1、CEN PREN*4235 PART*l 94 = 3404587 0062762 T7h m AECMA STANDARD prEN 4235 NORME AECMA Part 1 Edition P 1 February 1994 AECMA NORM DIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.98.
2、76 UDC : Descriptors : ENGLISH VERSION Aerospace series Steel Wrought products Technical specification Part 1 : General requirements Srie arospatiale Acier Produits corroys Spcification technique Partie 1 : Exigences gnrales Luft- und Raumfahrt Stahl Umgeformte Erzeugnisse Technische Lieferbedingung
3、en Teil 1 : Allgemeine Anforderungen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts
4、 of the concerned Technical Committee foil0 wing comment by the Member countries. Subsequent to the publication of this prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. Aft
5、er examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. Nota - Extra copies can be supplied by B.N
6、.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX Comments should be sent within six months after the date of publication to AECMA Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cedex - FRANCE C5 Chairman M. Odorico Edition approved f
7、or publication 1994-02-28 aecma 1994 CEN PREN*4235 PARTUL 9Lt m 340Li589 00b2763 902 m Page 2 prEN 4235-1 : 1994 Contents list 1 2 3 4 5 6 7 8 9 10 11 12 13 Scope Normative references Definitions Quality assurance Manufacture Traceability Freedom from defects Testing Marking Acceptance Inspection an
8、d test report Packing Wording of orders 4 CEN PREN*4235 PART* 6 mm, supplied with sheared or sawn edges. 3.11 Section Rolled or extruded product of uniform cross section other than a bar and supplied in straight lengths. 3.12 Tube Hollow product of uniform thickness supplied in straight lengths. 3.1
9、3 Wire Rolled or rolled and drawn product of uniform solid section supplied in coil or on spool. 3.14 Batch A batch consists of products : - of the same form; - - from the same cast; - - - of the same nominal dimensions, or having the same drawing number; manufactured in the same campaign; in the sa
10、me heat treatment or metallurgical condition; from the same heat treatment charge or, if approved by the purchaser, from the same heat treatment campaign which shall be specified in the manufacturing schedule. 3.15 Manufacturer See EN 2000. 3.16 Purchaser Body which purchases the products from a man
11、ufacturer or a stockist in accorcmce with the requirements of the user. NOTE : The purchaser may also be the user. 3.17 User See EN 2000. 3.18 Inspection schedule See EN 2078. 3.19 Manufacturing schedule See EN 2078. CEN PRENa4235 PART*:L 94 3404587 O062767 558 W Selected temperature OC Page 6 prEN
12、4235-1 : 1994 Tolerances OC 3.20 Inspection and test report See EN 2078. 3.21 “Capability clause“ Reference to “capability clause“ signifies that sufficient evidence of a statistical nature with respect to the properties under consideration can be submitted to show that the requirements of the relev
13、ant standard will be met on the basis of a reduced amount of testing. Such action in no way reduces the obligations of the manufacturer to fulfil all requirements. If subsequent testing indicates that a product does not comply with the requirements, the batch shall be rejected. 4 Quality assurance 4
14、.1 See EN 2000. Approval of the quality system of manufacturers 4.2 Product qualification See material standard. 5 Manufacture 5.1 standard and the applicable part of this standard (EN 4235-2 to EN 4235-5). The product shall be manufactured in accordance with the requirements of the relevant materia
15、l 5.2 A manufacturing schedule shall be established and applied in accordance with EN 2078. 5.3 The product shall be supplied in the delivery condition specified in the material standard. If there is more than one delivery condition in the material standard, the condition of supply shall be specifie
16、d on the order. If a specific temperature (value and tolerance) is stated in the material standard or on the order, that temperature shall be mandatory. If a range is stated, a temperature within that range reduced by the furnace tolerances shall be selected.Unless otherwise specified, the charge sh
17、all be ,maintained at the temperature subject to the tolerances in table 1 for the period stated. Table 1 e 1250 f 15 750 58 5 1250 If a specific time is stated in the material standard or on the order, a tolerance of (O, +20) % shall be applied. I CEN PREN*4235 PART*L 94 m 3404589 OOb2b! 494 m Page
18、 7 prEN 4235-1 : 1994 6 Traceability Each product shall be identifiable to its batch at all stages of manufacture and delivery. 7 Freedom from defects All products shall be free from irregularities not complying with the requirements of the material standard or the order, or prejudicial to the subse
19、quent manufacture or use of the product. Notwithstanding previous acceptance complying with this standard, any product that is found, at a later stage, to contain such defects may be rejected. 8 Testing The tests required by the material standard or the order shall be performed in accordance with th
20、e requirements of the appropriate test standard. If a test standard does not exist, the method shall be agreed upon between the manufacturer and the purchaser. The frequency of testing shall be as specified in EN 4235-2 to EN 4235-5, unless otherwise specified on the order. Where necessary the locat
21、ion and the direction of the test samples shall be specified on the order. 8.1 Chemical composition The chemical composition shall comply with the requirements of the relevant material standard. The elements which are not specified in the material standard shall not be intentionally added to the ste
22、el except for treating the melt before casting. The specified ranges of chemical composition are based on cast analysis, any subsequent analytical checks on the product shall take into consideration the heterogenity normal to the steel. Such variations shall be agreed upon between the manufacturer a
