1、Designation: A924/A924M 16a1A924/A924M 17Standard Specification forGeneral Requirements for Steel Sheet, Metallic-Coated bythe Hot-Dip Process1This standard is issued under the fixed designation A924/A924M; the number immediately following the designation indicates the yearof original adoption or, i
2、n the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1 NOTESummary of Changes reinstated editorially in June 2016.1. Scope*1.1 This specification c
3、overs the general requirements that, unless otherwise specified in the product specification, apply to steelsheet in coils and cut lengths, metallic-coated on continuous lines by the hot-dip process. The product is intended for applicationsrequiring corrosion resistance. The product specifications c
4、ontain requirements for specific strength levels, heat resistance,paintability, or formability, or a combination thereof.1.2 Subject to individual product specification provisions, steel sheet is available as Commercial Steel (CS) Types A, B, and C,Forming Steel (FS), Drawing Steel (DS), Deep Drawin
5、g Steel (DDS), Extra Deep Drawing Steel (EDDS), High Temperature Steel(HTS), Structural Steel (SS), and High Strength Low Alloy Steel (HSLAS). Steel sheet is produced with the following metalliccoatings. Specific information on each of the following is contained in the individual product specificati
6、on:1.2.1 Zinc or zinc-iron alloy coated,1.2.2 Zinc-5 % aluminum alloy coated,1.2.3 55 % aluminum-zinc alloy coated,1.2.4 Aluminum or aluminum-silicon alloy coated,1.2.5 Zinc-aluminum-magnesium alloy coated.1.3 Products covered by this general requirements specification are described in the following
7、 product standards: SpecificationsA463/A463M; A653/A653M; A755/A755M; A792/A792M; A875/A875M; A929/A929M; A1046/A1046M; A1057/A1057M;A1063/A1063M; and A1079.1.4 Metallic-coated steel sheet is produced to various coating designations, as shown in the individual product specifications.Except for diffe
8、rentially coated sheet, the coating is always expressed as the total coating of both surfaces.1.5 In case of any conflict in requirements, the requirements of the individual product specifications shall prevail over those ofthis general specification.1.6 The purchaser is permitted to specify additio
9、nal requirements that do not negate any of the provisions of this generalspecification or of the individual product specifications. Such additional requirements, the acceptance of which are subject tonegotiation with the supplier, shall be included in the order information.1.7 For purposes of determ
10、ining conformance with this specification and the various product specifications referenced in 1.3,values shall be rounded to the nearest unit in the right-hand place of figures used in expressing the limiting values (except to thenearest 5 MPa for SI strength values) in accordance with the rounding
11、 method of Practice E29.1.8 Metallic-coated steel sheet covered by this specification is produced to thickness requirements expressed to 0.001 in. 0.01mm for both coils and cut lengths. The thickness is the total of the base steel and the coating.1.9 The text of this specification references notes a
12、nd footnotes that provide explanatory material. These notes and footnotes(excluding those in tables and figures) shall not be considered as requirements of the specification.1.10 The values stated in inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI unit
13、sare shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be usedindependently of the other.1 This specification is under the jurisdiction ofASTM Committee A05 on Metallic-Coated Iron and Steel Products and is the direct responsibility of Subcomm
14、ittee A05.11on Sheet Specifications.Current edition approved June 1, 2016May 1, 2017. Published June 2016May 2017. Originally approved in 1994. Last previous edition approved in 20162016a asA924/A924M - 16.A924/A924M - 16A. DOI: 10.1520/A0924_A0924M-16A.10.1520/A0924_A0924M-17.This document is not a
15、n ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate.
