1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2007 02 22 Activated D. Jordan Printed copies are uncontrolled Copyright 2007, Ford Global Technologies, LLC Page 1 of 5 STEEL, SHEET, BORON TREATED, ALUMINIZED, HIGH STRENGTH WSS-M1A357-A1 (NORTH AMERICA APPLICATIONS) 1. SCOPE The material de
2、fined by this specification is a fully killed, fine grained, hot dip aluminized, high strength, boron treated steel. Component manufacture shall be by the combined hot forming/die quenching (press hardening) method. 2. APPLICATION This specification was released originally for A and B pillar reinfor
3、cements, where a high strength-to-weight ratio is required. Mechanical properties of the fully processed part shall meet the requirements of WSS-M99P39-A1/A4 or shall be listed in detail on the individual part Engineering Drawing. Mechanical properties of the fully processed part are a function of t
4、he specific press hardening process selected for part manufacture. The complete part fabrication process shall be outlined in detail in the Process Flow Diagram/PFMEA and maintained in accordance with the documented Control Plan. 2.1 LIMITATIONS Due to the hardenability response of this material, in
5、dividual welding schedules must be developed for each application (see also para. 3.7.) Forming of the blank prior to austenitization is not allowed. Austenitization by induction heating is not allowed. Stress relief annealing or hydrogen bake-out processes (per WSS-M99A3-A) may be necessary for cer
6、tain process paths and shall be described in detail in the part Suppliers Control Plan. De-scaling parts by acid pickling is not allowed. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements for Pr
7、oduction Materials (WSS-M99P1111-A). 3.2 DIMENSIONS AND DIMENSIONAL TOLERANCES 3.2.1 Thickness and Thickness Tolerances The material thickness specified on the Engineering Drawing shall be nominal and shall include both the substrate thickness and the coating thickness. The nominal incoming material
8、 thickness in each area of parts made with multiple-thickness blanks (e.g., tailor welded or tailor rolled) shall be identified on the Engineering Drawing. ENGINEERING MATERIAL SPECIFICATIONWSS-M1A357-A1 Printed copies are uncontrolled Copyright 2007, Ford Global Technologies, LLC Page 2 of 5 Specif
9、ied Nominal Thickness (mm) Tolerance (mm) 0.8 1.19 +/- 0.07 1.2 1.49 +/- 0.08 1.5 1.99 +/- 0.09 2.0 2.59 +/- 0.11 2.6 3.0 +/- 0.14 Refer to WSS-M99P39-A1/A4 for the allowable thickness reduction that results from the press hardening process. 3.2.2 Other Dimensional Tolerances Length, width, flatness
10、, camber, and mass tolerances for the material as delivered by the steel supplier are defined by the relevant national standards. 3.3 MANUFACTURING / PROCESS REQUIREMENTS Final material properties in the part are achieved by heat treatment. Forming of the blank prior to austenitization is not allowe
11、d. Austenitization by induction heating is not allowed. Quenching shall be accomplished by any method (e.g., coolant - jacketed die, direct water contact) that achieves the required final part properties. The specific method shall be described in detail in the part Suppliers Control Plan. The micros
12、tructure of the steel in the final part shall be effectively 100% tempered martensite with a small amount of bainite likely and allowed. Stress relief annealing or hydrogen bake-out processes (per WSS-M99A3-A) may be necessary for certain process paths and shall be described in detail in the part Su
13、ppliers Control Plan. De-scaling parts by acid pickling is not allowed. 3.4 CHEMICAL COMPOSITION (check analysis, weight percent) C 0.25 max Mn 1.40 maxP 0.030 maxS 0.015 max Si 0.50 maxCr 0.35 maxMo 0.35 max B 0.0050 maxN 0.009 max.Al * Ti * Ca * Cu, Ni, Sn, Nb, V * * Sufficient to fully kill the s
14、teel. * Sufficient to stabilize nitrogen. * Sufficient for sulfide inclusion shape control * No requirement. All listed elements shall be reported for initial material source approval and shall be listed on the steel Suppliers Control Plan if added intentionally. ENGINEERING MATERIAL SPECIFICATIONWS
15、S-M1A357-A1 Printed copies are uncontrolled Copyright 2007, Ford Global Technologies, LLC Page 3 of 5 The upper and lower limits for each of the controlled elements shall be established by the Supplier and included in the steel Suppliers Control Plan. Sulfide inclusion shape control is required and
16、shall be accomplished by calcium additions. 3.5 MECHANICAL PROPERTIES (as delivered by steel supplier) Forming of the blank prior to austenitization is not allowed. Therefore, incoming mechanical properties are not defined for this specification. Mechanical properties in the fully processed part sha
