FORD WSS-M1A368-A85-2017 STEEL SHEET COLD ROLLED MARTENSITIC (CR MS) TO BE USED WITH FORD WSS-M99P1111-A (Shown on FORD WSS-M1A368-A11).pdf

1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev. 1 2017 09 08 Revised See Summary of Revisions D. Ruhno, NA 2012 01 10 Released D. Jordan, NA, A. Toennessen, EU Controlled document at www.MATS Copyright 2017, Ford Global Technologies, LLC Page 1 of 13 STEEL, SHEET, COLD ROLLED, DUAL PH

2、ASE (CR DP) WSS-M1A368-A/11/A12/A13/A14/A15 /A16 STEEL, SHEET, COLD ROLLED, ENHANCED DUAL PHASE (CR DH) WSS-M1A368-A26/A27 STEEL, SHEET, HOT ROLLED, DUAL PHASE (HR DP) WSS-M1A368-A31/A32 STEEL, SHEET, HOT ROLLED, FERRITE BAINITE (HR FB) WSS-M1A368-A42/A43 STEEL, SHEET, COLD ROLLED, RETAINED AUSTENIT

3、E (CR RA) WSS-M1A368-A53/A54/A55 STEEL, SHEET, COLD ROLLED, COMPLEX PHASE (CR MP) WSS-M1A368-A61/A62/A63 STEEL, SHEET, HOT ROLLED, COMPLEX PHASE (HR MP) WSS-M1A368-A71/A72 STEEL, SHEET, COLD ROLLED, MARTENSITIC (CR MS) WSS-M1A368-A81/A82/A83/A84/85 STEEL, SHEET, HOT ROLLED, MARTENSITIC (HR MS) WSS-M

4、1A368-A91 Note: Grades shown in gray typeface are not in the Global material strategy and should not be used without approval from the Global Sheet Metal Tech Club. 1. SCOPE The materials defined by these Global specifications are hot rolled or cold rolled steel sheet with specified tensile strength

5、s from 450 MPa to 1700 MPa, suitable for cold forming such as stamping, roll forming and tube making, and use in automotive applications. The specification applies to uncoated and coated steel sheet generally categorized as advanced high strength steels: - Dual Phase (ferrite and martensite microstr

6、ucture, including grades with low and high yield, DP) - Dual Phase Improved Formability (ferrite, martensite and retained austenite, DH) - Ferrite-Bainite (ferrite and bainite microstructure, High Hole Expansion, FB) - “Multi-Phase“ or “Complex Phase“ (ferrite, martensite, bainite plus precipitation

7、 hardening, MP) - Retained Austenite (designed with expected amounts of retained austenite, RA) - Martensitic (mainly martensitic microstructure, MS) The steel sheet may achieve its final thickness by cold rolling, hot rolling, continuous thin-strip casting, or other means. All requirements of the s

8、pecific variant are to be met 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 o

9、r as noted as exceptions on the Engineering Drawing. ENGINEERING MATERIAL SPECIFICATION WSS-M1A368-A11/A91 Copyright 2017, Ford Global Technologies, LLC Page 2 of 13 2. APPLICATION These Global specifications were released originally for automotive body and chassis parts. 2.1 LIMITATIONS Common Glob

10、al Grade Names are provided for information purposes 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 (

11、) for help in locating the responsible engineer. Variants shown with an asterisk and gray typeface in Tables 1-9 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 Pr

12、oduct Development Materials Engineering for assistance or for help in locating the responsible engineer. High strength materials delivered to this specification may be sensitive to hydrogen assisted cracking. Electro galvanized products may require baking treatment. Material supplied to these speci

13、fications may 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 considerati

14、on should be 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 list

15、ed in paragraph 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

16、used when this 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

17、/ 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. Guidelines for chemical composition are provided in section 4.4. Heat and/or check analyses shall be p

18、rovided as part of the initial material source approval process in a format suitable for upload into the Ford Material Database. ENGINEERING MATERIAL SPECIFICATION WSS-M1A368-A11/A91 Copyright 2017, Ford Global Technologies, LLC Page 3 of 13 The choice of strengthening mechanism and the method of in

19、clusion control, inclusion shape control, and/or stabilization shall be identified for the specific process 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 un

20、it) throughout the thickness 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 e

