1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 0 2012 01 10 Released D. Jordan, NA, A. Toennessen, EU Controlled document at www.MATS Copyright 2012, Ford Global Technologies, LLC Page 1 of 8 STEEL, SHEET, COLD ROLLED, HIGH STRENGTH WSS-M1A367-A11/A12/A13/A14 SOLID SOLUTION STRENGTHE
2、NED STEEL, SHEET, COLD ROLLED, HIGH STRENGTH WSS-M1A367-A21/A22/A23/A24/A25 BAKE HARDENABLE STEEL, SHEET, COLD ROLLED, HIGH STRENGTH WSS-M1A367-A33/A34/A35/A36/A37/ MICRO-ALLOYED HIGH-STRENGTH LOW-ALLOY A38/A39 STEEL, SHEET, HOT ROLLED, HIGH STRENGTH WSS-M1A367-A44/A45/A46/A47/A48/ MICRO-ALLOYED HIG
3、H-STRENGTH LOW-ALLOY A49/A50 Note: Steels shown in gray typeface are not in the Global material strategy and should not be used without approval from the Sheet Metal Tech Club. 1. SCOPE The materials defined by these Global specifications are fully killed, fine grained, high strength steel sheet wit
4、h specified minimum yield strength between 180 MPa and 550 MPa and good forming, joining, and painting characteristics. The steel sheet may achieve its final thickness by cold rolling, hot rolling, continuous thin-strip casting, or other means. All requirements of the specific variant are to be met
5、regardless of the final thickness reduction method. Specification WSS-M1P94-A shall be used where pre-coating by the steel supplier is required. All requirements of the specific variant are to be met with or without pre-coating, except as noted in these specifications or as noted as exceptions on th
6、e Engineering Drawing. Ford Motor Company may, at its option and in agreement with the local or regional supplier, define additional and/or restricted technical delivery requirements such as mechanical properties, forming characteristics and surface texture, for a specific grade and/or part. The def
7、ined requirements shall be mandatory and no characteristics shall conflict with these engineering specifications. 2. APPLICATION These Global specifications were released originally for automotive body and chassis parts. 2.1 LIMITATIONS Common Global Grade Names are provided for information purposes
8、 and are not intended to be used on Engineering Drawings or CAD files. Not all grade / gauge / width / coating combinations are available. Contact Product Development Materials Engineering for assistance or Global Materials and Fastener Standards () for help in locating the responsible engineer. Var
9、iants shown with an asterisk and gray typeface in Tables 1-4 presently are not in the Global material strategy and should not be used without approval from the Sheet Metal Tech Club. Sources for these grades may not exist in your region. Contact Product Development Materials Engineering for assistan
10、ce or for help in locating the responsible engineer.ENGINEERING MATERIAL SPECIFICATION WSS-M1A367-A11/A50 Copyright 2012, Ford Global Technologies, LLC Page 2 of 8 Material supplied to these specifications may contain titanium or other transition metals as alloying additions. Such alloyed steels, i
11、f subsequently surface treated by a nitrocarburising and/or oxidizing process, risk becoming embrittled due to the formation of ultrafine TiN or other precipitates. Accordingly, special consideration should be given to low carbon steel that contains intentional additions of titanium or other transit
12、ion metals for parts that may be subjected to nitrocarburising and/or oxidizing processes. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). Material s
13、uppliers and part producers must conform to the Companys Quality System Requirements. In order for materials to comply with the requirements of the material specification they shall be sourced from suppliers listed in the Ford Motor Company Approved Source List, (ASL). See also paragraph 4.1. 3.2 CH
14、EMICAL COMPOSITION AND MICROSTRUCTURE (ASTM E112, JIS G0320, ISO 4967 / ASTM E45) 3.2.1 Chemical Composition The upper and lower limits of chemical composition of the controlled elements shall be established by the supplier and included in the suppliers Control Plan. Heat and/or check analyses shall
15、 be provided as part of the initial material source approval process in a format suitable for upload into the Ford Material Database. The choice of strengthening mechanism and the method of inclusion control, inclusion shape control, and/or stabilization shall be identified for the specific process
16、path in the suppliers Control Plan. 3.2.2 Microstructure The grain size number shall be established as part of the initial material source approval process and shall be consistent (within 1 unit) throughout the thickness of the sheet. The steel sheet shall be free from internal defects that adversel
