1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 03 2012 03 06 N Status No replacement or usage G. Weber, NA 2003 10 15 Revised Para 3.0 inserted; para 3.1, 3.7 and 4 deleted 1989 09 12 NE01E10000474054 Release J. C. Webster NAAO, N. Riley EAO Controlled document at www.MATS Copyright 2
2、012, Ford Global Technologies, Inc. Page 1 of 2 SINTERED IRON - MOLYBDENUM STEEL WSE-M10A89-A NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a sintered and heat treated molybdenum steel. 2. APPLICATION This specification was released originally for intake valve
3、seat inserts for internal combustion engines. 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 CHEMICAL COMPOSITION (weight %) (ASTM A 751/ASTM E
4、1019/ASTM A 484) Total Carbon 0.55 - 0.90 Combined Carbon 0.45 - 0.90 Molybdenum 0.65 - 0.85 Manganese 0.20 - 0.45 Copper 1.50 - 2.50 Nickel 0.35 - 0.55 Magnesium 0.10 - 0.20 Sulfur 0.05 max Phosphorus 0.05 max Other 2.0 max Iron Balance 3.3 DENSITY, g/cm3 6.7 min (ISO 2738/ASTM B 328) 3.4 HARDNESS
5、ASTM E 18/ISO 4498) 3.4.1 Apparent Hardness 90 - 105 HRB (average of minimum of five readings made on flat surface of lower face). 3.4.2 Microhardness (ASTM E 384) (50 g load, average of minimum of five readings taken on a traverse perpendicular to the seat face to a depth of 1.5 mm) Alloy Phase 40
6、0 - 650 Knoop (other than ferrite particles) ENGINEERING MATERIAL SPECIFICATION WSE-M10A89-A Copyright 2012, Ford Global Technologies, Inc. Page 2 of 2 3.5 MICROSTRUCTURE (ASTM E 3/ASTM E 562) The microstructure shall consist of a uniform mixture of pearlite, bainite, ferrite, tempered martensite, a
7、nd an inorganic solid lubricant. Ferrite shall not exceed 10% of the area of any radial cross section. The area fraction of inorganic solid lubricant shall constitute 2.0% to 4.0% of any radial cross section. Internal voids shall not exceed .25 mm in any dimension when cross sections are examined in the unetched condition. 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 the aid of magnification.
