1、WORLDWIDEENGINEERINGSTANDARDSMaterial Specification GMW3224Nominal Sheet Steel Thicknesses and Thickness Tolerances Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Originating Department: North American Engineering Standards Page 1 of 71 ScopeThis specification covers metric sh
2、eet steel thicknesses and thickness tolerance requirements for engineeringpart drawings. This specification is applicable to continuous cast, cold, or hot rolled coated, or uncoated steelsubstrates specified in GMW2, GMW3032, GMW3399, and GMW14400 and supplied as coils or sheet.Thickness tolerances
3、for coated substrates include the specified coating. Additional requirements oragreements shall be specified by local business units.1.1 Material Description. Not applicable.1.2 Symbols. Not applicable.1.3 Typical Applications. Sheet metal parts consisting of uncoated and metallic coated low carbon
4、and highstrength steel substrates.1.4 Remarks. Not applicable.2 ReferencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 External Standards/Specifications.None2.2 GM Standards/Specifications.GMW2 GMW3032 GMW3399GMW8 GMW3059 GMW144002.3 Additional References.x
5、Data Creation Standards (DSC) File Log.x GM Release Engineering Drawing.x TMC003 Material Safety Data Sheet guidance documents (available at ).3 Requirements3.1 Requirements on Delivery.3.1.1 Chemical Requirements. Not applicable.3.1.2 Mechanical Requirements. Not applicable.3.1.3 Physical Requireme
6、nts. Thickness tolerances for coated substrates include the specified coatingexcept for GM Europe (See Deviations Section). The specified nominal thicknesses and tolerances foruncoated and coated low carbon and high strength steel sheet are detailed in Appendix A, Table A1, Table A2,Table A3, and Ta
7、ble 4A. The nominal thickness tolerance is applicable to measurements at any point acrossthe width not less than 40 mm from an edge. Deviations required for individual GM business units are listed inthe Deviations Section at the end of this specification.For blanks rolled with variable thickness, th
8、e tolerance is 0.05 mm for all thickness ranges and materialgrades.3.1.3.1 Business regions may decide, in selective instances, to deviate from the tolerances required in thisspecification. When this occurs, the specified tolerance on the appropriate GM Release Engineering Drawingshall take preceden
9、ce over this specification.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 GMW3224 Copyright 2012 General Motors Company All Rights Reserved
10、October 2012 Page 2 of 73.1.4 Additional Requirements. The rounding-off method shall be used when reporting thickness andthickness tolerances. Reported values shall be rounded to the nearest 0.01 mm and shall utilize the followingprocedure.3.1.4.1 Thickness and thickness tolerances shall be rounded
11、to the nearest 0.01 mm (two decimal places). Ifthe third digit is five or above, the second digit shall be rounded to the next highest number; if the third digit isfour or below, the second digit shall not be changed.3.1.4.2 When employing the rounding method, two or more successive rounding steps s
12、hould be avoided.3.2 Processing Requirements. Not applicable.3.3 Performance Requirements. Not applicable.3.4 Requirements on other Stages during Life Cycle. Not applicable.3.5 Increment for Nominal Thickness. The preferred nominal thickness should follow the increments inTable 1.Table 1: Nominal Th
13、ickness/IncrementsNominal Thickness IncrementsUp to 1.00 mm 0.051.0 up to 2.60 mm 0.102.60 up to 3.4 mm 0.203.5 and higher 0.504 Manufacturing ProcessNot applicable.5 Rules and Regulations5.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recommendationsvalid i
14、n the country of usage.5.2 Language. In the event of conflict between the English and domestic language, the English language shalltake precedence.5.3 Inspection and Rejection. Samples of components or materials released to a GM material specificationshall be tested for conformity with the requireme
15、nts of this material specification and approved by theresponsible Engineering department prior to commencement of delivery of bulk supplies.A new approval must be received for any changes, e.g., properties, manufacturing process, location ofmanufacture, etc. If not otherwise agreed, all testing and
16、documentation normally required for initial releasemust be completed.It is the responsibility of the supplier to inform the customer in a timely manner, without solicitation, and toinclude documentation of all modifications of materials and/or processes and to apply for a new release.If not otherwis
17、e agreed, all release tests shall be repeated and documented by the supplier prior tocommencement of delivery of non-conforming bulk supplies. In individual cases, a shorter test can be agreedto between the responsible Engineering department and the supplier.5.4 Material Safety Data Sheets/Safety Da
18、ta Sheets (MSDS/SDS). For new product submissions, or when achange in chemical composition of an existing product has occurred, a complete copy of the Material SafetyData Sheet/Safety Data Sheet must be submitted in compliance with the Globally Harmonized System ofClassification and Labeling of Chem
19、icals (GHS) requirements or other country-specific MSDS/SDSrequirements. In addition, product MSDS/SDS submissions must be in compliance with specific countryGeneral Motors TMC003 Material Safety Data Sheet/Safety Data Sheet guidance documents where available.5.5 All materials supplied to this stand
