1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions Rev 03 2011 12 15 N Status No Usage S. Ryzyi, NA 2002 07 23 Revised Updated and renumbered 1979 05 18 Released R#5-4/CH8H-RD834180 Controlled document at www.MATS Page 1 of 3 Copyright 2011, Ford Global Tech
2、nologies, Inc. STEEL - HIGH CARBON - FLAPPER VALVE ESH-M1A251-A NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a high carbon steel strip, hardened and tempered, having strict requirements for surface finish, flatness and thickness. 2. APPLICATION This specificat
3、ion was released originally for material used as flapper or reed valves in automotive air conditioning compressors. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WS
4、S-M99P1111-A). 3.2 CHEMICAL COMPOSITION, (WT %) Carbon 0.95 - 1.05 Manganese 0.25 - 0.55 Phosphorus 0.03 max Sulfur 0.02 max Silicon 0.10 - 0.35 3.3 MICROSTRUCTURE The material shall have a microstructure of uniform tempered martensite, with a maximum of 6 % spherical undissolved carbides, determine
5、d by linear analysis. Decarburization (SAE J419, Type 3) shall not exceed 6 % of strip thickness. The entire decarburized zone must not be martensitic. ENGINEERING MATERIAL SPECIFICATION ESH-M1A251-A Page 2 of 3 Copyright 2011, Ford Global Technologies, Inc. 3.4 MECHANICAL PROPERTIES Thickness Tensi
6、le Strength Hardness, DPH in mm ksi MPa (Reference Only) 0.005 0.127 284/313 1960/2160 605 0.006 0.152 284/313 1960/2160 605 0.008 0.203 277/306 1910/2110 590 0.010 0.254 270/299 1860/2060 580 0.012 0.305 263/292 1810/2010 565 0.015 0.381 255/284 1760/1960 550 0.016 0.406 255/284 1760/1960 550 0.018
7、 0.457 248/277 1710/1910 540 0.020 0.508 242/271 1670/1870 525 0.025 0.635 235/264 1620/1820 510 0.028 0.711 235/264 1620/1820 510 0.035 0.889 228/257 1570/1770 500 3.5 FLATNESS Flatness deviation shall not exceed 0.2 % (0.002 in/in or 0.002 mm/mm) of the nominal strip width and length. 3.6 SURFACE
8、FINISH The strip surface shall be bright polished with no scratches, laps, roll marks, or other defects which could be potential fracture initiation sites. Small defects with smooth or rounded borders will be accepted. The maximum surface roughness shall conform to the following: Thickness 0.005 to
9、0.015 in (0.127 to 0.381 mm) 6 in (0.15 m) AA 0.016 to 0.035 in (0.406 to 0.889 mm) 12 in (0.30 m) AA The instrument shall have a roughness width cutoff of 0.030 in (0.75 mm). ENGINEERING MATERIAL SPECIFICATION ESH-M1A251-A Page 3 of 3 Copyright 2011, Ford Global Technologies, Inc. 3.7 STRIP THICKNE
10、SS Nominal Tolerance, plus or minus in mm in mm 0.005 0.127 0.00024 0.006 0.006 0.152 0.00024 0.006 0.008 0.203 0.00031 0.008 0.010 0.254 0.00035 0.009 0.012 0.305 0.00035 0.009 0.015 0.381 0.00043 0.011 0.016 0.406 0.00047 0.012 0.018 0.457 0.00047 0.012 0.020 0.508 0.00055 0.014 0.025 0.635 0.00091 0.023 0.028 0.711 0.00091 0.023 0.035 0.889 0.00106 0.027