21、xceed a rating of 2.0 for thin and 2.0 for heavy when tested in accordance with ASTM E 45 Method D, Plate I-r, by analysis at 100X. 3.3 MECHANICAL PROPERTIES (ASTM E8M, ASTM E290, ASTM E646, ISO 6892-1, EN 10325, ISO 10275, ISO/TS 16630, JFS T 1001, JIS Z 2241, JIS Z2241) For initial approval requir

22、ements see paragraph 4.1. Mechanical properties listed are valid in longitudinal direction. Certification of ongoing production material shall be in accordance with regional and/or local requirements. For the determination of mechanical properties, the material cross sectional area shall be defined

23、as that of the steel substrate only; contribution of any metallic and/or organic coating to the cross-sectional area used for stress calculation 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 refe

24、ree method in all cases 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 Elon

25、gation is measured with an ISO II (80 mm) test bar (ISO 6892-1). JIS Total Elongation is measured with a JIS #5 test bar (JIS Z 2241). Strain Hardening Exponent (n-value) is measured over the range 10-20% strain (or 10% to end of uniform elongation if less than 20%). See ASTM E 646 or ISO 10275. If

26、uniform elongation is less than 12%, n-value shall be reported as nUE = UE (n at uniform elongation equals true strain at uniform elongation.) For grades with both n4-6 value and n10-20 value requirements, data is collected for initial source approval. Ongoing coil certification to n4-6 value is not

27、 required. However, disputed material is expected to meet both n-value ranges if both are called for in the specification. For grades with only n4-6 value requirements, the tested value is expected on the material certification. Required n-value measurements are only valid for material thicknesses u

28、p to 6.4 mm. For gauges over 6.4 mm, n-value is not required. BHI (Bake Hardening Index) is defined as the increase in 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 me

29、tal temperature for 20 (+/- 1) minutes. ENGINEERING MATERIAL SPECIFICATION WSS-M1A368-A11/A91 Copyright 2017, Ford Global Technologies, LLC Page 4 of 13 Determine post-bake yield strength per ASTM E 8M, ISO 6892-1, EN 10325, or JIS Z 2241. BHI is the difference between the pre-bake stress at 2% stra

30、in 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 conditions) dictate the observed strength levels of individual parts. Hole

31、Expansion Ratio (HER)1 testing shall be performed to ISO/TS 16630 or JIS Z2256. For grades with HER requirements, data is collected for initial source approval. Ongoing coil certification to HER requirements is not required. However, formability disputes will be settled with a 20 sample test taken f

32、rom the suspect material. The mean of this test is expected to be one standard deviation above the minimum requirement. 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 regional Materials Engi

33、neering Mechanical properties are reported following standard rounding rules. ENGINEERING MATERIAL SPECIFICATION WSS-M1A368-A11/A91 Copyright 2017, Ford Global Technologies, LLC Page 5 of 13 Table 1: Mechanical Properties Dual Phase Cold Rolled Grades Variant A11 * A12 * A13 A14 A15 A16 * Common Glo

34、bal Grade Name CRDP450 CRDP500 CRDP600 CRDP800 CRDP1000 DP1000HY Yield Strength, MPa (min) 250 290 340 420 550 700 Yield Strength, MPa (max) 320 390 440 550 700 850 Ult. Tensile Strength, MPa (min) 450 490 590 780 980 980 Ult. Tensile Strength, (typ. max) 560 600 700 900 1130 1130 ASTM Total Elongat

35、ion, % (min) 28 26 21 14 8 9 EN Total Elongation, % (min) 27 24 20 14 10 8 JIS Total Elongation, % (min) 30 27 22 17 10 9 n10-20% value (min) 0.16 0.15 0.14 0.11 0.06 - n4-6% value (min) - 0.19 0.18 0.15 0.08 - BHI, MPa (min) 30 30 30 30 30 30 Minimum bending radius, L, T - - - - 2.5T 2.5 T Note: UT

36、S max values for Table 1 grades are not required attributes from the steel supplier but can be used as representative values for calculations that require a max value. Table 2: Mechanical Properties Dual Phase Cold Rolled Grades with Improved Formability Variant A26 A27 * Common Global Grade Name CR

37、DH800 CRDH1000 Yield Strength, MPa (min) 440 700 Yield Strength, MPa (max) 550 850 Ult. Tensile Strength, MPa (min) 780 980 Ult. Tensile Strength, MPa (max) 900 1180 ASTM Total Elongation, % min 19 14 EN Total Elongation, % min 18 13 JIS Total Elongation, % (min) 19 14 n10-20% value (min) 0.13 N/A n

