1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 1 2017 09 06 Revised See Summary of Revisions I. Liu, AP 2012 01 10 Released D. Jordan, NA, A. Toennessen, EU Controlled document at www.MATS Copyright 2017, Ford Global Technologies, LLC Page 1 of 9 STEEL, SHEET, COLD ROLLED, LOW CARBON
2、 WSS-M1A365-A11 STEEL, SHEET, COLD ROLLED, LOW CARBON, WSS-M1A365-A12 GENERAL FORMABILITY STEEL, SHEET, COLD ROLLED, LOW CARBON, WSS-M1A365-A13 IMPROVED FORMABILITY STEEL, SHEET, COLD ROLLED, LOW CARBON, WSS-M1A365-A14 HIGH FORMABILITY STEEL, SHEET, COLD ROLLED, LOW CARBON, WSS-M1A365-A15 EXTRA HIGH
3、 FORMABILITY STEEL, SHEET, HOT ROLLED, LOW CARBON WSS-M1A365-A20 STEEL, SHEET, HOT ROLLED, LOW CARBON, WSS-M1A365-A21 GENERAL FORMABILITY STEEL, SHEET, HOT ROLLED, LOW CARBON, WSS-M1A365-A22 IMPROVED FORMABILITY STEEL, SHEET, HOT ROLLED, LOW CARBON, WSS-M1A365-A23 HIGH FORMABILITY 1. SCOPE The mater
4、ials defined by these Global specifications are fully killed, fine grained, low carbon steel sheet, with specified minimum yield strength between 110 and 240 MPa and good forming, joining, and painting characteristics. The steel sheet may achieve its final thickness by cold rolling, hot rolling, con
5、tinuous thin-strip casting, or other means. All requirements of the specific variant are to be met regardless of the final thickness reduction method. Hot rolled flat products are usually supplied in thicknesses greater than 1.8 mm, for uncoated products in a pickled and oiled condition. Specificati
6、on 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 the Engineering Drawing. ENGINEERING MATERIAL SPECIFICATION WSS-M
7、1A365-A11/A23 Copyright 2017, Ford Global Technologies, LLC Page 2 of 9 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 and are not intended to be used on Engine
8、ering 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. Material supplied to these specifications may
9、 contain titanium or other transition metals as alloying additions. Such alloyed steels, if 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
10、given to low carbon steel that contains intentional additions of titanium or other transition metals for parts that may be subjected to nitrocarburising and/or oxidizing processes. 3. REQUIREMENTS Note: Drawing Precedence Any part specific exceptions or restrictions of requirements listed in paragra
11、ph 3 shall be recorded on the part drawing and have to be considered in all engineering testing and attribute confirmation checklists. 3.1 APPROVED SOURCES This specification requires the use of approved sources. Only the sources identified on the Ford Approved Source List (ASL) can be used when thi
12、s specification is listed on the drawing, CAD file, or other documents. The list of approved sources is located within Ford at or available externally through a Ford Materials Engineer. See also paragraph 4.1. 3.2 CHEMICAL COMPOSITION AND MICROSTRUCTURE (ASTM E112, JIS G0320, ISO 4967 / ASTM E45) 3
13、.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. Guidelines for chemical composition are provided in section 4.4. Heat and/or check analyses shall be provided as pa
14、rt of the initial material source approval process in a format suitable for upload into the Ford Material Database. 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
15、 of the sheet. The steel sheet shall be free from internal defects that adversely 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 th
16、in and 2.0 for heavy when tested in accordance with ASTM E45 Method D, Plate I-r, by analysis at 100X. ENGINEERING MATERIAL SPECIFICATION WSS-M1A365-A11/A23 Copyright 2017, Ford Global Technologies, LLC Page 3 of 9 3.3 MECHANICAL PROPERTIES (ASTM E8M, ASTM E517, ISO 6892-1, ISO 10113, ISO 10275,JIS
17、Z2241,JIS Z2254) For initial approval requirements see paragraph 4.1. Mechanical properties are valid in both the transverse and longitudinal directions. Certification of ongoing production material shall be in accordance with regional and/or local requirements. It is acceptable to certify material
