1、A. E.C. M .A, STANDARD NORM E A.E.C. M.A. A.E.C.M.A. NORM prEN 2767 Issue P 2 March 1988 DIT 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 Steel FE-PL79 Carburized, harden
2、ed and tempered ll80 930 I 830 1300 1250 5 Riii o - u - 9 Elongation A % Reduction of area -_ Hardness HB - - 35 363 2 HB 5 444 - 40 353 5 HB 2 429 Bending Ikl - impsct IKU I = Temperature 6 OC Time th - - i stress U, MPa *) w rc o Elongation a % Elongation at rupture I Notes sae Ilne 98 AECMA PREN2
3、b7 88 W 1032311 0004342 7 prEN 2767 Page 5 1 Jominy hardeiiabi 1 i ty Designation Notes Typical use 2 Distance in mni 1,s 5 9 15 I 25 I 40 1 - HRC max. 47 47 47 46 45 44 HRC min. I 39 I 39 I 39 I 38 I 36 I 33 I The rules governing the designation of senii-finished products are indicated in standari
4、EN 2600. Wheii the codified designation is used, the identification code shall be a! follows : 1 EN Material standard number y76711 U IIXX II- II ,Letter code (see 6.2) I Appropriate dimensional standard code (see 5.3) Data concerning dimension (see EN 2600) 1) Testing requirements for the simulated
5、 case hardening tEst (will be contained in thc standards EN 2069 “Inspection and testing requirements . on the occasion of the nex revision) - One bar per batch. The tensile test piece will be taken in longitudinal direction from the core for bar! of 11 and 30 mm diameter; Por those of 63 mn diameter at 12,5 nm distance from thc surface. Others sections and larger dianieters will be rolled or forged to these dimensions, v iiiyli stressed carburized parts (for i. gears)
