1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2010 02 18 N-STATUS Replaced by EN 10084 28CrS4+H L. Sinclair, NA 2003 03 13 Revised Para 3.0 inserted ; Para 3.5, 3.6, 4 deleted 1975 08 27 SM/ET0976TP Released Printed copies are uncontrolled Page 1 of 2 C
2、opyright 2010, Ford Global Technologies, Inc. STEEL, CHROMIUM ALLOYED SQ-M1A9451-A28H NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a chromium-alloyed high grade structural steel. 2. APPLICATION This specification was released originally for material used for m
3、anufacturing transmission gears, which are case-hardened after machining. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.1 ANALYSIS, % C 0.26 - 0.
4、32 Si 0.20 - 0.35 Mn 0.50 - 0.90 Cr 0.65 - 1.10 P max 0.035 S 0.020 - 0.035 Ni 0.08 - 0.25 Mo 0.02 - 0.08 or Sum of Ni + Mo 0.12 - 0.30 (Checking according to SAE J408 c; permissible variations acc. to SAE J409 b). 3.2 HARDENABILITY Must conform to the hardenability band given in figure 1. (Checking
5、 according to SAE J 406 a). 3.3 AUSTENITE GRAIN SIZE 5 - 8 with max 20 % 4 (Checking according to SAE J 418 a). 3.4 DEGREE OF PURITY ENGINEERING MATERIAL SPECIFICATION SQ-M1A9451-A28H Page 2 of 2 Copyright 2010, Ford Global Technologies, Inc. 3.4.1 Degree of Purity, Macroscopic Must conform to Ford
6、Specification SQ-M99P9000-A. 3.4.2 Degree of Purity, Microscopic Must conform to Ford Specification SQ-M99P9001-A. THE GRAPHIC WHICH SHOULD APPEAR AT THIS POSITION OF THE SPECIFICATION CAN BE OBTAINED BY REFERENCING THIS SPECIFICATION NUMBER FROM : MATERIALS LABORATORY 13/100 FORD RESEARCH & ENGINEERING CENTRE LAINDON, BASILDON. ESSEX ENGLAND SS15 6EE PHONE: (0268) 403366