20、ard must comply with the requirements of GMW3059, Restricted andReportable Substances for Parts.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 STANDA
21、RDS GMW3224 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 3 of 76 Approved SourcesMaterials supplied to this specification must be approved by General Motors.The appropriate GM Materials Engineering department(s) must confirm material as meeting the requirementsof this s
22、pecification. Any test data sheets of material submitted to General Motors for such confirmation (e.g.,during Production Part Approval Process (PPAP) under this material specification must list all properties andmust apply corresponding test methods of this material specification.7 Notes7.1 Glossary
23、.MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards.7.2 Acronyms, Abbreviations, and Symbols.DCS Data Creation StandardsGHS Globally Harmonized System of Classification and Labeling of ChemicalsMPa MegapascalMSDS Material Safety Data SheetPPAP Production Pa
24、rt Approval ProcessSDS Safety Data Sheet8 Coding SystemThis standard shall be referenced in other documents, drawings, etc., as follows:Material per GMW3224Example:Gauge/Thickness: 1.00 mmThickness Tolerance: Per GMW3224Material/Grade: GMW3032M-ST-S-340LA-HD60G60G-UThe appropriate Release Engineerin
25、g Drawing may also contain the specified thickness and/or thicknesstolerances.When a deviation to GMW3224 occurs or the thickness and/or thickness tolerance is noted on the GM ReleaseEngineering Drawing, the specified thickness and tolerance on the drawing shall take precedence over thisspecificatio
26、n.Example:Gauge/Thickness: 1.00 mmThickness tolerance: 0.04Material/Grade: GMW3032M-ST-S-CR340LA-HD60G60G-UWhere:GMW = Validation Area (GM Worldwide)3032 = Sequential numberGMW3032 =Material Type (Base material specifications)M =Material Type: MetalsST =Category: SteelS =Sub Category: SheetCR =Steel
27、 Product Type: Cold rolled340 =Minimum Yield Strength (MPa)LA =Steel Type (Low Alloy see GMW3032)HD60G60G =Coating designation (see GMW8 for details)U =Surface Quality (GMW3032)Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or
28、networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3224 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 4 of 79 Release and RevisionsThis standard was originated in January 2001. It was first approved by the Global Sheet Metal Specialis
29、t Teamin April 2002. It was first published in August 2002.Issue Publication Date Description (Organization)1 AUG 2002 Initial publication.2 FEB 2007 x Revised paragraph 1, 2.1, 2.2x Table 2, Table 3, and Deviations A3.1.3(Global Sheet Metal Specialist Team)3 SEP 2007 x Title, 3.1.3, 3.1.3.1x Sectio
30、n 3.5 (added), Section 8, Appendix A (Tables A1, A2, A3)x Deviations (3.1.3)(Global Sheet Metal Specialist Team)4 NOV 2007 x Section 8 Clerical changes to callout examples(Global Sheet Metal Specialist Team)5 MAR 2009 Remove reference to thin-slab HR from Tables A1, A2, and A4(Global Sheet Metal Spe
31、cialist Team)6 OCT 2012 x In Section 3.1.3, added tolerances for variable thickness blanksx Added new Table A4x Added description for the example in the Section 8 Coding Systemx Added updated statement for Approved Sources in Section 6(Global Sheet Metal Specialist Team)Copyright General Motors Comp
32、any Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3224 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 5 of 7Appendix ATable A1, Table A2, Ta
33、ble A3, and Table A4 contain the required thickness and thickness tolerance for sheetproducts.Deviations on requirements for individual GM business units are detailed in the Deviations Section.Table A1: Metric Nominal Sheet Steel Thicknesses andTolerances for Minimum Yield Strengths 380 MPa and All
34、GMW3399Specified Cold Rolled Specified Hot RolledNominal (Bare and Coated) Nominal (Bare and Coated)Thickness Note 1 GMW3032 380 MPaGMW3399Thickness Note 1 GMW3032 380 MPaGMW3399(mm) Tolerance (mm) Tolerance0.50 to 0.59 0.03 1.50 to 1.69 0.100.60 to 0.69 0.04 1.70 to 1.89 0.110.70 to 1.09 0.05 1.90
35、to 2.19 0.121.10 to 1.59 0.06 2.20 to 2.59 0.131.60 to 2.29 0.07 2.60 to 4.49 0.142.30+ 0.08 4.50 to 6.49 0.166.50 + 0.22Note 1: Refer to 3.5 for standard thickness increments to be called out on drawings, in the DCS file log, and other GM documents.Table A4: Metric Nominal Sheet Steel Thicknesses a
36、nd Tolerances for GMW14400 SubstratesSpecified Nominal Thickness(in mm)(Bare and Pre-Coated)GMW14400 Sheet Thickness Tolerance6.50 0.22Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from
37、IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW3224 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 7 of 7DeviationsReference 3.1.3, Physical Requirements.For GM Europe, thickness and thickness tolerances shall apply to steels with the coating removedindependent of steel gr
38、ade. Deviations from Table A2 shall apply to thickness tolerances as described inTable Dev 1.Table Dev 1: Metric Nominal Sheet Steel Thicknesses and Tolerancesfor 270 to 380 MPa Yield StrengthsSpecified Cold Rolled Specified Hot RolledNominal (Bare and Coated) Nominal (Bare and Coated)Thickness Note
39、 1 GMW3032270 to 380 MPaThickness Note 1 GMW3032270 to 380 Mpa(mm) Tolerance (mm) Tolerance0.50 to 0.94 0.03 1.50 to 1.89 0.090.95 to 1.39 0.04 1.90 to 2.19 0.101.40 to 1.89 0.05 2.20 to 2.29 0.111.90 to 2.49 0.06 2.30 + 0.122.50 + 0.07Note 1: Refer to 3.5 for standard thickness increments to be called out on drawings, in the DCS file log, and other GM documents.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