16、In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States11.11
17、This specification and some of the applicable product specifications are expressed in both inch-pound and SI units.However, unless the order specifies the applicable “M” specification designation (SI units), the product shall be furnished toinch-pound units.1.12 This standard does not purport to add
18、ress all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.1.13 This international standard was developed in accordan
19、ce with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Stand
20、ards:2A90/A90M Test Method for Weight Mass of Coating on Iron and Steel Articles with Zinc or Zinc-Alloy CoatingsA370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA428/A428M Test Method for Weight Mass of Coating on Aluminum-Coated Iron or Steel ArticlesA463/A463M Specificati
21、on for Steel Sheet, Aluminum-Coated, by the Hot-Dip ProcessA653/A653M Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by theHot-Dip ProcessA700 Guide for Packaging, Marking, and Loading Methods for Steel Products for ShipmentA751 Test Methods, Practic
22、es, and Terminology for Chemical Analysis of Steel ProductsA754/A754M Test Method for Coating Weight (Mass) of Metallic Coatings on Steel by X-Ray FluorescenceA755/A755M Specification for Steel Sheet, Metallic Coated by the Hot-Dip Process and Prepainted by the Coil-Coating Processfor Exterior Expos
23、ed Building ProductsA792/A792M Specification for Steel Sheet, 55 % Aluminum-Zinc Alloy-Coated by the Hot-Dip ProcessA875/A875M Specification for Steel Sheet, Zinc-5 % Aluminum Alloy-Coated by the Hot-Dip ProcessA902 Terminology Relating to Metallic Coated Steel ProductsA929/A929M Specification for S
24、teel Sheet, Metallic-Coated by the Hot-Dip Process for Corrugated Steel PipeA1030/A1030M Practice for Measuring Flatness Characteristics of Steel Sheet ProductsA1046/A1046M Specification for Steel Sheet, Zinc-Aluminum-Magnesium Alloy-Coated by the Hot-Dip ProcessA1057/A1057M Specification for Steel,
25、 Structural Tubing, Cold Formed, Welded, Carbon, Zinc-Coated (Galvanized) by theHot-Dip ProcessA1063/A1063M Specification for Steel Sheet, Twin-Roll Cast, Zinc-Coated (Galvanized) by the Hot-Dip ProcessA1073/A1073M Practice for Using Hand Micrometers to Measure the Thickness of Uncoated Steel Sheet
26、and Nonmetallic andMetallic-Coated Steel SheetA1079 Specification for Steel Sheet, Complex Phase (CP), Dual Phase (DP) and Transformation Induced Plasticity (TRIP),Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip ProcessE29 Practice for Using Significant Digits in Tes
27、t Data to Determine Conformance with SpecificationsE376 Practice for Measuring Coating Thickness by Magnetic-Field or Eddy-Current (Electromagnetic) Testing Methods2.2 Federal Standard:3Fed. Std. No. 123 Marking for Shipment (Civil Agencies)3. Terminology3.1 DefinitionsFor definitions of items used
28、in this specification, refer to Terminology A902.4. Ordering Information4.1 Ordering information for all products are shown in the individual product specifications.5. Materials and Manufacture5.1 Hot-dip metallic coatings are used to provide corrosion protection to steel sheets. Hot-dip metallic co
29、atings are availablein five different types, zinc and zinc-iron alloy, aluminum, 55 % aluminum-zinc alloy, zinc-5 % aluminum alloy, andzinc-aluminum-magnesium alloy. Each coating type is available in various coating weights which provide varying degrees ofcorrosion protection and the consumer should
30、 consult the individual producers for applicability to the intended application and toobtain product information.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the
31、standards Document Summary page on the ASTM website.3 Available from Yale University Library, Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 191115094, Attn: NPODS.A924/A924M 1725.2 Hot-dip metallic coated products may be subject to changes in mechanical
32、properties after coating. As such changes arefunctions of the chemistry and processing history of the material, the consumer should consult the individual producers forapplicability to the intended application.6. Chemical Composition6.1 Base Steel:6.1.1 Chemical composition requirements of the base
33、steel are shown in the individual product specifications.6.1.2 An analysis of each heat shall be made by the manufacturer to determine the percentage of carbon, manganese,phosphorus, sulfur, and any other elements specified or restricted by the individual product specification.6.1.3 When desired, pr
34、oduct analysis shall be made by the purchaser on finished product. The product analysis so determinedshall meet the tolerances shown in Table 1.6.1.3.1 Capped or rimmed steels are not technologically suited to product analysis due to the nonuniform character of theirchemical composition, and therefo
