1、AECMA STANDARD NORME AECMA AECMA NORM prEN 2540 Edition P 1 December 1997 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA) Gulledelle 94 - B-I 200 BRUXELLES - Tel. (+32) 2 775 81 1 O - Fax. (+32) 2 775 81 1 1 ICs: Descriptors: ENGLISH VERSION Aerospace series Steel FE-PM3902 (X7
2、CrNiAIl7-7) Air melted Solution treated and precipitation hardened Sheet and strip aI6mm 1 240 MPa I Rm I 1 450 MPa Srie arospatiale Acier FE-PM3902 (X7CrNiAi17-7) labor lair Mis en solution et durci par prcipitation Tles et bandes aI6mm 1 240 MPa I Rm I 1 450 MPa Luft- und Raumfahrt Stahl FE-PM3902
3、 (X7CrNiAI17-7) Lufterschmolzen Lsungsgeglht und ausgelagert Bleche und Bnder aS6mm 1 240 MPa 5 Rm I 1 450 MPa This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of A
4、ECMA-Members. It has been technically approved by the experts of the concerned Technical Committee following 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
5、functionally, without re-identification of the standard. After 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)
6、 for formal vote. I Nota - Extra copies can be supplied by B.N.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 I Edition approved for publication I 1997-1 2-31 AECMA Gulledelle 94 I B
7、-1200 BRUXELLES I I C5 Chairman Mr Odorico aecma 1997 STD-AECMA PREN 2540-ENGL 1997 m 1012311 0DL37b1 b82 m page3 prEN 2540: 1997 O Introduction This standard is part of the series of EN metallic material standards for aerospace applications. The general organization of this series is described in E
8、N 4258. This standard has been prepared in accordance with EN 4500-5. 1 Scope This standard specifies the requirements relating to: Steel FE-PM3902 (X7CrNiAI 17-7) Air melted Solution treated and precipitation hardened Sheet and strip al6mm 1 240 MPa I R, 5 1 450 MPa for aerospace applications. 2 No
9、rmative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions o
10、f 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 publication referred to applies. EN 2043 Aerospace series - Metallic materials - General requirements for semi-finished product qualific
11、ation (excluding forgings and castings) 1) EN 4235-2 Aerospace series - Steel wrought products - Technical specification - Part 2: Plate, sheet and strip 1) EN 4258 Aerospace series - Metallic materials - General organization of standardization - Links between types of EN standards and their use 1)
12、EN 4500-5 Aerospace series - Metallic materials - Rules for drafting and presentation of material standards - Part 5: Specific rules for steel 1) 1) Published as AECMA Prestandard at the date of publication of this standard Previous page is blank STD-AECMA PREN 2540-ENGL 1777 M LO123LL 00137b2 517 P
13、age 4 prEN 2540: 1997 Material designation Chemical I Element r Steel FE-PM3902 (X7CrNiAI17-7) C I si I Mn I PI SI Cr I Cu I Ni I AI I Fe composition % min. - - - - - 16,O - 6,50 0,75 max. 0,09 1,OO 1,OO 0,040 0,030 18,O 030 7,75 1,50 Base 1 Air melted Limit dimension(s) mm Technical specification -
14、1 a16 EN 4235-2 14.1 I Form I Sheet and strip I Delivery condition k1Methodf production Solution treated Cold rolled Delivery condition code Use condition Heat treatment 1 W Solution treated and precipitation hardened Delivery condition 740 C 1 81 780 “C It 2 90 min + cool to 01 20 “C /within 1 hi h
15、old for 30 min + 550 “CI 81 580 “Clt 2 90 min /AC Test sample(s) See EN 4235-2 II I Test piece) Heat treatment I 1 025 “CI 0s 1 055 “C / t 2 30 min /AC or OQ I I I Heat treatment See EN 4235-2 Delivery condition I Use condition 6.2 7 - lo Thickness of cladding on % - - - each face Characteristics 16
16、 17 18 Reduction ofarea Z % - - - Hardness 5 229 HV 5 229 HV 2 38 HRC Shear strength Rc MPa - - - 19 20 I 9 I Dimensions concerned I mm I a15 I 5ar6 I I - Bending k- 0,5a=180“ 13 a = 180 O Impact strength - a56 24 25 26 27 _I - C Elongation a% - Rupturestress CR MPa - Elongation at A% - Notes (see l
17、ine 98) - rupture I 11 I Direction of test piece I I See EN 4235-2 I I - - I Ambient Rp0,2 MPa - 2 1 035 - Proof stress T Strength R, MPa - - 1 2405Rm1 450 - 25 Elongation A% - i1 I Ixternai defects Marking inspection Dimensional inspection Notes Typical use Page 5 prEN 2540: 1997 See EN 4235-2 - STD-AECMA PREN 254II-ENGL 1777 = 1012311 00137b4 371 Page 6 prEN 2540: 1997 Product qualification See EN 2043 3ualification programme to be agreed between manufacturer and purchaser.
