1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisi ons 2002 09 23 Revised Updated and renumbered 1992 07 02 NEO1E10127076061 Released C. Webster Printed copies are uncontrolled Page 1 of 2 Copyright 2002, Ford Global Technologies, Inc. VALVE INSERT, Mo-Cr-W-V-C
2、o-Fe ALLOY WSE-M1A324-A2 1. SCOPE The material defined by this specification is a Molybdenum-Chromium-Tungsten-Vanadium-Cobalt-Tool Steel Casting. 2. APPLICATION This specification was released originally for exhaust valve seat inserts. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERI
3、ALS 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) Total Carbon 1.2 - 1.5 Silicon 0.4 - 0.8 Manganese 0.3 - 0.6 Molybdenum 6.0 - 7.0 Tungsten 5.0 - 6.0 C
4、hromium 4.0 - 5.0 Vanadium 1.35 - 1.65 Cobalt 3.0 - 5.0 Iron Balance 3.3 HEAT TREATMENT Step One: 3 h at 715 730 C followed by air cooling to room temperature. Step Two: 2 h at 675 690 C followed by air cooling to room temperature. 3.4 HARDNESS, HRC 38 - 45 (ASTM E 18/ISO 4498) ENGINEERING MATERIAL
5、SPECIFICATION WSE-M1A324-A2 Page 2 of 2 Copyright 2002, Ford Global Technologies, Inc. 3.5 MICROSTRUCTURE The microstructure shall consist of a continuous skeletal network of Molybdenum - Chromium - Tungsten - Vanadium carbides. The matrix will have a fine dispersion of spherodized Chromium - Molybd
6、enum - Tungsten - Iron Carbides which can be detected at 500/1000X magnification. 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.