35、re, the tolerances in Table 1 do not apply. Product analysis is appropriate on these steels onlywhen misapplication is apparent.6.1.3.2 Product analysis for phosphorus or sulfur is not technologically appropriate because of segregation of these elements innon-killed steels. Product analysis is appro
36、priate only when misapplication is apparent.6.1.3.3 Samples for product analysis shall be drillings through areas stripped free of coating. At least three pieces shall beselected, but if the product of more than one mill lift or coil is involved, at least six pieces shall be selected.6.1.3.4 When su
37、pplying High-Strength Low-Alloy Steel (HSLA), some producers use one or more microalloying elements asstrengthening agents or use alloy additions to effect inclusion control, or both. The producer shall be consulted for the specificchemical composition applied. If any alloying addition is known to b
38、e of concern to the user, the producer shall be notified of thisconcern.6.1.4 Method of AnalysisThe determination of chemical composition is permitted to be made by any test method, except incase of dispute, where the referee test methods listed in the section on test methods of Test Methods A751 sh
39、all be used.6.2 Coating:6.2.1 Coating AnalysisThe nominal composition of the coating is described in the individual product specification.6.2.2 Method of AnalysisThe determination of chemical composition shall be made in accordance with acceptable chemical,spectrochemical, or other test methods.7. T
40、ests for Mechanical Properties7.1 Test specimens shall be prepared from finished metallic-coated product.7.2 Mechanical Properties-Base MetalWhen base metal mechanical properties are specified, tests shall be conducted inaccordance with Test Methods A370. Requirements for all mechanical properties a
41、re included in the individual productspecifications.7.2.1 Tension TestsSpecimens for base-metal tension tests shall be taken longitudinally, approximately midway between thecenter and edge of the product as rolled, and shall conform to the requirements for the sheet-type test specimen in the figure
42、forrectangular tension test specimens of Test Methods A370.TABLE 1 Product Analysis TolerancesElement Limited or Maximum ofSpecified Element, %ToleranceUnderMinimumLimitOverMaximumLimitCarbon To 0.15, incl 0.02 0.03Over 0.15 to 0.40, incl 0.03 0.04Over 0.40 to 0.80, incl 0.03 0.05Manganese To 0.60,
43、incl 0.03 0.03Over 0.60 to 1.15, incl 0.04 0.04Over 1.15 to 1.65, incl 0.05 0.05Phosphorus . . . . . . 0.01Sulfur . . . . . . 0.01Silicon To 0.30, incl 0.02 0.03Over 0.30 to 0.60 0.05 0.05Copper . . . 0.02 . . .Titanium To 0.10, incl 0.01A 0.01Vanadium To 0.10, incl 0.01A 0.01Over 0.10 to 0.25, incl
44、 0.02 0.02Minimum only specified 0.01 . . .Columbium To 0.10, incl 0.01A 0.01AIf the minimum of the range is 0.01 %, the under tolerance is 0.005 %.A924/A924M 1737.2.1.1 The determination of the yield strength and tensile strength values shall be based on the as-produced base-metalthickness that sha
45、ll be obtained by one of the following methods. Unless specified in the order, the producer shall determine themethod to be used; however, in the event of a dispute the method in 7.2.1.2 shall be used.7.2.1.2 The base metal thickness shall be determined by stripping the coating from the ends of the
46、specimen contacting the gripsof the tension testing machine. The thickness measurement shall be made before testing on an end of the specimen that has beenstripped free of coating.7.2.1.3 The base metal thickness shall be determined by subtracting the coating thickness from the measured thickness of
47、 thetension test specimen. The coating thickness shall be calculated from the coating weight mass test.7.2.1.4 Two tension tests shall be made from each heat and ordered thickness for all thickness ranges of 0.020 in. 0.51 mmfor cold rolled substrate and thickness ranges of 0.050 in. 1.27 mm for hot
48、 rolled substrate. If testing is performed on a per coilbasis, only one tension test shall be required for each master coil.(1) Example: For cold rolled substrate, if ordered thickness is 0.046 in. 1.17 mm, there must be two test results within anyrange of 0.020 in. 0.51 mm, including but not limite
49、d to the following:0.026 in. through 0.046 in. 0.66 mm through 1.17 mm0.046 in. through 0.066 in. 1.17 mm through 1.68 mm0.030 in. through 0.050 in. 0.76 mm through 1.27 mm8. Tests for Coating Properties8.1 Coating Weight Mass:8.1.1 Coating weight mass shall conform to the requirements prescribed in the individual product specifications (see 1.3).8.1.2 The coating weight mass is ordered as total both sides requirements, or if requested on those product specificationspermitting it, to single side/single spot coating mass requirements.8.1.3 Tota
