1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2009 03 25 N-STATUS No Replacement Named L. Sinclair, FNA 2003 03 13 Revised Para 3.0 inserted ; Para 3.1, 3.6, 4 deleted 1981 04 22 SM/EQ 8767TP Released Printed copies are uncontrolled Page 1 of 2 Copyrigh
2、t 2009, Ford Global Technologies, Inc. STEEL, MOLYBDENUM ALLOYED SQ-M1A9440-A28H NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a molybdenum-alloyed high grade structural steel. 2. APPLICATION This specification was released originally for the manufacture of tra
3、nsmission 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). 3.2 ANALYSIS, % (Checking according to SAE
4、J 408 c; permissible variations according to SAE J 409 b) C 0.24 - 0.30 Si 0.20 - 0.35 Mn 0.60 - 1.00 Mo 0.20 - 0.30 P max 0.035 S 0.035 - 0.050 Cr 0.10 - 0.20 Ni 0.08 - 0.25 or Sum Cr+Ni 0.20 - 0.35 3.3 HARDENABILITY (Checking according to SAE J 406 a) Must conform to the hardenability band given i
5、n Figure 1. 3.4 AUSTENITE GRAIN SIZE 5 - 8 with max (Checking according to SAE J 418 a) 20 % 4 ENGINEERING MATERIAL SPECIFICATION SQ-M1A9440-A28H Page 2 of 2 Copyright 2009, Ford Global Technologies, Inc. 3.5 DEGREE OF PURITY 3.5.1 Macroscopic Degree Of Purity Must conform to Ford specification SQ-M
6、99P9000-A. 3.5.2 Microscopic Degree Of Purity 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
