1、A. E,C . M. A. STAN DAR D NORME A.E.C.M.A. A.E.C.M.A. NORM Edition approved for publication Comments should be sent within six months after the date of publication decision 88, Bd. Malesherbes 17th October I988 A.E.C.M.A. 75008 PARIS - FRANCE prEN 3550 Issue P 1 October 1988 C5 Chairman J. ODORICO E
2、DITE PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL 88. boulevard Malesherbes, 75008 PARIS -TL. 45-63-82-85 UDC : Key words : ENGLISH VERSION Aerospace series Aluminium alloy (2024) Solution treated, stretched and artificially aged (T8511) Extruded bars and sections (a or D) pre-
3、standard 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 approvedby the experts of the concerned AECMA Commission following comment by the Membe
4、r countries. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (
5、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 final vote. aecma 1988 AECMA _ PREN3550 - &e aI &0123& OOObO&2 3 prEN 3550 Page 3 S Scope arid field of application This st
6、andard specifies fer the aerospace appl fiation, the inechanical prcperties for extruded bar and sectititi, (a or D) ) mm - 400 u - - 385 - 400 Rpsz MPa *I Proof Stress - 2 2 Strength MPa *I - 440 - 455 - 455 Elongation A % - 4 - 5 - 4 u - r - Reduction of area % - iardness IH8 I - I 130 (for inform
7、ation) ending npact IK I I Temperature I - e I OC I Timo I t I h I - Elongation I a I % I - Elongation atrupture I A I % I ES ee Ilne 98 I *I 1 MPa= 1 N/mrn2 AECMA PREN3550 L03 20 The rules governing the designation of semi-finished products are indicated in standard EN 2600. When the codified designation is used, the identification code shall be as follows : 1EN 3550 U XX - Haterial standard number I-Letter I I code (see 6.2) Appropriate dimensional standard code (see 5.3) .Data concerning dimension (see EN 2600)
