1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions Rev 03 2011 12 15 N Status A4/A6/A7 No Usage S. Ryzyi, NA 2002 10 09 Revised Updated and renumbered 1993 06 23 C10312721 Released Janssen EAO J.C. Webster NAAO Controlled document at www.MATS Page 1 of 3 Cop
2、yright 2011, Ford Global Technologies, Inc. GREY CAST IRON, PISTON RINGS, ALLOYED NOT FOR NEW DESIGN WSD-M1A301-A4 GREY CAST IRON, PISTON RINGS, ALLOYED WSD-M1A301-A5 GREY CAST IRON, PISTON RINGS, ALLOYEDNOT FOR NEW DESIGN WSD-M1A301-A6 GREY CAST IRON, PISTON RINGS, ALLOYEDNOT FOR NEW DESIGN WSD-M1A
3、301-A7 1. SCOPE The material defined by this specification is a high alloyed iron, with specified microstructures. 2. APPLICATION This specification was released originally for materials used in the production of piston rings. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Materi
4、al suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION (weight %, ladle analysis) A4 A5 A6 A7 Carbon (total) 3.10-3.50 2.50-3.30 3.20-3.80 3.00-3.40 Silicon 1.90-2.50 3.60-4.60 2.20-3.20 1.90-2.50 Phospho
5、rus 0.30 max 0.35 max 0.20-0.50 0.25-0.45 Sulphur 0.15 max 0.15 max 0.10 max 0.10 max Chromium 0.25-0.55 0.20-0.60 0.30-0.70 0.20-0.40 Vanadium 0.10-0.30 0.30-0.70 0.10-0.30 - Manganese 0.60-0.90 0.80-1.20 0.50-0.80 0.40-0.80 Copper 0.90-1.30 0.50-1.00 0.80-1.20 0.75-1.25 Nickel 2.00-2.40 0.50-1.00
6、0.30-0.80 - Molybdenum 0.80-1.20 0.50-1.00 0.50-1.30 0.75-1.25 Titanium - 0.10-0.30 - - Tungsten - 0.80-1.20 - - Niobium - 0.10-0.40 - - Carbon equivalent and alloying elements shall be controlled within the above range to accommodate the ring section, size and method of casting (static/centrifugal
7、are acceptable). The anticipated working range for each component shall be restricted to a limited band within the above. 3.3 HARDNESS (ISO 6506, ASTM E 18) ENGINEERING MATERIAL SPECIFICATION WSD-M1A301-A4/A7 Page 2 of 3 Copyright 2011, Ford Global Technologies, Inc. A4 A5 A6 A7 HB - 350 - 470 - - H
8、RC 28 - 38 - 30 - 42 - HRB - 109 - 116 106 - 114 103 - 111 HRD - - - 45 - 53 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 will be within 10 HB points, 2 Rockwell B, or C, or D points. 3.4 MICROSTRUCTURE (ASTM A 247)
9、A4/A5 Graphite: Primary graphite (ASTM A 247) Form VII types A and B; size 5 and finer. Type C is not permitted. Matrix: Fine grained tempered martensite or bainite with a uniform distribution of fine isolated carbide particles. A6 Graphite: Shall be predominently Type A and B flakes, size 5 to 8. S
10、mall amounts of Type D and E graphite are permissible but shall be held to a minimum. Matrix: Shall consist of an acicular structure and/or partially spheroidized pearlite. Free ferrite or massive carbides shall be held to a maximum of 5 % of any field viewed at 100x. The steadite constituent shall
11、be uniformly distributed as non- massive particles. Chemical composition shall be secondary to microstructure and physical properties for acceptance or rejection. The castings shall be heat treated for a minimum of one hour at a temperature of between 580 and 630 C. The actual temperature shall be s
12、uch that the hardness requirements are met. A7 Graphite: Shall consist of predominantly AFS types D/E with an inter-mixture of random forms A/B, size 5 and finer. Matrix: Shall be composed of close grained martensite. There shall be free ferrite present. Carbides, if present, shall be uniformly dist
13、ributed, non-massive and shall not exceed 5 % of any field at 100 diameter magnification. Steadite shall be well distributed in a broken non-continuous network. ENGINEERING MATERIAL SPECIFICATION WSD-M1A301-A4/A7 Page 3 of 3 Copyright 2011, Ford Global Technologies, Inc. 3.5 TRANSVERSE STRENGTH, min
14、 Unless otherwise stated on the drawing A4 517 MPa A5 650 MPa A6 483 MPa A7 440 MPa 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 symmetry passing through the back of
15、 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. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of the specification. 4.1 MODULUS OF ELASTICITY, nominal (ISO 6621/2) WSD-M1A301-A4 110 - 145 GPa WSD-M1A301-A5 130 - 160 GPa WSD-M1A301-A6 96 - 124 GPa WSD-M1A301-A7 132 GPa min NOTE: The actual values of modulus are adjusted to match the individual requirements of each ring design.
