1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16066 Aluminized Sheet Steel Copyright 2011 General Motors Company All Rights Reserved July 2011 Originating Department: North American Engineering Standards Page 1 of 7 1 Scope This standard covers the requirements for hot dip aluminum coat
2、ing to a sheet steel substrate utilizing a continuous hot dip process. The substrate may be cold or hot rolled sheet steel. Additional requirements or agreements shall be specified by the local business units. 1.1 Material Description. The type of coating and its mass and finish are specified by the
3、 suffixes added to the basic steel substrate specification number. The first two letters, AL, will designate a continuous hot dip Aluminum coating. The Coating Type is identified by a letter-number combination. T1M is a Type 1 aluminum-silicon alloy. T2M is Type 2 commercially pure aluminum. The coa
4、ting mass for each side is designated by a minimum value in g/m2. The coating designations for steels supplied under this standard shall reflect coatings weights in metric units. The “M” suffix was added to T1 and T2 for clarification. 1.2 Symbols. Not applicable. 1.3 Typical Applications. Aluminum
5、coated sheet metal parts consisting of steel substrates described by GMW2, GMW3032 or GMW3399 that are aluminum coated as described herein. Type 1 Coatings are generally specified for heat shields and fuel tanks. 1.4 Remarks. This specification supersedes GM6178M for new applications. A conversion f
6、rom GM6178M to GMW16066 is listed in Appendix A1, Table A1. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM A428 ISO 7438 2.2 GM Standards/Specifications. GMW2 GMW3059 GMW14019 GMW3032 GMW3399 2.3 Additional
7、 References. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements 3.1 Coating Type. Type 1 coating is a hot dip aluminum-silicon alloy containing 5 to 11% silicon to promote adhesion. Type 1 coatings are generally specified for heat and corrosion resisting application
8、s. Type 2 coating is a commercially pure aluminum hot dip coating generally specified for applications which require corrosion resistance. 3.2 Coating Mass. The coating mass (weight) is described in Table 1. Coating mass shall be determined by ASTM A428. Coating thickness is listed for reference onl
9、y in Appendix A2, Table A2. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16066 Copyright 2011 General Motors Company All Rights Reserv
10、ed July 2011 Page 2 of 7 Table 1: Coating Mass (Weight) Note 1 Coating Designation Triple-Spot Test, Total Both Sides, Minimum g/m2 Single-Spot Test, Total Both Sides, Minimum g/m2 T1M-60 60 45 T1M-80 80 65 T1M-100 100 80 T1M-120 120 90 T1M-300 300 270 T2M-60 60 45 T2M-80 80 65 T2M-100 100 80 T2M-12
11、0 120 90 T2M-200 200 180 T2M-300 300 270 Note 1: Hot dip aluminum coatings are not evenly deposited on each side of the sheet. Normally, not less than 40% of the single-spot test limit will be found on either side of the sheet. 3.3 Base Metal. The sheet steel base metal chemical composition shall co
12、nform to the requirements specified in GMW2, GMW3032 or GMW3399. 3.4 Surface Treatment. Products coated with a designated lubricant (e.g., mill oil or prelube) shall comply with GMW14019. 3.5 Coating Bend Test. All bend tests shall be conducted in accordance with ISO 7438. For all steels supplied ac
13、cording to GMW2 and GMW3032 (with 0.2% offset yield strength 500 MPa and all GMW3399 grades, the steel must be capable of a 90 degree test in any direction at a minimum bend radius (r) related to the steel thickness (t) without flaking on the outside of the bend. Refer to Appendix B, Table B1 for mi
14、nimum bend radii for each grade and Figure B1 for a diagram of the test setup. For testing of all steels, flaking of the coating within 6 mm of the edge of the bend test shall not be cause for rejection. The specimens shall not be cut 25 mm from the coil edges of the test sheet. 4 Manufacturing Proc
15、ess 4.1 Welding. The steel substrates supplied to this standard shall be suitable for welding by the accepted local welding methods. When the steel is used in welded applications, welding procedures shall be suitable for the steel chemistry and intended service. 5 Rules and Regulations 5.1 Legal Reg
