1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions Rev 02 2011 12 15 N Status No Usage S. Ryzyi, NA 2002 07 16 Revised Updated and renumbered 1979 11 07 Released DR832871 Controlled document at www.MATS Page 1 of 2 Copyright 2011, Ford Global Technologies, I
2、nc. STEEL SHEET, ALUMINUM - ZINC - SILICON ALLOY COATED ESL-M1A246-A NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a low carbon steel sheet coated with an aluminum-zinc-silicon alloy by a continuous hot dipping process. 2. APPLICATION This specification was rel
3、eased originally for material used in the manufacturing of components, such as heat shields, grass shields, and muffler wraps where improvements in corrosion, temperature oxidation resistance, and heat reflectivity are necessary over standard galvanized steel. It is typically available in cold rolle
4、d thicknesses from about 0.016 in (0.40 mm) to 0.074 in (1.90 mm). The thickness is the total of the base metal and coating. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Mate
5、rials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION OF BASE MATERIAL (ASTM A 568 or SAE J 409) Ladle Analysis Carbon 0.15 max Manganese 0.30 - 0.90 Phosphorus 0.030 max Sulfur 0.030 max 3.3 CHEMICAL COMPOSITION OF COATING Aluminum 51.0 - 58.0 Zinc 40.0 - 48.0 Silicon 1.0 - 2.0 ENGINEERING MATERIAL SPEC
6、IFICATION ESL-M1A246-A Page 2 of 2 Copyright 2011, Ford Global Technologies, Inc. 3.4 COATING THICKNESS, min 0.00050 in(12.7 micrometer) Test Method A metallographic technique should be used to calibrate any eddy current thickness measuring instrument and must be used when determining the coating th
7、ickness on formed parts. Coating thickness across the sheet, not less than 2 in (50 mm) from the sides and 4 in (100 mm) from the ends, shall meet the above requirement. 3.5 COATING WEIGHT (ASTM A 428) 0.32 oz/ft2 (98 g/m2) min - single spot test 0.36 oz/ft2 (110 g/m2) min - triple spot test Test Me
8、thod A “single spot“ is the average of three readings in an area 2 1/4 in x 2 1/4 in (57 mm x 57 mm). A “triple spot“ is the average of three “single spots“ with one measurement being taken at diagonally opposite corners within the boundary formed by lines not less than 2 in (50 mm) from the sides a
9、nd 4 in (100 mm) from the ends. 3.6 COATING BEND TEST (ASTM A 525) The coated steel shall pass the coating bend test portion of the above standard without flaking. 3.7 SALT SPRAY, min 2000 h (ASTM B 117) Flat stock specimens shall be considered to fail in the salt spray test if the coatings have mor
10、e than six rust spots visible to the unaided eye for any square foot (930 cm2) or any rust spot larger than 1/16 in (1.6 mm) in diameter at the end of the specified period. 3.8 WELDABILITY (FLTM BA 113-01) In addition to conforming to the above requirement, the material must exhibit good weldability
11、 for the intended application using any of the conventional processes. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. Yield Strength 38 000 - 53 000 psi (262 - 366 MPa) Tensile Strength 50 000 - 65 000 psi (345 - 449 MPa) Elongation 20 - 36 % Hardness Rockwell “B“ 50 - 65
