1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 3 2015 06 12 Revised See Summary of Revisions T. Covert, NA 2002 11 14 Revised Rev para 4.1 with Cr6+ free statement and 3.2 B. Burnside 1984 06 13 CEO2-610178-C Released K.Gribble Controlled document at www.MATS Copyright 2015, Ford Glo
2、bal Technologies, Inc. Page 1 of 2 STEEL TUBING - ZINC/ALUMINUM COATED ESA-M1A270-A 1. SCOPE The material defined by this specification is a hot dipped zinc/aluminum alloy coated low carbon steel tube. 2. APPLICATION This specification was released originally to provide corrosion protection for low
3、carbon steel tubing for use in transmission oil cooler lines. Used with a second sacrificial or barrier layer, it continues to be used for brake lines, fuel lines, hydraulic power steering lines, and transmission oil cooler lines. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Ma
4、terial suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 BASE MATERIAL The base material shall be low carbon steel butt welded tube which conforms to one of the following specifications: . SAE J526 - Welded Low Carbon Steel
5、 Tubing . SAE J527 Brazed Double Wall Low-Carbon Steel Tubing 3.3 COATING COMPOSITION The tube shall be coated with a zinc 5 % aluminum-Mischmetal alloy per ASTM B750. 3.4 COATING ADHESION There shall be no chipping away of the coating from the steel tube when the coating is scratched with a knife b
6、lade held at an angle of 90 to the surface. 3.5 COATING COVERAGE The external surface of the tube shall have no uncoated areas. The lack of coating on the tube shall be determined by the following test. Test Method: Apply a 5 % solution of copper sulfate and distilled water to a section of tubing ap
7、proximately 300 mm in length by wiping with a cotton swab. Allow the tube to stand for 30 s minimum. The development of a copper color on the tube surface indicates the absence of coating and shall constitute a failure. 3.6 COATING WEIGHT 36 g/m2 min or (ASTM A 90) 5 m thickness min 6.83 g/m2 coatin
8、g weight = 1.00 m coating thickness ENGINEERING MATERIAL SPECIFICATION ESA-M1A270-A Page 2 of 2 Copyright 2015, Ford Global Technologies, Inc. 3.7 CORROSION RESISTANCE 360 h min (FLTM BI 103-01, ASTM D610) The tube must show no more than 1 % red rust over any 25.4 mm length when compared to ASTM D61
9、0, Plate No. 6. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. Contact for questions concerning Engineering Material Specifications. 4.1 ZINC/ALUMINUM COATED STEEL TUBE (used with a top coating for a
10、ll applications.) For brake and fuel lines with a polymer coating read WSS-M21P30-A1. For hydraulic steering and transmission lines with aluminum rich paint read WSS-M21P26-A. 5 SUMMARY OF REVISIONS 2015 05 21 Revised Added details to application section. Added coating thickness to coating weight in 3.6. Reformatted and removed Special Finishes 4.1. Added referencing specs to 4.1. 2002 11 14 Revised Rev para 4.1 with Cr6+ free statement and 3.2 2002 09 24 Revised Updated and renumbered 1987 02 26 RD-165900-C6 Revised
