1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2002 09 30 Revised Updated and renumbered 1988 02 08 SM/ER 2286 TC Released. N.P. Riley. EAO. Printed copies are uncontrolled Page 1 of 3 Copyright 2002, Ford Global Technologies, Inc. GREY IRON - PISTON RIN
2、GS (PEARLITIC) WSD-M1A301-A1 GREY IRON - PISTON RINGS (ACICULAR) WSD-M1A301-A2 GREY IRON - PISTON RINGS (ACICULAR) WSD-M1A301-A3 1. SCOPE The materials defined by this specification are flake graphite irons, with an acicular or pearlitic matrix; cast statically as single/twins, or centrifugally. 2.
3、APPLICATION This specification was released originally for materials used in the production of piston rings. 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-M99P1
4、111-A). 3.2 CHEMICAL COMPOSITION (weight %, ladle analysis) A1 A2 A3 Carbon (total)* 3.4 - 4.0 3.4 - 4.0 2.5 - 3.5 Silicon* 1.5 - 3.1 1.5 - 3.1 1.5 - 3.1 Phosphorus 0.3 - 0.8 0.3 - 0.8 0.5 max Sulphur 0.15 max 0.15 max 0.15 max Chromium 0.6 max 0.5 max 0.2 - 1.0 Copper 1.5 max 0.5 - 2.5 1.5 max Note
5、 The Silicon content shall be adjusted to suit the casting method. Manganese, Nickel and Molybdenum can be added to a maximum of 1.0% each, vanadium 0.6% maximum. Note: Manganese must be present in sufficient quantity to balance the sulphur i.e. ( 1.7 x S% ) + 0.2 min. ENGINEERING MATERIAL SPECIFIC
6、ATION WSD-M1A301-A1/A3 Page 2 of 3 Copyright 2002, Ford Global Technologies, Inc. Carbon equivalent (*) and alloying elements shall be controlled within the above range to accommodate the ring section, size and method of casting (static/centrifugal are acceptable). The anticipated working range for
7、each component shall be restricted to a limited band within the above. 3.3 HARDNESS (ISO 6506 ; ISO 80) A1 A2 A3 HB 190 300 255 350 245 - 360 HRB 94 107 102 114 100 - 117 An average of three results taken (1) adjacent to the gap (2) 90 degrees to the gap and (3) opposite the gap. Any other position
8、will be within 10 HB or 2 Rockwell B points. In the case of dispute the umpire test method will be HB. 3.4 MICROSTRUCTURE Graphite - uniformally distributed flakes ASTM A 247 form VII type A size 5-8 and type B (rosette) types D and E to be avoided or kept below 5% (area). Matrix - A1 - fine lamella
9、r pearlite with phosphide constituent present as small isolated particles or a discontinuous network. Ferrite shall not exceed 10% when averaged over a field of 2mm diameter minimum. Matrix - A2 and A3 - Acicular ie tempered martensites and bainites with complex alloy carbides where appropriate pres
10、ent as small isolated particles below 10% of matrix volume. 3.5 BENDING STRENGTH (unless otherwise stated on drawing) (BS 5341 or equivalent ISO) A1 340 MPa min A2 and A3 450 MPa min 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requir
11、ements of this specification. 4.1 MODULUS OF ELASTICITY (ISO 6621/2) A1 95 GPa nominal A2 100 GP “ A3 115 GPa Note: The actual values of modulus are adjusted to match the individual requirements of each ring design. ENGINEERING MATERIAL SPECIFICATION WSD-M1A301-A1/A3 Page 3 of 3 Copyright 2002, Ford
12、 Global Technologies, Inc. 4.2 BENDING STRENGTH (BS 5341) In the absence of a complete ring a measure of Bending Strength can be obtained by the skin stress test as defined in BS 5341, in which the span may be adjusted to optimize the test for each specific ring geometry. A1 430 MPa min A2 and A3 550 MPa min
