1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2002 09 26 Revised Updated and renumbered 1991 09 10 NEO1E10127076022 Released C. Webster Printed copies are uncontrolled Page 1 of 2 Copyright 2002, Ford Global Technologies, Inc. VALVE INSERT, Mo-Cr-V-Co-N
2、i-Fe ALLOY WSE-M1A324-A1 1. SCOPE The material defined by this specification is a Molybdenum-Chromium-Vanadium-Cobalt-Nickel-Iron alloy casting. 2. APPLICATION This specification was released originally for exhaust valve seat inserts. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIAL
3、S Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION, weight % (ASTM A 751/ASTM E 1019/ASTM A 484) Total Carbon 2.0 - 2.5 Silicon 1.5 max Manganese 1.0 max Molybdenum 10.0 - 14.0 Chromium 14.0 -
4、 18.0 Vanadium 1.3 - 1.7 Cobalt 5.5 - 7.5 Nickel 1.0 - 2.0 Iron Balance 3.3 HEAT TREATMENT 2 1/2 h at 693 C followed by air cool. 3.4 HARDNESS 50 - 60 HRC (ASTM E 18/ISO 4498) ENGINEERING MATERIAL SPECIFICATION WSE-M1A324-A1 Page 2 of 2 Copyright 2002, Ford Global Technologies, Inc. 3.5 MICROSTRUCTU
5、RE The microstructure shall consist of a uniform distribution of Molybdenum-Chromium Vanadium Carbides in a fine lamellar pearlite. The dendrite areas which are of light color shall have a fine dispersion of Chromium-Molybdenum Carbides which can be detected at high magnification, 1000X. 3.6 SURFACE CONDITION Surfaces shall be free of scale and rust. Nicks, cracks, burrs and depressions shall not exceed 0.25 mm in any direction. Visual inspection is to be performed under white light without aid of magnification.