17、y affect manufacturing or part functionality. Examples of defects may include: pipe laminations, non-metallic inclusions, segregation, and blowholes. Non-metallic inclusion content shall not exceed a rating of 2.0 for thin and 2.0 for heavy when tested in accordance with ASTM E45 Method D, Plate III
18、, by analysis at 100X. 3.3 MECHANICAL PROPERTIES (ASTM E8M, ASTM E517, EN 10002, ISO 6892, ISO 10113, ISO 10275, SEP 1240, JIS Z2241) For initial approval requirements see paragraph 4.1. Mechanical properties are valid in the longitudinal direction. Certification of ongoing production material shall
19、 be in accordance with regional and/or local requirements. For the determination of mechanical properties, the material cross sectional area shall be defined as that of the steel; contribution of any metallic and/or organic coating to the calculated cross-sectional area used for stress calculations
20、is neglected. ENGINEERING MATERIAL SPECIFICATION WSS-M1A367-A11/A50 Copyright 2012, Ford Global Technologies, LLC Page 3 of 8 Yield Strength is defined as lower yield stress or 0.2% proof stress (for materials without marked yield point). ASTM Total Elongation is measured with an ASTM (50 mm) test b
21、ar (ASTM E 8M). EN Total Elongation is measured with an ISO II (80 mm) test bar (EN 10002-1). JIS Total Elongation is measured with a JIS #5 test bar (JIS Z 2201). Plastic Strain Ratio (r-value) is defined for a specific test direction with respect to the rolling direction. It is measured at 20% tot
22、al elongation (or maximum uniform elongation if less than 20%). See ASTM E 517, ISO 10113, or JIS Z 2254. Average Plastic Strain Ratio (ravg) is calculated as a weighted average of the individual r-values, i.e., ( 0o + 90o+ 2 x 45o) / 4 Strain Hardening Exponent (n-value) is measured over the range
23、10-20% strain (or 10% to end of uniform elongation if less than 20%). See ASTM E 646 or ISO 10275. If uniform elongation is less than 12%, n-value shall be reported as nUE= UE (n at uniform elongation equals true strain at uniform elongation.) BHI (Bake Hardening Index)is defined as the increase in
24、lower yield strength due exclusively to the baking portion of the following: Strain 2% in the longitudinal direction, note stress and release load. Bake at 170 (+/- 2) deg C peak metal temperature for 20 (+/- 1) minutes. Determine post-bake yield strength per ASTM E 8M, EN 10002-1, EN 10325, or JIS
25、Z 2241. BHI is the difference between the pre-bake stress at 2% strain and the post-bake yield strength. BHI neglects the contribution of work hardening to yield strength and includes only the contribution due to thermal response. Actual processing conditions (temperature profiles and strain conditi
26、ons) dictate the observed strength levels of individual parts. Table 1: Mechanical Properties for Cold Rolled, Solution Strengthened Variants Variant A11 A12 A13* A14 * Common Global Grade Name CR180 CR210 CR240 CR270 Yield Strength, MPa (min)180 210 240 270 Yield Strength, MPa (max) 240 270 300 330
27、 Tensile Strength, MPa (min) 300 320 340 360 ASTM Total Elongation, % (min) 35 33 30 28 EN Total Elongation, % (min) 33 31 28 26 JIS Total Elongation, % (min) 39 37 34 32 ravg(min) 1.3 1.3 1.1 1.0 n value (min) 0.20 0.19 0.15 0.14 * Variants shown with an asterisk and gray typeface are not in the Gl
28、obal material strategy and should not be used without approval from the Sheet Metal Tech Club. Sources for these grades may not exist in your region. Contact Product Development Materials Engineering for assistance or for help in locating the responsible engineer.ENGINEERING MATERIAL SPECIFICATION
29、WSS-M1A367-A11/A50 Copyright 2012, Ford Global Technologies, LLC Page 4 of 8 Table 2: Mechanical Properties for Cold Rolled, Bake Hardenable Variants Variant A21 A22 A23 A24 * A25 * Common Global Grade Name CR180B2 CR210B2 CR240B2 CR270B2 CR300B2 Yield Strength, MPa (min)180 210 240 270 300 Yield St
30、rength, MPa (max) 240 270 300 330 360 Tensile Strength, MPa (min) 300 320 340 360 390 BHI, MPa(min) 30 30 30 30 30 ASTM Total Elongation, % (min) 35 33 30 28 26 EN Total Elongation, % (min) 33 31 28 26 24 JIS Total Elongation, % (min) 39 37 34 32 30 ravg(min) 1.3 1.1 1.1 0,9 0.9 n value (min) 0.19 0
31、.17 0.17 0.15 0.14 Table 3: Mechanical Properties for Typically Cold Rolled, Micro-alloyed High-Strength Low-Alloy Variants Variant A33 A34 A35 A36 A37 A38 A39 * Common Global Grade Name CR240LA CR270LA CR300LA CR340LA CR380LA CR420LA CR500LA Yield Strength, MPa (min)240 270 300 340 380 420 500 Yiel
32、d Strength, MPa (max) 320 350 380 420 460 520 600 Tensile Strength, MPa (min) 320 330 370 410 450 480 560 ASTM Total Elongation, % (min) 28 26 24 22 20 18 16 EN Total Elongation, % (min) 26 24 22 20 18 16 14 JIS Total Elongation, % (min) 32 30 28 26 24 22 20 n value (min) 0.15 0.15 0.14 0.13 0.12 0.
