to applies. EN 2002-1, Aerospace series Test methods for metallic materials Part 1: Tensile testing at ambient temperature 1) . EN 2003-1, Aerospace series Test methods for steel products Part 1: Charpy impact test (U notch) 1) . EN 2003-2, Test methods for steel produc
25、ts Part 2: Izod impact test Aerospace series 2) . EN 2003-8, Aerospace series Test methods for products in steel, titanium, titanium alloys and heat resisting alloys Part 8: Ultrasonic inspection for semi-finished products (rolled, drawn, extruded, forged) 3) . EN 2069-3, Inspection and testing requ
26、irements for steel wrought products Part 3: Inspection and testing requirements for bars and sections Aerospace series 2) . EN 2157-1, Aerospace series Steel Forging stock and forgings Technical specification Part1: General requirements. EN 2951, Aerospace series Test methods for steels Microscopic
27、examination for assessing the content of non metallic inclusions 3) . 3 Manufacture Unless otherwise specified on the material standard, order or inspection schedule, the method of manufacture to be employed shall be at the discretion of the manufacturer. All forging stock shall be mechanically work
28、ed with a minimum reduction of4 : 1 (ratio between cross-section) unless otherwise agreed between the manufacturer and the purchaser. 4 Dimensions and tolerances The dimensions and tolerances shall be defined by agreement between the manufacturer and the purchaser. The frequency of examination adopt
29、ed by the manufacturer shall be sufficient to permit him to certify compliance with the requirements. 5 Internal defects Prior to final inspection, an adequate length shall be cut from the forging stock ends and metal removed from the surface. The manufacturer shall establish an appropriate techniqu
30、e for verifying that adequate material has been removed. The technique used shall be recorded in the manufacturers internal documentation. 5.1 Ultrasonic testing Unless otherwise specified by the material standard, order or inspection schedule, all forging stock shall be ultrasonically tested in acc
31、ordance with EN2003-8. Acceptance criteria: forging stock k 250mmdiameter : class2ofEN2003-8; forging stock 250mmdiameter : to be agreed between the manufacturer and the purchaser. 5.2 Inclusions Verification of inclusion content shall be carried out on a sample forged with either: a reduction betwe
32、en15 : 1 to20 : 1 from the ingot, or, a maximum reduction of4 : 1 from the forging stock. The forged test sample diameter or thickness shall be U 25mm. 1) Published as AECMA Prestandard at the date of publication of this standard 2) Published as AECMA Standard at the date of publication of this stan
33、dard 3) In preparation at the date of publication of this standardEN 2157-2:1993 4 BSI 07-1999 Evaluation shall be made along the longitudinal axis of the forging stock in accordance with EN2951 (microscopical method) and shall meet the requirements of the material standard. Test frequency shall be
34、in accordance withTable 1. 6 External defects The surface of the forging stock shall be free from defects which would be detrimental to further working. All forging stock shall be visually examined in descaled condition. Defects may be removed by local dresssing providing the area of rectification i
35、s adequately blended into the surface and the dimension affected remains within any tolerance which may be specified. Forging stock shall be inspected after dresssing to verify that defects have been removed. 7 Mechanical tests Tests shall be carried out on a sample forged as defined in sub-clause5.
36、2. The sample shall be heat treated in accordance with the requirements of the material standard. 7.1 Tensile test Tests shall be performed in accordance with EN2002-1 on proportional round test pieces. The form and size shall be selected from EN2002-1. Test frequency shall be in accordance with Tab
37、le 1. The results shall meet the requirements of the relevant material standard. 7.2 Beam impact test Tests shall be performed in accordance with either EN2003-1 or EN2003-2 as required by the material standard. Test frequency shall be in accordance with Table 1. The results shall meet the requireme
38、nts of the relevant material standard. 8 Special tests Special tests and inspection may be required by the purchaser (e.g.:macrography, fracture inspection, sulphur printing/etching, up-ending, overheating checks, etc.). In such cases, after agreement between the manufacturer and the purchaser, the
39、nature of test, methods, number and acceptance criteria shall be specified on the order or in the inspection schedule. 9 Marking All products shall bear the following identification marking : material standard number; cast number; product identification number, when required; identification of manuf
40、acturer and, where appropriate, of plant; inspection stamp. Identification marking shall be hard stamped atleast once on each product. Table 1 Summary of requirements Requirement Clause Product Inspection/Testing Method Standard Frequency Chemical composition see EN 2157-1 All 1 per cast Dimensions
41、4 All Appropriate see 4 Internal defects 5.1 All Ultrasonic inspection EN 2003-8 100 % 5.2 If required by the material standard Inclusion content EN 2951 1 per cast External defects 6 All Visual 100 % Mechanical tests Tensile test 7.1 If required by the material standard Tensile EN 2002-1 1 per cast
42、 Beam impact test 7.2 Beam impact EN 2003-1 or EN2003-2 3 per cast Marking 9 All Visual See 9BSEN 2157-2:1993 BSI 07-1999 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Aerospace Standards Poli
43、cy Committee (ACE/-) to Technical Committee ACE/61 upon which the following bodies were represented. Aluminium Federation British Forging Industry Association British Investment Casting Trade Association British Steel Industry Copper Development Association Light Metal Founders Association Ministry
44、of Defence Seamless Steel Tube Association Society of British Aerospace Companies Limited British Steel Industry Department of Trade and Industry (National Physical Laboratory) National annex NB (informative) Cross-references There are no British Standards corresponding to EN2002-1, EN2003-1, EN2003
45、-2, EN2003-8, EN2069-3 and EN2951 referred to in the text. It is envisaged that British Standards, identical in number and text, will be published in due course. Publication referred to Corresponding British Standard EN 2157-1 BS EN 2157-1:1993 Aerospace Series. Steel forging stock and forgings. Tec
46、hnical specification. Part 1. General requirementsBS EN 2157-2:1993 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 standards in Europe and at the international level.
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