23、nd the purchaser. The chemical composition of each cast shall be determined. Samples for analytical purposes shall be representative of the cast. Additionally for remelted products the samples shall be representative for the remelting ingot, taking into account the macro-segregations. The method of
24、analysis shall be at the option of the manufacturers discretion but, in cases of dispute, the method set out in the relevant IS0 standard shall be used. If no IS0 standard exists, an analytical method shall be used that can be calibrated to an accepted reference standard. 8.2 Preparation of the test
25、 samples and test pieces Test samples shall not be worked after removal from the product they represent. Test samples taken from finally heat treated poducts (use conditions) shall not be further treated. Test samples representing products in a condition other than the condition of use shall be heat
26、 treated in accordance with the material standard before testing. Test samples and associated test pieces shall be marked in such a manner that their identity, location and orientation with respect to the product and the batch is maintained. CEN PRENx4235 PART*L 94 3404589 0062769 320 Page 8 prEN 42
27、35-1 : 1994 8.3 Special tests Special tests or inspections may be required by the purchaser. In such cases, the nature of test, method, frequency and acceptance criteria shall be specified on the order. 8.4 Retests If any requirement is not met, retests shall be carried out under the following condi
28、tions. 8.4.1 If the test procedure or the test piece preparation is faulty, testing shall be re-applied at the original frequency after identification of the cause of failure. When failure cannot be attributed to a faulty test procedure or to test piece preparation, additional identical test samples
29、 shall be selected at twice the original frequency. Tensile, impact, creep and creep rupture tests At least one of the samples shall be taken from the product or products with which the original result was obtained (unless already rejected by the manufacturer after suitable identification of the cau
30、se of the failure). If all results are satisfactory, the batch shall be accepted. If one or more results are unsatisfactory, the batch shall be, either : - rejected, or - partially or fully reheat treated and tested as a completely new batch except for chemical composition and inclusion content. 8.4
31、.2 If any test fails to meet the requirement, either : Hardness, bend, flattening and drift test - the remaining products in the batch shall be tested and those which fail be reheat treated and retested as a new batch except for chemical composition and inclusion content, or - the entire batch shall
32、 be reheat treated and retested as a new batch except for chemical composition and inclusion content. For hardness tests the products with an incorrect value shall be submitted to any alternative procedure agreed upon between the manufacturer and the purchaser. 8.4.3 Metallographic examination If th
33、e examination or the test sample preparation is faulty, after identification of the cause of failure, examination shall be re-applied at the original frequency on a test sample located near the first sample. When failure cannot be attribued to a faulty examination or to the tests sample preparation,
34、 the batch shall be either : - rejected, or - partially or fully reheat treated if the structure may be corrected by heat treatment, and tested as a new batch except for chemical composition. If the material fails the cleanness requirements, the product may be cut back before retesting. CEN PRENx423
35、5 PART*L 94 m 3404589 0062770 042 m Page 9 prEN 4235-1 : 1994 8.4.4 Other tests For other tests specific to a product, the retest procedure shall be as defined in the relevant part of this standard or on the order. 8.5 Reheat treatment No product or test sample shall be re-hardened or re-solution he
36、at treated more than once without the agreement of the purchaser. 8.6 Material verification Each product shall be checked at final inspection to ensure that it has been manufactured from the specified material. The method used shall be at the discretion of the manufacturer. 9 Making See : - - - EN 4
37、235-4 for tube; - EN 4235-5 for wire. EN 4235-2 for plate, sheet and strip; EN 4235-3 for bar and section; The method used shall not cause corrosion, crack initiation, contamination or deformation. The frequency of examination adopted by the manufacturer shall be sufficient to permit him to certify
38、compliance with the requirements. 1 O Acceptance If required, the manufacturer shall inform the purchaser or his chosen agent of the scheduled dates for the extraction of samples and acceptance testing, in order that these operations may be witnessed. I I Inspection and test report The manufacturer
39、shall furnish, with each delivery, a report conforming to the requirements of EN 2078 stating the following : - manufacturers name and address; - order number; - material standard number; - delivery condition of products; - description of supplies; - quantity; - cast and batch number; - - inspectors
40、 stamp; - batch and / or test sample heat treatment, if appropriate; results of the mandatory tests, retests and chemical analysis. CEN PRENb4235 PART*L 94 3404589 O062773 T89 Page 10 prEN 4235-1 : 1994 12 Packing If the purchaser does not specify any particular requirements, the manufacturer shall
41、apply suitable protection to ensure that the products are delivered in a satisfactory condition. The exterior of the packing shall bear the following information : - name and address of recipient; - mass; - order number and sufficient information to enable the contents to be related to the relevant
42、documentation. 13 Wording of orders The order shall clearly indicate : quantities to be supplied; dates of delivery; material standard number; delivery condition of products; dimensions and tolerances of products; forwarding address; manufacturing and inspection schedule references; nature and type packing, if required; definition and frequency of any special tests and their retest procedures, if required.
