1、BRITISH STANDARD BS EN 2157-3:1993 Steel Forging stock and forgings Technical specifications Part 3: Pre-production and production forgings The European Standard EN2157-3:1993 has the status of a British Standard UDC 669.14-4:621.1:629.7BSEN 2157-3:1993 This British Standard, having been prepared un
2、der the directionof the Aerospace Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15December1993 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference ACE/61 Draft for comment 90/80847 DC ISBN 0 58
3、0 22107 5 Cooperating organizations 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 normalisa
4、tion Denmark Dansk Standardiseringsraad 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 o
5、f Ireland Italy Ente Nazionale 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 Standardise
6、ringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN 2157-3:1993 BSI 08-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2
7、 Text of EN 2157-3 3 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN 2157-3:1993 ii BSI 08-1999 National foreword This British Standard has been prepared under the direction of the Aerospace Standards Pol
8、icy Committee and is the English language version of EN2157-3:1993, Aerospace Series Steel Forging stock and forgings Technical specifications Part3: Pre-production and production forgings, published by the European Committee for Standardization (CEN). EN 2157-3 was produced as a result of internati
9、onal discussion in which the United Kingdom took 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
10、from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages 2 to 8, 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 ind
11、icated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 2157-3 August 1993 UDC 669.14-4:621.1:629.7 Descriptors: Aircraft industry, forgings, die forgings, steels, specifications English version Aerospace series Steel Forging stock and forgings Te
12、chnical specification Part 3 Pre-production and production forgings Srie arospatiale Acier Produits destins la forge Pices forges et pices matrices Spcification technique Partie3 Pices types et pices de srie Luft- und Raumfahrt Stahl Schmiedevormaterial und Schmiedestcke Technische Lieferbedingungen
13、 Teil3 Ausfallmuster-und Serienschmiedestcke This European Standard was approved by CEN on1993-08-19. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of anational standard without any alteration. Up
14、-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 other language made by translation und
15、er 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, Ireland, Italy, Luxembourg, Netherl
16、ands, 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 members Ref. No. EN 2157-3:1993 EEN
17、2157-3:1993 BSI 08-1999 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 draft standard has successively received the approval of the Nation
18、al Associations and the Official Services of the member countries of AECMA, prior 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
19、or by endorsement, at the latest by February1994, and conflicting national standards 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,
20、 Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Pre-production forgings 3 4 Manufacture of production forgings 4 5 Inspection and testing of production f
21、orgings 4 6 Marking 6 Table 1 Untitled 5 Table 2 Summary of requirements 7EN 2157-3:1993 BSI 08-1999 3 1 Scope The present standard specifies the particular requirements for steel forgings produced from forging stock complying with EN2157-2. This standard shall be used in conjunction with EN2157-1.
22、This standard also applies to pre-production forgings intended for the qualification of the method of manufacture and inspection. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the
23、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 edition of the p
24、ublication referred to applies. EN 2002-1, Aerospace series Test methods for metallic materials Part1: Tensile testing at ambient temperature 1) . EN 2002-7, Aerospace series Test methods for metallic materials Part7: Hardness test 1) . EN 2002-8, Aerospace series Test methods for metallic materials
25、 Part8: Micrographic determination of grain size 1) . EN 2002-16, Aerospace series Test methods for metallic materials Part16: Dye penetrant testing 2) . EN 2002-22, Aerospace series Test methods for metallic materials Part22: Plane strain fracture toughness test 2) . EN 2003-1, Aerospace series Tes
26、t methods for steel products Part1: Charpy impact test (U notch) 1) . EN 2003-2, Test methods for steel products Part2: Izod impact test Aerospace series 3) . EN 2003-8, Aerospace series Test methods for products in steel, titanium, titanium alloys and heat resisting alloys Part8: Ultrasonic inspect
27、ion for semi-finished products (rolled, drawn, extruded, forged) 2) . EN 2003-11, Aerospace series Test methods for austenitic stainless steels Part11: Determination of resistance to intergranular corrosion by the Huey method 1) . EN 2078, Aerospace series Metallic materials Manufacturing schedule I
28、nspection schedule Inspection and test report Description and rules for use. EN 2157-1, Aerospace series Steel Forging stock and forgings Technical specification Part1: General requirements. EN 2157-2, Aerospace series Steel Forging stock and forgings Technical specification Part2: Forging stock. EN
29、 2857, Aerospace series Test methods for ferromagnetic materials Magnetic particle testing 2) . 3 Pre-production forgings 3.1 General 3.1.1 The following requirements shall be specified on the order, drawing and/or inspection schedule: number of forgings to be examined by the manufacturer and/or the
30、 purchaser; heat treatment condition; type and number of tests and inspections necessary to evaluate and quality the manufacturing process (dimensions, mechanical and metallurgical properties, etc.); manufacturing schedule as defined in EN2078, if necessary. 3.1.2 The inspection and tests on pre-pro
