1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions Rev 03 2014 12 01 N Status Replaced by Industry Standards G. Weber, NA 2002 09 30 Revised Updated and renumbered 1963 06 05 Released AS1 #915 Page 1 of 3 Copyright 2014, Ford Global Technologies, Inc. STEEL,
2、 RUSTLESS DECORATIVE AND FINISHED ESB-M1A70-A PRODUCTS - IMPROVED CORROSION RESISTANCE NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a ferritic chromium stainless steel having improved corrosion resistance, and improved drawing or forming properties to make the
3、 part and when given an appropriate finish, shall retain such finish under service conditions. 2. APPLICATION This specification was released originally for the manufacture of decorative trim moldings, grille components and similar items. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATE
4、RIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION Carbon 0.08 max Chromium 16.00 - 20.00 Nickel 0.50 max Manganese 1.00 max Silicon 0.75 max Phosphorus 0.04 max Sulfur 0.03 max Molybdenum
5、 0.75min(0.90-1.10)preferred To meet the requirements of this specification, the following additional elements or combinations thereof may be used provided they meet the specified analysis limitations. Vanadium 0.50 max Columbium 0.50 max Titanium 0.50 max ENGINEERING MATERIAL SPECIFICATION ESB-M1A7
6、0-A Page 2 of 3 3.3 MECHANICAL PROPERTIES (ASTM E 8) 3.3.1 Yield Strength, max 65,000 psi (448 MPa) 3.3.2 Tensile Strength, min 70,000 psi (483 MPa) 3.3.3 Elongation, min 22% 3.3.4 Hardness, Rockwell 30T, max 74 3.3.5 Rope and Grain Size Rating If manufacturing operations make rope and grain size ra
7、tings necessary to meet final part acceptance standards, they shall be determined in accordance with FLTM BA 12-1. 3.4 SURFACE FINISH (FLTM BQ 6-3) Materials supplied to this specification shall be uniform in quality, clean, sound, smooth, not to exceed 10 RMS micro-inch finish and free from defects
8、 detrimental to performance in fabrication, corrosion resistance and appearance of part for which it is intended. The surface quality shall be such that the material can be buffed to a finish and luster to meet visual acceptance standards using standard buffing equipment. Material to be prebuffed, b
9、right anneal or bright anneal acid passivated to minimum surface quality. 3.5 CORROSION RESISTANCE - AS RECEIVED FROM THE MILL (FLTM BQ 105-01) The material requirement under this specification shall have been give sufficient final pickling and passivation treatment to obtain acceptable corrosion re
10、sistance. Material as received and given no further preparation shall not show signs of failure by red rust, pits, or etching type corrosion, beyond that tabulated below, when subjected to the CASS Test (Copper Acetic Acid Salt Spray Test) for a period of 16 hours. Table I Permissible Surface Corros
11、ion Allowed After 16 Hour CASS Test Rating Number % Surface Attack Acceptable Not Acceptable 1 0 - 2 X 2 2 - 5 * 3 5 - 15 * 4 15 - 25 X 5 25 - 35 X 6 Over 35 X *Material in this rating may be buffed using one buffing pass and retested. (See FLTM BQ 6-3). If on retest the material meets Rating #1, th
12、e material shall be acceptable. ENGINEERING MATERIAL SPECIFICATION ESB-M1A70-A Page 3 of 3 3.6 CORROSION RESISTANCE Buffed samples: Samples of flat sheet when buffed to a sufficient finish and luster to match the master visual inspection samples or samples approved by the affected Product Engineerin
13、g Office shall meet rating 1 as shown in Table I under paragraph 3.4, Corrosion Resistance. 3.7 FINISHED PRODUCTS 3.7.1 Finished Products - Surface Finish Finished products shall have been buffed by an appropriate method, either by hand or mechanical means and with proper wheels, belts and compounds
14、 as required to produce the required surface finish and luster on significant surfaces to meet the master visual inspection sample part or parts approved by the affected Product Engineering Office and to provide specified corrosion resistance. Mitered joints (Example: glass window frame) shall be we
15、lded to provide a non-porous surface, when buffed shall provide a corrosion resistant finish, and meet the master visual acceptance standard. 3.7.2 Corrosion Resistance - Finished Products Significant surfaces of finished parts shall meet the corrosion resistance requirements for red rust, pits and
16、etching type corrosion as shown in Table I under paragraph 3.4 as follows: Exterior parts Rating No. 1 Interior parts Rating No. 2 3.7.3 Significant Surfaces Significant surface are those surfaces which in assembly are visible and subjected to wear or corrosion or both. Sheared or slit edges are excepted from the term significant surfaces unless specifically noted on the Engineering Drawing in which case they are to be buffed for corrosion resistance.