16、ulations. All materials must satisfy applicable laws, rules, regulations and recommendations valid in the country of usage. 5.2 Language. In the event of conflict between the English and domestic language, the English language shall take precedence. 5.3 Inspection and Rejection. Samples of component
17、s or materials released to a GM material specification shall be tested for conformity with the requirements of this material specification and approved by the responsible Engineering department prior to commencement of delivery of bulk supplies. Copyright General Motors Company Provided by IHS under
18、 license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16066 Copyright 2011 General Motors Company All Rights Reserved July 2011 Page 3 of 7 A new approval must be received for any changes, e.g., pr
19、operties, manufacturing process, location of manufacture, etc. If not otherwise agreed, all testing and documentation normally required for initial release must be completed. It is the responsibility of the supplier to inform the customer in a timely manner, without solicitation, and to include docu
20、mentation of all modifications of materials and/or processes and to apply for a new release. If not otherwise agreed, all release tests shall be repeated and documented by the supplier prior to commencement of delivery of non-conforming bulk supplies. In individual cases, a shorter test can be agree
21、d to between the responsible Engineering department and the supplier. 5.4 Initial Source Approval. No shipments shall be made by any supplier until representative initial production samples have been approved by the appropriate Materials Engineering department(s) as meeting the requirements of this
22、specification. 5.5 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new product submissions, or when a change in chemical composition of an existing product has occurred, a complete copy of the Material Safety Data Sheet/Safety Data Sheet must be submitted in compliance with the Global
23、ly Harmonized System of Classification and Labeling of Chemicals (GHS) requirements or other country-specific MSDS/SDS requirements. In addition, product MSDS/SDS submissions must be in compliance with specific country General Motors TMC003 Material Safety Data Sheet/Safety Data Sheet guidance docum
24、ents where available. 5.6 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Engineering qualifications of an approved source are required for this standard. Only sources listed in the GM Materials
25、File (i.e., GM Supply Power) under this standard number have been qualified by engineering as meeting the requirements of this standard. For other GM locations, the responsible engineering group should be contacted to obtain the approved source in that individual country. 7 Notes 7.1 Glossary. T1: T
26、ype 1 Aluminum-Silicon Alloy. T2: Type 2 Commercially Pure Aluminum. 7.2 Acronyms, Abbreviations, and Symbols. 0T Zero T Bend Test AL Aluminum ASTM ASTM International CR Cold Rolled GHS Globally Harmonized System GPSC Global Purchasing and Supply Chain HR Hot Rolled ISO International Organization fo
27、r Standardization MPS Manufacturing Engineering Metal Parts Specification MSDS Material Safety Data Sheet SDS Safety Data Sheet VTS Vehicle Technical Specification Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking pe
28、rmitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16066 Copyright 2011 General Motors Company All Rights Reserved July 2011 Page 4 of 7 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16066 The coding system f
29、or GMW sheet steel specifications on engineering part drawings shall use a nomenclature consisting of material, grade and coating designation. The coding system for GMW sheet steel specifications on manufacturing engineering documents (i.e., GMNA Manufacturing Engineering Metal Parts Specification (
30、MPS) Sheets) shall also consist of material, grade and coating designation, but with additional designations for type of sheet steel and formability grade for low carbon steel base metals, or type of sheet steel and minimum yield strength for high strength steel base metals. The designation for type
31、 of sheet metal used for base metal (i.e., CR for cold rolled, HR for hot rolled), formability grade for low carbon steel base metal or minimum yield strength for high strength steel base metal is contained in the applicable global standard or industry base metal material specification. The coating
