1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Revisions 2013 05 06 N Status No direct replacement, use CBP strategy D. Rhuno, NA 2002 08 29 Revised Updated and renumbered 1997 10 01 Activated K. Thurgood Controlled document at www.MATS Page 1 of 4 Copyright 2013,
2、 Ford Global Technologies, Inc. STEEL, SHEET, HOT ROLLED, HIGH STRENGTH, WSS-M1A338-A1 CARBON MANGANESE TYPE NOT TO BE USED FOR NEW DESIGN 1. SCOPE The materials defined by this specification are high strength steels with good forming properties, particularly regarding stretch forming and hole expan
3、sion. The strengthening mechanism is based on solute hardening, arising mainly from the levels of carbon and manganese present. Currently, these steels are only available in hot rolled form. 2. APPLICATION The relatively high tensile strength of these steels give them good fatigue properties. Areas
4、of application would typically be where fatigue loads were encountered, such as chassis components, road wheel rims and discs (spiders), etc. CAUTION: These materials are likely to fail the requirements of the standard Ford Spot Weld Test FLTM BA 013-04 (refer to para 3.6). 3. REQUIREMENTS 3.1 STAND
5、ARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 CHEMICAL COMPOSITION (weight percent) The upper and lower limits of chemical composition shall be established by the suppl
6、ier and be included in the control plan. ENGINEERING MATERIAL SPECIFICATION WSS-M1A338-A1 Page 2 of 4 Copyright 2013, Ford Global Technologies, Inc. 3.3 MECHANICAL PROPERTIES (Longitudinal Tensile Specimens) (ISO 6892/ASTM E 8M/EN 10002) VARIANTS Grade 250 300 350 400 450 Yield Strength (0.2 % PS) M
7、Pa, min 250 300 350 400 450 MPa, max 350 400 450 500 550 Tensile Strength MPa, min 360 440 490 540 570 * % Elongation, min 34 30 26 22 22 (50 mm GL) * Gage lengths other than 50 mm may be used for control purposes, with appropriate correction in % Elongation. In all cases, 50 mm will be considered t
8、he umpire standard gage length. 3.4 THICKNESS AND THICKNESS TOLERANCE The thickness specified on the Engineering Drawing shall be a minimum. Unless otherwise specified by Ford via the Engineering Drawing, the SMRL (see para 3.5) or Purchase (Supply), the tolerance range on thickness shall comply wit
9、h three quarters (0.75X) that stated in the relevant standard. The relevant standards are EN 10051 and ASTM A568M. 3.5 FORMABILITY The quality level of steel supplied to fabricate a specific component shall be negotiated between the manufacturing activity and the steel supplier. Acceptance of subseq
10、uent orders by the steel supplier for a given component at the agreed upon quality level implies that all steel supplied will be of a comparable quality level and will form that part satisfactorily as defined by the manufacturing activity. Ford Motor Company may, at its option and in agreement with
11、the steel supplier, compile a list of property requirements such as mechanical properties, forming characteristics and surface texture, for each specific part. This list will be a mandatory extension of these specifications. The current responsible area within Ford Europe is Advanced Vehicle Technol
12、ogy (AVT); Materials, Fasteners, and Corrosion Protection Engineering (MF also the coating(s), as defined by WSS-M1P94-A. e.g. Steel, Sheet, Hot Rolled, High Strength, Carbon Manganese Type, uncoated, minimum yield strength 300 MPa, for a non-visible sidemember of 2 mm thickness, would be specified thus: . Steel to WSS-M1A338-A: Grade 300: Class 3