18、for shipment using only one test direction. However, disputes will be settled using longitudinal, transverse and diagonal test bars sampled from the suspect material. For the determination of mechanical properties, the material cross sectional area shall be defined as that of the steel substrate onl
19、y; contribution of any metallic and/or organic coating to the calculated cross-sectional area used for stress calculations is neglected. (i.e. Zn, e-coat and/or paint are not included). This method of determining the cross sectional area of the test bar will be used as the referee method in all case
20、s where the mechanical properties of the incoming material are in dispute. 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 bar (ASTM E 8M). EN Total Elongation is measured wit
21、h an ISO II (80 mm) test bar (ISO 6892-1). JIS Total Elongation is measured with a JIS #5 test bar (JIS Z 2241). Plastic Strain Ratio (r-value) is defined for a specific test direction with respect to the rolling direction. It is measured at 20% total elongation (or maximum uniform elongation if les
22、s 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. For grades with ravg requirements, data is collected for initial source approval. Ongoing certification to ravg
23、 requirements is not required for all coils. However, disputes will be settled using longitudinal, transverse and diagonal test bars sampled from the suspect material. Strain Hardening Exponent (n-value) is measured over the range 10-20% strain (or 10% to end of uniform elongation if less than 20%).
24、 See ASTM E 646 or ISO 10275. n-value measurements only valid for material up to 6.4 mm. For gauges over 6.4 mm n-values are not required. Bend testing shall be performed to ASTM E290. Using a V-Bend test setup through a 90 bend angle. Other test setups may be acceptable at the discretion of the reg
25、ional Materials Engineering Mechanical properties are reported following standard rounding rules. ENGINEERING MATERIAL SPECIFICATION WSS-M1A365-A11/A23 Copyright 2017, Ford Global Technologies, LLC Page 4 of 9 Table 1: Mechanical Properties for Cold Rolled Grades Variant A11 A12 A13 A14 A15 Common G
26、lobal Grade Name CR1 CR2 CR3 CR4 CR5 Yield Strength, MPa (min) 140 140 140 140 110 Yield Strength, MPa (max) 280 240 210 180 160 Tensile Strength, MPa (min) 270 270 270 270 260 Tensile Strength, MPa (max) 410 370 350 330 330 ASTM Total Elongation, %(min) N/R 34 38 40 42 EN Total Elongation, % (min)
27、N/R 34 38 40 42 JIS Total Elongation, % (min) N/R 37 41 43 45 ravg (min) Note 1 N/R N/R 1.5 1.6 1.7 r90 (min) Note 2 N/R 1.3 1.6 1.9 2.0 n value (min) N/R 0.16 0.18 0.20 0.22 Note 1: Calculation by (r0+r90+2r45)/4. The ravg value can be 0.15 lower for thickness 1.50 t 2,00 for both GI and uncoated p
28、roducts. The ravg value can be 0.3 lower for thickness 2.00 t 2,50 for both GI and uncoated products. ravg value not required for thickness above 2.5mm. Note 2: The value of r90 only applies to products of thickness 0.5 mm. The r90 value can be 0.2 lower for thickness 1.50 t 2.00 for both GI and unc
29、oated products. The r90 value can be 0.4 lower for thickness 2.00 t 2.50 for both GI and uncoated products. r90 value not required for thickness above 2.5mm. Table 2: Mechanical Properties for Hot Rolled Grades 3.4 DIMENSIONS AND DIMENSIONAL TOLERANCES 3.4.1 Thickness and Thickness Tolerance Unless
30、otherwise specified by Ford Motor Company on the Engineering Drawing or Purchase Order, 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 del
31、ivered by the steel supplier are defined by the relevant local manufacturing activity, e.g. by referring to the “Sheet Metal Coils and Blanks - Technical Delivery Conditions” document used by Ford Europe or regional industry standards like the ASTM A 568M, A 635M, JFS A 1001, JFS A 2001, EN 10051, E
32、N 10131 and EN 10143 if applicable. Variant A20 A21 A22 A23 Common Global Grade Name HR0 HR1 HR2 HR3 Yield Strength, MPa (min) 240 210 180 180 Yield Strength, MPa (max) 350 320 290 260 Tensile Strength, MPa (min) 310 310 270 270 Tensile Strength, MPa (max) 460 430 400 380 ASTM Total Elongation, % (m
