1、A, E, Ca M. A. STAN DAR D DrEN 2157 Approved by COMITE DE NORMALISATION of A.E.C,M,A. 1992-07-06 NORME A.E.C.M.A. A.E.C.M.A. NORM The equivalent versions in French and German languages can be supplied by 6.N.A.E - Technopolis 54 - 199, rue JeanJacques Rousseau 92138 ISSY LES MOULINEAUX CEDEX - FRANC
2、E Part 2 Edition 1 July 1992 - GDITE PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATERIEL AEROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cdex -Tl. (1) 47.36.98.76 UDC : Key words : ENGLISH VERSION Aerospace series Steel Forging stock and forgings Technica
3、l specification Part 2 - Forging stock Srie arospatiale Aciers 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 - Schmiedevormate
4、rial This derospace series. standardhas been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). li is published on yellow paper in three equivalent versions (English, French, German). It will be submitted as a draft European Standard to CEN (E
5、uropean Committee for Standardization) for final vote. CEN PRENn2157 (PARTa2) 92 m 3404589 OR29L48 949 . _. . . -. . . prEN 2157-2 Page 2 Contents 1 Scope and field of application 2 References 3 Manufacture 4 Dimensions and tolerances . ;5 Internal defects . -. -* ; - i- - 6 ,Extern$ defects I-tsJ.
6、1 -_ 7 Mechanical tests 8 Special tests 9 Marking .-z .- -_ z -. r* -, -. - . CEN PRENS2357 (PART*2) 92 = 3404589 0029349 885 prEN 21 57-2 Page 3 1 Scope and field of application The present standard specifies the particular requirements for forging stock intended for the manufacture of steel forgin
7、gs. This standard shall be used in conjunction with EN 21 57-1, Ears and sections conforming to EN 2069-3 may be used as forging stock provided that an agreement had been established between the forging stock manufacturer and the purchaser to ensure that the requirements of the present standard are
8、met. . 2 References EN 2002-1 EN 2003-1 EN 2003-2 EN 2003-8 EN 2069-3 EN 2157-1 EN 2951 Aerospace series - Test methods for metallic materials - Part 1 - Tensile testing at ambient temperature 1) Aerospace series - Test methods for steel products - Part 1 - Charpy impact test (U notch) 1) Aerospace
9、series - Test methods for steel products - Part 2 - Izod impact test 2) 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) Aerospace series - Inspe
10、ction and testing requirements for steel wrought products - Part 3 - Inspection and testing requirements for bars and sections 2) Aerospace series - Steel forging stock and forgings - Technical specification - Part 1 - General requirements 2) Aerospace series - Test methods for steels - Microscopic
11、examination for assessing the content of non metallic inclusions 3) 1 ) Published as AECMA pre-standard at the date of publication of this standard. 2) Published as AECMA standard at the date of publication of this standard. 3) In preparation at the date of publication of this standard. prEN 21 57-2
12、 Page 4 3 Manufacture Unless otherwise specified on the material standard, order or inspection schedule, the manufacture to be employed shall be at the discretion of the manufacturer. method of All forging stock shall be mechanically worked with a minimum reduction of 4 : 1 (ratio between cross- sec
13、tion) 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 adopted by the manufacturer shall be sufficient to permit him to
14、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 technique for verifying that adequate material has been removed. The
15、 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 accordance with EN 2003-8. Acceptance criteria : - forging sto
16、ck 5 250 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 reduction between 15 : 1 to 20 : 1 from the ingot, or, -
17、a maximum reduction of 4 : 1 from the forging stock. - The forged test sample diameter or thickness shall be 2 25 mm. Evaluation shall be made along the longitudinal axis of the forging stock in accordance with EN 2951 (microscopical method) and shall meet the requirements of the material standard.
18、Test frequency shall be in accordance with table 1. CEN PREN*Z157 (PARTr2) 92 U 3404589 OOZ7151 433 prEN 2157-2 Page 5 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 descale
19、d 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 verify that defects have been removed.
20、 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 proportional round test pieces. The
21、 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 2003-2 as required by the material s
22、tandard. 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.9. : macrography, fracture inspection, sulphur printing/etching, up-ending, overhea
23、ting 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. I I I I I ! I I I I I I I I . .- CEN PREN*2157 (PARTS21 92 m 3404589 ROEiSZ 37T 0-
24、 prEN 21 57-2 Page 6 r 9 Marking All products shall bear the following identification marking : - material standard number, - cast number, - product identification number, when required, - identification of manufacturer and, where appropriate, of plant, - inspection stamp. Identification marking sha
25、ll be hard stamped at least once on each product. Table I - Summary of requirements f, . -Inspection / Testing Requirement Clause Product Method Standard Frequency Chemical composition see II - 1. - I per cast. EN 2157-1 Dimensions 4 All Appropriate see 4 All I_ Ultrasonic 2003-8 100 % .I . inspecti
26、on I 5.2 I by the I Inclusion I EN 2951 i 1 per cast I internal defects if required - material content standard External defects 6 All Visual 100 % Tensile test 7.1 If required Tensile EN 2002-1 1 per cast tests Beam 7.2 material Beam EN 2003-1 3 tests per Mechanical by the impact test standard impact or cast EN 2003-2 Marking 9 All Visual See 9 ,
