1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions Rev 02 2011 12 15 N Status A1/2 No usage S. Ryzyi, NA 2002 09 24 Revised Updated and renumbered 1989 06 01 SM/ER3036TC Released R Cooper/N Riley, EAO C.A. McKenney, NAAO Controlled document at www.MATS Page
2、1 of 2 Copyright 2011, Ford Global Technologies, Inc. NODULAR IRON - PISTON RINGS, (PEARLITIC) WSD-M1A300-A1 NODULAR IRON - PISTON RINGS, (ACICULAR) WSD-M1A300-A2 NOT TO BE USED FOR NEW DESIGN 1. SCOPE The materials defined by these specifications are nodular graphite irons, with a pearlitic or acic
3、ular (martensitic and lower bainitic transformation products) matrix. Cast statically: single/twins, or centrifugally. 2. APPLICATION These specifications were released originally for materials used in the production of piston rings. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS
4、 Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION (weight %, ladle analysis) Carbon (total) 2.5 - 4.1 Phosphorus 0.5 max Manganese 1.0 max Nickel 2.0 max Sulphur 0.05 max Silicon - adjusted to
5、 suit the casting method, extreme ranges A1 = 3.5 - 5.5 %, A2 = 2.0 - 3.4 %. Chromium and Molybdenum can be added to a maximum of 1.0 % of each element, Vanadium 0.5 % maximum and Copper 1.5 % maximum. Carbon equivalent and alloying elements shall be controlled within the above range to accommodate
6、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-A1/A2 Page 2 of 2 Copyright 2011, Ford Global Technologies, Inc. 3.
7、3 HARDNESS A1 220 - 322 HB 18 - 34.5 HRC 97 - 110 HRB A2 250 - 430 HB 25 - 43 HRC 100 - 112 HRB The hardness shall be restricted to a limited band within the above range as part of the Control Plan. An average of three results taken (1) adjacent to the gap, (2) 90 to the gap and (3) opposite the gap
8、 Any other position will be within 10 HB points, 2 Rockwell C or B points. In cases of dispute, the umpire test method will be HB. 3.4 MICROSTRUCTURE A1 Graphite - uniformly distributed nodules ASTM A 247, form I and II, 90 % minimum. Matrix - Predominantly ferrite, with fine lamellar pearlite up t
9、o a maximum of 40 % by area. Complex alloy carbides if present shall be as small isolated particles to a maximum of 5 % by area. A2 Graphite - as A1. Matrix - Tempered martensite and lower bainite with carbides limited as in A1. 3.5 SKIN STRESS, min (unless otherwise stated on the drawing). (BS 5341
10、) A1 and A2 1.1 Gpa 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. 4.1 MODULUS OF ELASTICITY, Nominal (BS.5341 part 4) A1 and A2 160 GPa Note: The actual values of modulus are adjusted to match the individual requirements of each ring design.