32、designation is defined in Material Description. 8.1 Example of Engineering Part Drawing Coding. 8.1.1 Example of engineering part drawing coding for sheet steel, grade, and coating (material, grade, and coating system): GMWXM-ST-S-XXX-AL-TYM-ZZ Where: GMW = Validation Area (GM Worldwide) X = Sequent
33、ial Number GMWX = Base Metal Specification M = Material Type: Metals ST = Category: Steel S = Sub Category: Sheet XXX = Steel Product Type, Grade AL = Hot Dip Aluminum Coating TY = Coating Designation Where Y = coating type per 3.1 M = Denotes metric units ZZ = Coating Mass Where ZZ = Mass per 3.2 8
34、.2 Example of Manufacturing Engineering Document Coding. 8.2.1 Example of Manufacturing Engineering Document Coding with additional designations for type of sheet steel (CR = cold rolled) and formability grade or yield strength (XXX): GMWXM-ST-S-CRXXX-AL-TYM-ZZ Where: GMW = Validation Area (GM World
35、wide) X = Sequential Number GMWX = Base Metal Specification M = Material Type: Metals ST = Category: Steel S = Sub Category: Sheet CRXXX = Steel Metal Type (CR) and Grade (XXX) AL = Hot Dip Aluminum Coating TY = Coating Designation Where Y = Coating Type per 3.1 M = Denotes metric units ZZ = Coating
36、 Mass Where ZZ = Mass per 3.2 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16066 Copyright 2011 General Motors Company All Rights Rese
37、rved July 2011 Page 5 of 7 9 Release and Revisions This standard was originated in September 2008. It was first approved by Global Sheet Metal Team in June 2009. It was first published in June 2009. Issue Publication Date Description (Organization) 1 JUN 2009 Initial publication. 2 MAY 2010 Update 3
38、.3 aluminized steel yield strength requirements. (Global Sheet Metal Team) 3 JUL 2011 1.1 Material Description and Table 1 (added M-designation for metric), 3.3 Removed YS deviation (see base metal specs), 8.1 and 8.2 (added M-designation), Appendix A, Tables A1 and A2 (added M-designation). (Global
39、 Sheet Metal Team) Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16066 Copyright 2011 General Motors Company All Rights Reserved July 2
40、011 Page 6 of 7 Appendix A A1 Conversion from GM6178M Table A1: GM6178M to GMW16066 Conversion (English to SI Units) GMW16066 Coating Designation GM6178M Designation T1M-60 - T1M-80 Note 1 T1 25 (English units) T1M-100 - T1M-120 T1 40 (English units) T1M-300 - T2M-40 - T2M-200 - T2M-300 - Note 1: Pa
41、rts originally specified with GM6178M T1 25 may contain a 75 g/m2 minimum coating mass. New designs or updated carryover parts shall comprehend the 80 g/m2 minimum coating mass requirement. A2 Coating Thickness Table A2: Coating Mass (Weight) Coating Designation Triple-Spot Test, Total Both Sides, M
42、inimum g/m2 Single-Spot Test, Total Both Sides, Minimum g/m2 Calculated Coating Thickness Based on Single Spot Test Note 1 m T1M-60 60 45 17 T1M-80 80 65 24 T1M-100 100 80 30 T1M-120 120 90 34 T1M-300 300 270 100 T2M-60 60 45 17 T2M-80 80 65 24 T2M-100 100 80 30 T2M-120 120 90 33 T2M-200 200 180 67
43、T2M-300 300 270 100 Note 1: Thickness calculation based on a density of 2657 kg/m3 for Type 1 and 2699 kg/m3 for Type 2 aluminum coatings. Hot dip aluminum coatings are not evenly deposited on each side of the sheet. Normally, not less than 40% of the single-spot test limit will be found on either s
44、ide of the sheet. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16066 Copyright 2011 General Motors Company All Rights Reserved July 20
45、11 Page 7 of 7 Appendix B B1 Minimum Bend Radii for Coating Adhesion of High Strength and Advanced High Strength Steels Aluminum Coating Adhesion Testing shall be performed in accordance to ISO 7438. Table B1: Grade (Coated to GMW16066) Grade (Coated to GMW16066) Minimum Bend Radius, r GMW3032M-ST-S
46、 HR550LA 2t GMW3399M-ST-S CR450T/250Y DP 1t GMW3399M-ST-S CR490T/290Y DP 1t GMW3399M-ST-S CR590T/280Y DP 1t GMW3399M-ST-S CR590T/340Y DP 1t GMW3399M-ST-S CR590T/420Y DP 1t GMW3399M-ST-S CR690T/550Y DP 2t GMW3399M-ST-S CR780T/420Y DP 1t GMW3399M-ST-S CR780T/500Y DP 2t GMW3399M-ST-S CR980T/550Y DP 3t GMW3399M-ST-S CR980T/650Y DP 4t All other GMW3399 steels 1t Figure B1: 90 Degree Bend Test SchematicCopyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