38、4-6% value (min) 0.18 N/A BHI, MPa (min) 30 30 Table 3: Mechanical Properties Dual Phase Hot Rolled Grades Variant A31 A32 * Common Global Grade Name HRDP600 HRDP800 Yield Strength, MPa (min) 330 450 Yield Strength, MPa (max) 450 610 Ult. Tensile Strength, MPa (min) 580 780 Ult. Tensile Strength, MP

39、a (max) 680 920 ASTM Total Elongation, % min 21 15 EN Total Elongation, % min 19 14 JIS Total Elongation, % (min) 20 16 n10-20% value (min) 0.13 0.11 n4-6% value (min) 0.16 0.16 BHI, MPa (min) 30 30 * Variants shown with an asterisk and gray typeface are not in the Global material strategy and shoul

40、d not be used without approval from the Global Sheet Metal Tech Club. Sources for these ENGINEERING MATERIAL SPECIFICATION WSS-M1A368-A11/A91 Copyright 2017, Ford Global Technologies, LLC Page 6 of 13 grades may not exist in your region. Contact Product Development Materials Engineering for assistan

41、ce or for help in locating the responsible engineer. Table 4: Mechanical Properties Ferrite-Bainite Hot Rolled Grades Variant A42 A43 * Common Global Grade Name HRFB600 HRFB800 Yield Strength, MPa (min) 440 600 Yield Strength, MPa (max) 600 760 Ult. Tensile Strength, MPa (min) 580 780 Ult. Tensile

42、Strength, MPa (max) 700 920 ASTM Total Elongation, % min 16 13 EN Total Elongation, % min 15 12 JIS Total Elongation, % (min) 16 13 n10-20% value (min) 0.08 0.07 Hole Expansion Ratio1 (%, min) 65 50 Table 5: Mechanical Properties Retained Austenite Cold Rolled Grades Variant A53 * A54 A55 Common Glo

43、bal Grade Name CRRA800 CRRA1000 CRRA1200 Yield Strength, MPa (min) 450 600 850 Yield Strength, MPa (max) 570 850 1100 Ultimate Tensile Strength (min) 780 980 1180 Ultimate Tensile Strength (max) 900 1100 1300 ASTM Total Elongation, % min 22 20 13 EN Total Elongation, % min 21 19 13 JIS Total Elongat

44、ion, % (min) 23 21 14 n10-20% value (min) 0.16 0.11 - n4-6% value (min) 0.18 0.12 0.07 BHI, MPa (min) 30 30 30 Minimum bending radius, L, T 2T 2T 2.5T Table 6: Mechanical Properties Multiphase Cold Rolled Grades Variant A61 * A62 * A63 * Common Global Grade Name CRMP800 CRMP1000 CRMP1200 Yield Stren

45、gth, MPa (min) 570 780 900 Yield Strength, MPa (max) 720 950 1100 Ultimate Tensile Strength (min) 780 980 1180 Ultimate Tensile Strength (max) 920 1140 1350 ASTM Total Elongation, % min 11 7 6 EN Total Elongation, % min 10 6 5 JIS Total Elongation, % (min) 11 7 6 n10-20% value (min) - - BHI, MPa (mi

46、n) 30 30 30 Minimum bending radius, L, T - 2.5T 3.5T * Grades shown with an asterisk and gray typeface are not in the Global material strategy and should not be used without approval from the Global Sheet Metal Tech Club. Sources for these grades ENGINEERING MATERIAL SPECIFICATION WSS-M1A368-A11/A91

47、 Copyright 2017, Ford Global Technologies, LLC Page 7 of 13 may not exist in your region. Contact Product Development Materials Engineering for assistance or for help in locating the responsible engineer. Table 7: Mechanical Properties Multiphase Hot Rolled Grades Variant A71 A72 * Common Global Gr

48、ade Name HRMP800 HRMP1000 Yield Strength, MPa (min) 660 720 Yield Strength, MPa (max) 820 920 Ultimate Tensile Strength (min) 760 950 Ultimate Tensile Strength (max) 960 1150 ASTM Total Elongation, % min 11 - EN Total Elongation, % min 10 9 JIS Total Elongation, % (min) 11 - n10-20% value (min) - - BHI, MPa (min) 30 30 Table 8: Mechanical Properties Martensitic Cold Rolled Grades Variant A81 A82 A83 A84 A85 Common Global Grade Name CRMS900