1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2002 09 25 Revised Updated and renumbered 1979 01 10 Metricated and Retyped CAH2-823385 1963 06 05 Released AS1-915 Printed copies are uncontrolled Page 1 of 2 Copyright 2002, Ford Global Technologies, Inc.
2、STEEL TUBING - TERNE COATED ESA-M1A193-A 1. SCOPE The material defined by this specification is a low carbon steel tubing, completely coated on the inside and outside with a terne alloy or a lead-tin composition applied by the hot dip process. 2. APPLICATION This specification was released originall
3、y for materials used for fuel filler pipes and fuel vent tubes. 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-M99P1111-A). 3.2 BASE METAL The base metal shall b
4、e an uncoated low carbon steel tubing, capable of carrying a liquid. 3.3 TERNE COATING Continuity and uniformity of the hot dip lead tin coating is of primary importance since pitting and corrosion of the base metal is objectionable. The quality of the terne coating shall be controlled by the follow
5、ing: 3.3.1 Coating Uniformity While no specific values of weight or thickness are specified, the coating must be uniform in thickness, and free of runs, drips or surface coating irregularities which affect function or performance. 3.3.2 Coating Porosity Density Parts for testing may be sectioned int
6、o convenient lengths, so that inside and outside surfaces can be inspected. Thoroughly clean (preferably vapor degrease with trichloro-ethylene) and totally immerse, vertically if possible in a nonagitated solution of distilled water pH 6-6.5 and maintain at a temperature of 93 +/- 2 C for a period
7、of six hours +/- 15 minutes. Parts with I.D. surfaces not readily visible shall be sectioned after immersion and visually examined. ENGINEERING MATERIAL SPECIFICATION ESA-M1A193-A Page 2 of 2 Copyright 2002, Ford Global Technologies, Inc. Method of Evaluation: Both inside and outside surfaces shall be visually examined upon completion of the test for the maximum amount of porosity (red rust spots) present per sq. in (645 mm2). No sq. in (645 mm2) area shall contain more than 30 spots. No single spot shall be larger than 1/16 in (1.6 mm) in diameter.
