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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 Standard Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:17:57 GMT+00:00 2006, Uncontrolled C
2、opy, (c) BSI BS EN 2157-2:1993 This British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 December 1993 BSI 07-1999 The following BSI references relate to the work o
3、n this standard: Committee reference ACE/61 Draft for comment 90/80846 DC ISBN 0 580 22106 7 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countr
4、ies: AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standardiseringsraad FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for Standardization Icela
5、ndTechnological Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugus da Qualidade Spai
6、nAsociacin Espaola de Normalizacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01
7、:17:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2157-2:1993 BSI 07-1999i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Text of EN 2157-23 National annex NA (informative) Committees responsibleInside back cover National annex NB (informative) Cross-re
8、ferencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:17:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 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 E
9、nglish lanugage version of EN 2157-2:1993, Aerospace Series Steel Forging stock and forgings. Technical specifications Part 2: Forging stock, published by the European Committee for Standardization (CEN). EN 2157-2 was produced as a result of international discussion in which the United Kingdom took
10、 an active 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 do
11、cument comprises a front cover, an inside front cover, pages i and ii, the EN 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 fro
12、nt cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:17:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 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,
13、 forging English version Aerospace series Steel Forging stock and forgings Technical specification Part 2 Forging stock Srie arospatiale Acier Produits destins la forge Pices forges et pices matrices Spcification technique Partie 2 Produits destins la forge Luft- und Raumfahrt Stahl Schmiedevormater
14、ial und Schmiedestcke Technische Lieferbedingungen Teil 2 Schmiedevormaterial This European Standard was approved by 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
15、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, German). A version in any oth
16、er 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, Denmark, Finland, France, Germany, Greece, Iceland,
17、Ireland, Italy, Luxembourg, 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 1993 Copyright reserved to CEN m
18、embers Ref. No. EN 2157-2:1993 E Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:17:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2157-2:1993 BSI 07-1999 2 Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inquiries a
19、nd 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, prior to its presentation to CEN. This Standard was submitted for Formal Vote, an
20、d 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 February 1994, and conflicting national standards shall be withdrawn at the latest by February 1994. According to the CEN
21、/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, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword
22、2 1Scope3 2Normative references3 3Manufacture3 4Dimensions and tolerances3 5Internal defects3 6External defects4 7Mechanical tests4 8Special tests4 9Marking4 Table 1 Summary of requirements4 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:17:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN
23、 2157-2:1993 BSI 07-19993 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 EN 2157-1. Bars and sections conforming to EN 2069-3 may be used as forging stock provided th
24、at an agreement 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 refe
25、rences 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 references the
26、 latest edition of the publication referred to applies. EN 2002-1, Aerospace series Test methods for metallic materials Part 1: Tensile testing at ambient temperature1). EN 2003-1, Aerospace series Test methods for steel products Part 1: Charpy impact test (U notch)1). EN 2003-2, Test methods for st
27、eel products Part 2: Izod impact test Aerospace series2). 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 testin
28、g requirements for steel wrought products Part 3: Inspection and testing requirements for bars and sections Aerospace series2). EN 2157-1, Aerospace series Steel Forging stock and forgings Technical specification Part 1: General requirements. EN 2951, Aerospace series Test methods for steels Microsc
29、opic examination for assessing the content of non metallic inclusions3). 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 w
30、orked with a minimum reduction of 4 : 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 a
31、dopted 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 tech
32、nique 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
33、 accordance with EN 2003-8. Acceptance criteria: forging stock k 250 mm diameter : class 2 of EN 2003-8; forging stock 250 mm diameter : 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 re
34、duction between 15 : 1 to 20 : 1 from the ingot, or, a maximum reduction of 4 : 1 from the forging stock. The forged test sample diameter or thickness shall be U 25 mm. 1) Published as AECMA Prestandard at the date of publication of this standard 2) Published as AECMA Standard at the date of publica
35、tion of this standard 3) In preparation at the date of publication of this standard Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:17:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 2157-2:1993 4 BSI 07-1999 Evaluation shall be made along the longitudinal axis of the forging stock in acc
36、ordance with EN 2951 (microscopical method) and shall meet the requirements of the material standard. Test frequency shall be in accordance with Table 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 sh
37、all be visually examined in descaled condition. Defects may be removed by local dresssing providing the area of rectification is 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 ver
38、ify that defects have been removed. 7 Mechanical tests Tests shall be carried out on a sample forged as defined in sub-clause 5.2. 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 EN 2002-1 on
39、proportional round test pieces. The form and size shall be selected from EN 2002-1. Test frequency shall be in accordance with Table 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 EN 2003-1 or EN 2
40、003-2 as required by the material standard. Test frequency shall be in accordance with Table 1. The results shall meet the requirements of the relevant material standard. 8 Special tests Special tests and inspection may be required by the purchaser (e. g.: macrography, fracture inspection, sulphur p
41、rinting/etching, up-ending, overheating checks, etc.). In such cases, after agreement between the manufacturer and the purchaser, the 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
42、 identification marking : material standard number; cast number; product identification number, when required; identification of manufacturer and, where appropriate, of plant; inspection stamp. Identification marking shall be hard stamped at least once on each product. Table 1 Summary of requirement
43、s RequirementClauseProduct Inspection/Testing MethodStandardFrequency Chemical compositionsee EN 2157-1All1 per cast Dimensions4AllAppropriate see 4 Internal defects5.1AllUltrasonic inspection EN 2003-8100 % 5.2If required by the material standard Inclusion content EN 29511 per cast External defects
44、6AllVisual100 % Mechanical tests Tensile test 7.1If required by the material standard TensileEN 2002-11 per cast Beam impact test 7.2Beam impact EN 2003-1 or EN 2003-2 3 per cast Marking9AllVisualSee 9 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 03 01:17:57 GMT+00:00 2006, Uncontrolled Copy,
45、 (c) BSI BS EN 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 Policy Committee (ACE/-) to Technical Committee ACE/61 upon which the following bodies
46、were represented. Aluminium Federation British Forging Industry Association British Investment Casting Trade Association British Steel Industry Copper Development Association Light Metal Founders Association Ministry of Defence Seamless Steel Tube Association Society of British Aerospace Companies L
47、imited British Steel Industry Department of Trade and Industry (National Physical Laboratory) National annex NB (informative) Cross-references There are no British Standards corresponding to EN 2002-1, EN 2003-1, EN 2003-2, EN 2003-8, EN 2069-3 and EN 2951 referred to in the text. It is envisaged th
48、at British Standards, identical in number and text, will be published in due course. Publication referred toCorresponding British Standard EN 2157-1BS EN 2157-1:1993 Aerospace Series. Steel forging stock and forgings. Technical specification. Part 1. General requirements Licensed Copy: sheffieldun s
49、heffieldun, na, Fri Nov 03 01:17:57 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 2157-2:1993 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sur
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