33、in) 26 30 34 38 EN Total Elongation, % (min) 22 26 30 34 JIS Total Elongation, % (min) N/R 33 39 42 n value (min) 0.12 0.14 0.16 0.18 ENGINEERING MATERIAL SPECIFICATION WSS-M1A365-A11/A23 Copyright 2017, Ford Global Technologies, LLC Page 5 of 9 3.5 FORMABILITY In conjunction with the material suppl
34、ier and Product Development Materials Engineering, the affected local manufacturing activity shall, 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 p
35、roduction. If needed to enable the fabrication of a specific component, restricted tolerances 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 limi
36、ted to: restricted yield strength range, restricted gauge tolerance, specified minimum 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 b
37、e described and documented in detail by the local manufacturing activity, e.g. by using the Metal Specification sheets (GSHT3, EU55, EU2066) shall be a mandatory extension of these Engineering Material Specifications Acceptance of subsequent orders by the steel supplier for a given component at the
38、agreed upon quality level implies that all steel supplied will be of a comparable quality level and will form that part satisfactorily as defined and recorded by the manufacturing activity. 3.6 JOINABILITY In conjunction with the material supplier and Product Development Materials Engineering, the a
39、ffected 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 means of laboratory test(s), manufacturing trial(s), and/or another mutually acceptable alterna
40、tive, using the equipment and methods that are proposed for production. Regional requirements exist for initial Material Source Approval: FNA/FSA/APA FLTM BA113-08 (incl. additional supplement for AHSS) FoE SEP 1220-2 Contact Product Development Materials Engineering for assistance or for help in l
41、ocating the responsible engineer. 3.7 SURFACE 3.7.1 Surface Classification Surface quality shall be defined as Exposed (E) or Unexposed (U): An Exposed (E) surface shall be specified for parts of the vehicle that are exposed to view after paint or trim. Classified as a Class 1 surface in ES-F75B-110
42、07-AA An Unexposed (U) surface shall be specified for parts of the vehicle that are concealed during normal use. Classified as a Class 3 surface in ES-F75B-11007-AA A Class 2 surface as defined by ES-F75B-11007-AA has to be specified as either E or U depending on the expectations of Product Developm
43、ent. Note: Designation E replaces Class 1, U replaces Class 3 used in former sheet metal material specifications ENGINEERING MATERIAL SPECIFICATION WSS-M1A365-A11/A23 Copyright 2017, Ford Global Technologies, LLC Page 6 of 9 3.7.2 Incoming Lubricant Products coated with a designated mill-applied lub
44、ricant (i.e., mill oil or prelube) shall comply with the regional requirements. Check with regional manufacturing activity (see Technical Delivery Conditions document in Europe). 3.7.3 Surface Roughness The surface roughness and associated parameters for a given component are to be defined and recor
45、ded by the regional manufacturing activity. 3.7.4 Coating Requirements See WSS-M1P94-A for requirements for coil coatings on steel sheet. 3.8 PAINTABILITY In conjunction with the material supplier and Product Development Materials Engineering, the affected local manufacturing activity shall, as part
46、 of the initial material source approval process, approve the paintability (e.g., compatibility, appearance, performance) 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 pro
47、duction. 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. Ford Motor Company may, at its option and in agreement with the local or
48、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 defined requirements shall be mandatory and no characteristics shall conflict with this engineering
49、 specification. 4.1 INITIAL SUPPLIER APPROVAL BY FORD Suppliers desiring approval of their materials shall first obtain an expression of interest from Purchasing, Design or Product Development and Materials Engineering. The supplier shall submit a completed copy of their laboratory test reports, signed by a qualified and authorized representative of the test facility, demonstrating full compliance with all the re