33、11 0.09 * Variants shown with an asterisk and gray typeface are not in the Global material strategy and should not be used without approval from the Sheet Metal Tech Club. Sources for these grades may not exist in your region. Contact Product Development Materials Engineering for assistance or for
34、help in locating the responsible engineer. ENGINEERING MATERIAL SPECIFICATION WSS-M1A367-A11/A50 Copyright 2012, Ford Global Technologies, LLC Page 5 of 8 Table 4: Mechanical Properties for Typically Hot Rolled, Micro-Alloyed High-Strength Low-Alloy Variants A44 A45 A46 A47 A48 A49 A50 Common Global
35、 Name HR270LA HR300LA HR340LA HR380LA HR420LA HR500LA HR550LA Yield Strength, MPa (min)270 300 340 380 420 500 550 Yield Strength, MPa (max) 350 380 420 460 520 600 650 Tensile Strength, MPa (min) 330 370 410 450 480 560 610 ASTM Total Elongation, % (min) 29 27 25 23 22 20 18 EN Total Elongation, %
36、(min) 27 25 23 21 20 18 16 JIS Total Elongation, % (min) 33 31 29 27 26 24 22 n value (min) 0.15 0.14 0.13 0.12 0.11 0.09 0.08 3.4 DIMENSIONS AND DIMENSIONAL TOLERANCES 3.4.1 Thickness and Thickness Tolerance Unless otherwise specified by Ford Motor Company on the Engineering Drawing or Purchase Ord
37、er, the tolerance for thickness shall comply with ESBAU5-1N260-AA or latest level. 3.4.2. Other Dimensional Tolerances Length, width, flatness, camber, out-of-square, mass and other tolerances for the material as delivered by the steel supplier are defined by the relevant local manufacturing activit
38、y. Examples include ASTM A 568M, ASTM A 635M, JFS A 1001, JFS A 2001, EN 10051, EN 10131, and EN 10143. 3.5 FORMABILITY In conjunction with the material supplier and Product Development Materials Engineering, the affected local manufacturing activity shall, as part of the initial material source app
39、roval process, approve the formability of this material by means of laboratory test(s), manufacturing trial(s), and/or another mutually acceptable alternative, using the equipment and methods that are proposed for production. If needed to enable the fabrication of a specific component, restricted to
40、lerances and/or additional material property requirements (i.e., the “quality level“ of the steel) shall be developed by the affected manufacturing activity and the steel supplier. Examples include, but are not limited to: restricted yield strength range, restricted gauge tolerance, specified minimu
41、m n-value, and specified surface roughness. The “quality level“ of the steel for a specific component: shall not conflict with specified requirements in paragraph 3 of this Engineering Material Specification shall be described in detail by the local manufacturing activity shall be a mandatory extens
42、ion of these Engineering Material Specifications ENGINEERING MATERIAL SPECIFICATION WSS-M1A367-A11/A50 Copyright 2012, Ford Global Technologies, LLC Page 6 of 8 Acceptance of subsequent orders by the steel supplier for a given component at the agreed upon quality level implies that all steel supplie
43、d will be of a comparable quality level and will form that part satisfactorily as defined and recorded by the manufacturing activity. The test specimen geometry and orientation relative to the rolling direction are to be established locally to certify ongoing production material. 3.6 JOINABILITY In
44、conjunction with the material supplier and Product Development Materials Engineering, the affected local manufacturing activity shall, as part of the initial material source approval process, approve the joinability (e.g., resistance spot welding, riveting, adhesive bonding) of this material by mean
45、s of laboratory test(s), manufacturing trial(s), and/or another mutually acceptable alternative, using the equipment and methods that are proposed for production. If needed to enable the fabrication of a specific component, restricted tolerances and/or additional material property requirements (i.e.
46、, the “quality level“ of the steel) shall be developed by the affected manufacturing activity and the steel supplier. Examples include, but are not limited to: restricted chemical composition, restricted gauge tolerance, specified minimum n-value, and specified surface condition. The “quality level“
47、 of the steel for a specific component: shall not conflict with specified requirements in paragraph 3 of this Engineering Material Specification shall be described in detail by the local manufacturing activity shall be a mandatory extension of these Engineering Material Specifications Acceptance of
48、subsequent 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 can be joined satisfactorily as defined and recorded by the manufacturing activity. 3.7 SURFACE APPEARANCE, CONDITION, AND SURFACE
49、ROUGHNESS (Ra) 3.7.1 Surface Classification Surface appearance shall be defined as Class 1 or Class 3: A Class 1 surface shall be specified for parts of the vehicle that are exposed to view after paint or trim. A Class 3 surface shall be specified for parts of the vehicle that are concealed during normal use. 3.7.2 Incoming Lubricant Products coated with a designated mill-applied lubricant (i.e., mill oil or prelube) shall comply with the re
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