1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Changes 1999 11 22 N - Status Replaced by WSD - M1A333 - A2 1991 07 05 NB00I10043054105 Released J.Nelson NAAO K.Thurgood EAO WP 3948 - a Page 1 of 3 STEEL, COLD ROLLED, LOW CARBON SHEET WSB - M1A250 - B1 NOT TO BE US
2、ED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a cold rolled low carbon (CRLC) sheet steel. 2. APPLICATION This specification was released originally for visi ble exterior body panels. 3. REQUIREMENTS 3.1 STATISTICAL PROCESS Suppliers must conform to the requirements of For
3、d Quality System Standard Q -101. A mutually acceptable Control Plan as described therein is required for material/source approval. Appropriate statistical tools must be used to analyze process/product data so that variation in the final product is continuously reduced. 3.2 CHEMICAL COMPOSITION The
4、percentage given are heat or cast (ladle) analysis. Carbon 0.09 max Manganes e 0.50 max Phosphorus 0.025 max Sulphur 0.025 max 3.3 FORMABILITY The quality level of steel supplied to fabricate a specific component is to be negotiated between the manufacturing activity and the steel supplier. Acceptan
5、ce of subsequent orders by the steel supplier for a given component at the agreed upon quality level implies that all steel supplied will form that part satisfactorily as defined by the manufacturing activity. ENGINEERING MATERIAL SPECIFICATION WSB - M1A250 - B1 WP 3948 - b Page 2 of 3 3.4 Paintabil
6、ity Material supplied to this specificat ion must have prior approval for paintability by the responsible Materials Engineering activity. This approval shall be based on samples prepared to the local process and resistance requirements appropriate to the country of Ford vehicle manufacture, or to th
7、e relevant Engineering Performance Specification, see section 5.1. 3.6 SUPPLIERS RESPONSIBILITY All materials supplied to this specification must be equivalent in all characteristics to the material upon which approval was originally granted. P rior to making any change in the properties, compositio
8、n, construction, color, processing or labeling of the material originally approved under this specification, whether or not such changes affect the materials ability to meet the specification requirements, the Supplier shall notify Purchasing, Toxicology and the affected Materials Engineering activi
9、ty of the proposed changes and obtain the written approval of the Materials Engineering activity. Test data, test samples and a new code identification a re to be submitted with the request. Substance restrictions imposed by law, regulations or Ford, apply to the materials addressed by this document
10、 The restrictions are defined in Engineering Material Specification WSS - M99P9999 - A1, unless a different suffix (e.g., A2 or A3) is specified on the engineering document for the application. 4. APPROVAL OF MATERIALS Materials defined by this specification must have prior approval by the responsi
11、ble Materials Engineering activity. Suppliers desiring approva l of their materials shall first obtain an expression of interest from the affected Purchasing, Design and Materials Engineering activity. Upon request, the Supplier shall submit to the affected Materials Engineering activity a completed
12、 copy of their laboratory test reports, signed by a qualified and authorized representative of the test facility, demonstrating full compliance with all the requirements of this specification (test results, not nominal values), the material designation and code number, and test specimens for Ford ev
13、aluation. Fords engineering approval of a material will be based on its performance to this specification and on an assessment of suitability for intended processes and/or applications. Upon approval, the material will be added to the Engineering Material Approved Source List. ENGINEERING MATERIAL S
14、PECIFICATION WSB - M1A250 - B1 WP 3948 - b Page 3 of 3 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 PAINTABILITY TEST METHODS Material supplied to European Automotive Operations (EAO) shall meet
15、 the requirements of WSK - M2P136 - A. Material supplied to North American Automotive Operations (NAAO) shall meet the following requirements: . Material intended for class 1 surface applications shall meet the requirements of ESB - M2P130. . Material intended for class 2 and 3 surface applications
16、shall meet the requirements of ESB - M2P129. A Class 1 surface shall be specified for parts of the body or front end sheet metal that are exposed after paint o r trim. A Class 2 surface shall be specified for parts of the body not covered by trim materials but exposed to view when the car doors or enclosure lids are in an open position. Class 3 metal surface specifications are parts that are wholly or partially concealed during normal use of the vehicle. Parts such as fender aprons, floor pans and unexposed underbody structural members, typify parts that would be specified as Class 3.