31、duction forgings shall be carried out and recorded to allow the definition of the optimum techniques for the inspection and tests of production forgings, including, where appropriate, the ultrasonic test method (probe, frequency, angle of incidence, etc.). 3.1.3 The inspection and tests carried out
32、on pre-production forgings shall include those which will be carried out on production forgings. 3.2 Inspection and test report In addition to the information required by EN2078, the inspection and test report on the pre-production forgings shall provide all technical information to allow the evalua
33、tion of the quality of these parts, e.g.photographs taken during macro and micrographic examination, results of dimensional measurements etc. 3.3 Acceptance of pre-production forgings When all inspection and test results relative to pre-production forgings have been reported and accepted, the purcha
34、ser shall give his written agreement for series production. 1) Published as AECMA Pre-standard at the date of publication of this standard 2) In preparation at the date of the publication of this standard 3) Published as AECMA Standard at the date of publication of this standardEN 2157-3:1993 4 BSI
35、08-1999 The inspection schedule and if required the manufacturing schedule shall be agreed between the manufacturer and the purchaser. 4 Manufacture of production forgings 4.1 At the start of production, the manufacturing schedule may be completed to allow the manufacturer to guarantee the reproduci
36、bility of the product with more certainty. All information, no matter how minor, shall be recorded in the manufacturing schedule. 4.2 When a manufacturing schedule has been agreed, no change in manufacturing method shall be made without the written approval of the purchaser. When such changes are ne
37、cessary, the purchaser shall decide if new pre-production forgings shall be manufactured and tested. The manufacturing schedule and the inspection schedule shall be modified accordingly. 4.3 Any change in the form of the forging requiring a new or revised drawing may require, at the request of the m
38、anufacturer or purchaser: manufacture of new pre-production forgings, or modification of the manufacture schedule and/or the inspection schedule. 4.4 Manufacturing schedules and inspection schedules, which are modified during production shall be subjected to the same approval process as the original
39、 documents. 4.5 No straightening operations shall be permitted after final heat treatment unless previously agreed between the manufacturer and the purchaser and stated in the manufacturing schedule. 4.6 Where a manufacturing schedule is not required, any major change in the manufacturing process wh
40、ich could influence the quality of the forgings shall be reported to the purchaser. 5 Inspection and testing of production forgings Inspection and testing shall be carried out on production forgings under the same conditions as applied to pre-production forgings. 5.1 Non destructive tests 5.1.1 Exte
41、rnal defects All surfaces of each forging shall be visually examined after abrasive blasting and/or etching. This operation shall be followed by either: a) magnetic particle examination in conformity with EN 2857, or b) dye penetrant testing in conformity with EN2002-16. 4) The test method shall be
42、indicated in the order or inspection schedule, if not indicated in these documents, the test method used shall be: a) for magnetic steels; b) for non magnetic steels. The surface of forgings shall be free from harmful defects, such as cracks, laps and single or discontinuous inclusion indications8mm
43、 in length, unless shorter lengths are specified on the drawing or inspection schedule. Local dressing may be carried out by the manufacturer provided the dimensions of the product remain within the tolerance limits. The dressed area shall be re-inspected to verify that defects have been removed. 5.
44、1.2 Internal defects When required by the drawing or the inspection schedule, the forgings shall be submitted to an ultrasonic inspection. The areas to be inspected shall be defined by these documents. Inspection shall be conducted in conformity with the requirements of EN2003-8, and the method defi
45、ned during evaluation of the pre-production forgings. The inspection schedule shall include a sheet detailing the ultrasonic technique. Unless otherwise stated by the purchaser, the acceptance criteria shall be class2 of EN2003-8. Where the shape does not permit inspection at the final stage of fabr
46、ication, it may be carried out at an earlier stage by agreement between the manufacturer and the purchaser. The test frequency is given in Table 2. 5.1.3 Batch uniformity To ensure that the forgings have been properly heat treated and that the batch is uniform, hardness shall be measured, unless oth
47、erwise specified by the purchaser. Hardness shall be measured at the location selected by the manufacturer unless otherwise specified on the drawing or inspection schedule. Hardness shall be determined in accordance with EN2002-7 and the results shall comply with the requirements of the material sta
48、ndard. Where no hardness value is indicated on the material standard, the method used to demonstrate batch uniformity shall be at the option of the manufacturer. 4) Dye penetrant testing alone will not guarantee the detection of inclusions.EN 2157-3:1993 BSI 08-1999 5 Table 1 Hardness measurements o
49、n forgings in a batch and on test samples representing the batch shall be made by the same method and under the same conditions of loading. The number of forgings to be tested for each batch shall be as indicated inTable 1. 5.1.4 Dimensions and tolerances The dimensions and tolerances shall conform to the drawing or the inspection schedule. The dimensions specially indicated shall be checked on each forging. For other dimensions, the frequency of exa