17、ll comply with WSS-M99P39-A1/A4 and any other requirements listed on the Engineering Drawing, CAD file, or related documents. 3.6 FORMABILITY The quality level of the steel supplied to fabricate a specific component shall be negotiated between the part supplier and the steel supplier. Steel cleanlin
18、ess may involve the use of a mutually agreed upon referee method. Acceptance of subsequent orders by the part supplier for a given component at the agreed upon quality level implies that all components contain steel of a comparable quality level and will form components satisfactorily as defined by
19、the part supplier. 3.7 WELDABILITY The carbon equivalent of material supplied to this specification will always exceed 0.21 wt.%. Consequently, to demonstrate acceptable weldability of the material and part in the specific application for the material source approval process, the WELDABILITY paragra
20、ph of WSS-M1P39-A1/A4 shall be completed. Note: This material shall be subjected to the entire applicable deformation/heat treatment process, including subsequent thermomechanical treatment (e.g., stress relief annealing) or surface treatment (e.g., shot blasting or oiling) so that the proper surfac
21、e and bulk characteristics will be represented for weldability testing. 3.8 SURFACE FINISH AND APPEARANCE Materials defined by this specification is described as Class 3 (unexposed). The material shall be used only for parts of the vehicle that are concealed during use, per ES-F75B-11007(*). (*) lat
22、est level 3.8.1 Aluminum Coating The incoming steel shall have been coated by a continuous hot dip aluminizing process. Aluminizing of individual blanks or parts is not allowed. The material shall be uniformly coated and free from defects such as blisters, flux, and uncoated spots. Aluminum coating
23、Type 1 per ASTM A 463, with the composition shown below, is required. The as-coated thickness of the aluminized layer shall be 25 +/- 7 microns in any measured location (except on cut edges) as determined in metallographic cross-section. Si 5 11 wt. % Fe 4.5 wt. % max. Other impurities 0.5 wt. % max
24、. Al balance ENGINEERING MATERIAL SPECIFICATIONWSS-M1A357-A1 Printed copies are uncontrolled Copyright 2007, Ford Global Technologies, LLC Page 4 of 5 3.8.2 Coating Bend Test (FLTM BI 009-05) No flaking of the as-coated aluminized coating is allowed when tested with the following modifications: - Th
25、e bending die is to be two times the thickness of the steel panel - Flaking of the coating within 6 mm of the edge shall be disregarded 3.9 PAINTABILITY A suitable paintability (exposure to cleaning, pretreatment, and e-coat processes) test protocol shall be agreed between the component supplier and
26、 the relevant Company activity (e.g., Global Paint Engineering) prior to commencement of the material source approval process. Note: This material shall be subjected to the entire applicable deformation/heat treatment process, including subsequent thermomechanical treatment (e.g., stress relief anne
27、aling) or surface treatment (e.g., shot blasting or oiling) so that the proper surface and bulk characteristics will be represented for paintability testing. 3.10 FINISHED PART REQUIREMENTS Mechanical properties in the fully processed part shall comply with WSS-M99P39-A1/A4 and any other requirement
28、s listed on the Engineering Drawing. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 4.1 INITIAL SUPPLIER APPROVAL BY FORD For initial approval, refer to AVP-T113-018 (Sheet Metal Material Specificatio
29、n/Source Approval Process) in the North America METS EKB. Upon approval, the materials will be added to the Engineering Material Approved Source List (ASL). 4.2 REFERENCE DOCUMENTS The reference documents are: ASTM A 463 Specification for Steel Sheet, Aluminum-Coated, by the Hot-Dip Process ES-F75B-
30、11007-(*) Specification Sheet Metal Surfaces and Edges FLTM BI 009-05 Bend Test for Coating Adhesion WSS-M99P39-A1/A4 Performance, Steel, Sheet, Boron Treated, Aluminized, High Strength WSS-M99A3-A Embrittlement Avoidance WSS-M99P9999-A1 Restricted Substance Management Standard WSS-M99P1111-A Standa
31、rd Requirements for Production Materials (* latest level) ENGINEERING MATERIAL SPECIFICATIONWSS-M1A357-A1 Printed copies are uncontrolled Copyright 2007, Ford Global Technologies, LLC Page 5 of 5 4.3 METHOD OF SPECIFYING The specification on the Engineering Drawing, CAD file, or related documents sh
32、all include the base steel, the performance requirements, and the surface classification. e.g., Steel to WSS-M1A357-A1, press hardened to WSS-M99P39A-A2, tensile test specimens located and oriented as shown, 1.5 mm nominal thickness, Class 3. 4.4 TYPICAL CHEMICAL COMPOSITION (WT.%) (see 3.4) Ti 0.03 0.05 (Greater than 3.4 x the N level) Al 0.02 0.06 Ca 0.001 0.005
