1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2009 03 25 N-STATUS No Replacement Named L. Sinclair, FNA 2002 07 23 Revised Updated and renumbered 1975 08 27 Released SM/ET 0976 TPPrinted copies are uncontrolled Page 1 of 2 Copyright 2009, Ford Global Te
2、chnologies, Inc. STEEL, CHROMIUM-MOLYBDENUM ALLOYED SQ-M1A9441-A20H NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a chromium-molybdenum alloyed high grade structural steel. 2. APPLICATION This material is generally used for manufacture of transmission gears, wh
3、ich are case-hardened after machining. 3. REQUIREMENTS 3.1 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 C 0.17 - 0.23 % Si 0.20 - 0.35 % Mn 0.50 - 0.90 %
4、 Cr 0.65 - 1.10 % Mo 0.20 - 0.30 % P 0.035 % max S 0.020 - 0.035 % (Checking according to SAE J408 c; permissible variations according to SAE J409 b) 3.3 HARDENABILITY Must conform to the hardenability band given in Figure 1. (Checking according to SAE J406 a) 3.4 AUSTENITE GRAIN SIZE 5 - 8 with max
5、 20 % 4 (Checking according to SAE J418 a) ENGINEERING MATERIAL SPECIFICATION SQ-M1A9441-A20H Page 2 of 2 Copyright 2009, Ford Global Technologies, Inc. 3.5 DEGREE OF PURITY 3.5.1 Degree of Purity, Macroscopic Must conform to Ford Specification SQ-M99P9000-A 3.5.2 Degree of Purity, Microscopic Must conform to Ford Specification SQ-M99P9001-A. 4. FOR ENGINEERING APPROVED SOURCE SEE RELEASE
