1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions Rev 03 2011 12 16 N Status No Usage S. Ryzyi, NA 2002 09 27 Revised Updated and renumbered 1963 09 10 E7-2783 Released Copyright 2011, Ford Global Technologies, Inc. Controlled document at www.MATS Page 1 of
2、 2 PISTON RING - GRAY IRON (V ALLOY) ESE-M1A23-A NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a vanadium alloy gray iron. 2. APPLICATION This specification was released originally for material used in the manufacture of piston rings. 3. REQUIREMENTS 3.1 STANDA
3、RD 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 (Optional) Twin Casting Cuff Casting Total Carbon 3.50 - 3.90 3.20 - 3.60 Silicon 2.60 - 3.10 2.10 - 2
4、60 Manganese 0.55 - 0.70 0.55 - 0.80 Phosphorus 0.40 - 0.70 0.15 - 0.40 Sulfur 0.10 max 0.13 max Vanadium 0.05 - 0.15 0.10 - 0.30 Chromium 0.08 - 0.30 0.08 - 0.30 Copper - 0.30 - 0.75 Piston rings may be produced by either twin casting (2 rings) or cuff casting (multiple rings). It is not intended
5、that the supplier use both processes and analyses concurrently, he is expected to confine himself to one process and analysis for a given part or production run. 3.3 HARDNESS-ROCKWELL B 95 - 106 (Finished ring) 94 - 104 (ASTM D 18) Average of 3 determinations on each part, with individual determinat
6、ion no more than 2 points below minimum specified. ENGINEERING MATERIAL SPECIFICATION ESE-M1A23-A Page 2 of 2 Copyright 2011, Ford Global Technologies, Inc. 3.4 QUALITY The quality of the rings shall be such that they shall be free from cracks, blow holes, shrinkage, chilled areas or other imperfect
7、ions which shall be detrimental to the function of the part. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. Twin Casting Cuff Casting 4.1 TENSILE STRENGTH, min 310 MPa 275 MPa 4.2 MODULUS OF ELASTICIT
8、Y 86 000 - 103 000 MPa 4.3 MICROSTRUCTURE The following microstructure has been found most suitable. The indicated microstructure is not to be used as a basis for rejection; however, it can be used to support functional rejection. The graphite shall be evenly distributed and present for the most par
9、t in the form of randomly oriented types “A“ and “B“ with small amounts of type “D“ permitted. The matrix shall be essentially fine pearlite with no appreciable amount of massive cementite. The phosphorous constituent (steadite) is present as a mesh or network structure throughout the section and shall be evenly distributed.
