1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions Rev 02 2011 12 15 N Status No usage S. Ryzyi, NA 2003 03 12 Revised Para 3.0 inserted; para 3.1, 3.6 (should have been 3.7) and 4 deleted 1993 06 23 C10312718 Released W. Janssen EAO, J.C. Webster NAAO Contr
2、olled document at www.MATS Page 1 of 3 Copyright 2011, Ford Global Technologies, Inc. NODULAR IRON, PISTON RINGS, ALLOYED WSD-M1A300-A3 NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a alloyed nodular iron, with a well tempered martensitic matrix. 2. APPLICATION
3、 This specification was released originally for materials used in the production of piston rings. 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
4、 CHEMICAL COMPOSITION (weight %, ladle analysis) Carbon (total) 3.10 - 3.70 Silicon 2.00 - 2.60 Phosphorus max 0.10 Sulphur max 0.05 Chromium 0.15 - 0.35 Manganese 0.60 - 0.90 Molybdenum 0.15 - 0.35 Nickel 0.70 - 1.10 Magnesium 0.02 - 0.07 Carbon equivalent and alloying elements shall be controlled
5、within the above range to accommodate the ring section, size and method of casting (static/centrifugal are acceptable). The anticipated working range for each component shall be restricted to a limited band within the above. ENGINEERING MATERIAL SPECIFICATION WSD-M1A300-A3 Page 2 of 3 Copyright 2011
6、, Ford Global Technologies, Inc. 3.3 HARDNESS (ASTM E 18) The hardness of the finished ring shall be 100 - 108 HRB. These readings to be taken (1) adjacent to the gap, (2) 90 degrees to the gap and (3) opposite the gap on the flat side of the rings. An average of these three hardness readings is req
7、uired to determine the hardness value of a tested ring. Any other position will be within 2 Rockwell B. 3.4 MICROSTRUCTURE (ASTM A 247) Graphite: Uniformly distributed nodules (ASTM A 247), form I and II, 90 % min. Matrix: Tempered martensite. Massive carbides shall not exceed 5 % in any field viewe
8、d at 100X. No free ferrite is allowable. 3.5 QUALITY The castings shall be of high quality nodular iron and must be uniform throughout as to composition and mechanical properties. They shall be free from porosity, blowholes, chilled areas or any other physical imperfections detrimental to the fabric
9、ation and/or performance of the component. 3.6 TRANSVERSE STRENGTH, min 960 MPa (Unless otherwise stated on the drawing) The transverse strength shall be calculated as follows: 3 L (D/t-1) _ TS = MPa w t L = Load newtons applied by parallel flat plates in a direction perpendicular to the axis of sym
10、metry passing through the back of ring, sufficient to break the ring. D = Nominal ring diameter, mm. t = Radial wall thickness at the back of the ring, mm. w = Width at the back of the ring, mm. ENGINEERING MATERIAL SPECIFICATION WSD-M1A300-A3 Page 3 of 3 Copyright 2011, Ford Global Technologies, In
11、c. 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 TRANSVERSE MODULUS OF ELASTICITY 150 - 190 GPa The modulus of elasticity shall be calculated as follows: 6.46 Tcd D3 E = _ for rectangular cross s
12、ection G wt3 E = Modules of elasticity, MPa Tcd = Load (newtons) applied by parallel flat plates in a direction perpendicular to the axis of symmetry passing through the back of the ring, sufficient to close the ring to the nominal ring diameter. G = Ring free gap, mm, measured at the O.D. of the ring on base of the O.D. chamfer. D,t,w = As defined in the transverse rupture strength formula.
