1、Designation: A924/A924M 10aA924/A924M 13Standard 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, in
2、 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. Scope*1.1 This specification covers the general requirements that, unless otherwise specifie
3、d 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 contain requirements for specific strength levels, heat resista
4、nce,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 Drawing Steel (DDS), Extra Deep Drawing Steel (EDDS), High Temperatu
5、re 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 specification:1.2.1 Zinc or zinc-iron alloy coated,1.2.2 Zinc-5 % aluminu
6、m alloy coated,1.2.3 55 % aluminumzinc alloy coated,1.2.4 Aluminumcoated,1.2.5 Terne (lead-tin alloy) coated, and1.2.6 Zinc-aluminum-magnesium alloy coated.1.3 Products covered by this general requirements specification are described in the following product standards: SpecificationsA308/A308M; A463
7、/A463M; A653/A653M; A755/A755M; A792/A792M; A875/A875M; A929/A929M; A1046/A1046M;A1057/A1057Mand; 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 differentially coated sheet, the coating
8、 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 additional requirements that do not negate
9、 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 determining conformance with this specifi
10、cation 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 method of Practice E29.1.8 Metalli
11、c-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 and footnotes that provide explanato
12、ry 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 unitsare shown in brackets. The values
13、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 Subcommittee A05.11on Sheet Specifications
14、.Current edition approved Nov. 1, 2010April 1, 2013. Published January 2011April 2013. Originally approved in 1994. Last previous edition approved in 2010 asA924/A924M - 10.A924/A924M - 10a. DOI: 10.1520/A0924_A0924M-10A. 10.1520/A0924_A0924M-13.This document is not an ASTM standard and is intended
15、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. In all cases only the current ve
16、rsionof 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 This specification and some of t
17、he 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 address all of the safety concerns,
18、 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.2. Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating
19、 on Iron and Steel Articles with Zinc or Zinc-Alloy CoatingsA308/A308M Specification for Steel Sheet, Terne (Lead-Tin Alloy) Coated by the Hot-Dip ProcessA309 Test Method for Weight and Composition of Coating on Terne Sheet by the Triple-Spot TestA370 Test Methods and Definitions for Mechanical Test
20、ing of Steel ProductsA428/A428M Test Method for Weight Mass of Coating on Aluminum-Coated Iron or Steel ArticlesA463/A463M Specification for Steel Sheet, Aluminum-Coated, by the Hot-Dip ProcessA653/A653M Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)
21、 by theHot-Dip ProcessA700 Practices for Packaging, Marking, and Loading Methods for Steel Products for ShipmentA751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel ProductsA754/A754M Test Method for Coating Weight (Mass) of Metallic Coatings on Steel by X-Ray FluorescenceA75
22、5/A755M Specification for Steel Sheet, Metallic Coated by the Hot-Dip Process and Prepainted by the Coil-Coating Processfor Exterior Exposed Building ProductsA792/A792M Specification for Steel Sheet, 55 % Aluminum-Zinc Alloy-Coated by the Hot-Dip ProcessA875/A875M Specification for Steel Sheet, Zinc
23、-5 % Aluminum Alloy-Coated by the Hot-Dip ProcessA902 Terminology Relating to Metallic Coated Steel ProductsA929/A929M Specification for Steel Sheet, Metallic-Coated by the Hot-Dip Process for Corrugated Steel PipeA1030/A1030M Practice for Measuring Flatness Characteristics of Steel Sheet ProductsA1
24、046/A1046M Specification for Steel Sheet, Zinc-Aluminum-Magnesium Alloy-Coated by the Hot-Dip ProcessA1057/A1057M Specification for Steel, Structural Tubing, Cold Formed, Welded, Carbon, Zinc-Coated (Galvanized) by theHot-Dip ProcessA1063/A1063M Specification for Steel Sheet, Twin-Roll Cast, Zinc-Co
25、ated (Galvanized) by the Hot-Dip ProcessA1079 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 Test Data
26、 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 in thi
27、s 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 coatings
28、 are availablein six different types, zinc and zinc-iron alloy, lead-tin alloy (Terne), aluminum, 55 % aluminum-zinc alloy, zinc-5 % aluminumalloy, and zinc-aluminum-magnesium alloy. Each coating type is available in various coating weights which provide varyingdegrees of corrosion protection and th
29、e consumer should consult the individual producers for applicability to the intendedapplication and to obtain product information.5.2 Hot-dip metallic coated products may be subject to changes in mechanical properties after coating. As such changes arefunctions of the chemistry and processing histor
30、y of the material, the consumer should consult the individual producers forapplicability to the intended application.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
31、the 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 1326. Chemical Composition6.1 Base Steel:6.1.1 Chemical composition requirem
32、ents of the base 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
33、 When desired, product 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 composi
34、tion, and therefore, 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
35、analysis is appropriate 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 selecte
36、d.6.1.3.4 When supplying 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 addit
37、ion is known to be 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 Tes
38、t Methods A751 shall 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
39、test methods.7. Tests 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 mechan
40、ical properties are 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 specim
41、en in the figure forrectangular tension test specimens of Test Methods A370.7.2.1.1 The determination of the yield strength and tensile strength values shall be based on the as-produced base-metalthickness that shall be obtained by one of the following methods. Unless specified in the order, the pro
42、ducer 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 specimen contacting the gripsof the tension testing machine. The thickness measurement
43、 shall be made before testing on an end of the specimen that has beenstripped free of coating.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
44、, incl 0.03 0.05Manganese To 0.60, 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, inc
45、l 0.01A 0.01Over 0.10 to 0.25, incl 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 1337.2.1.3 The base metal thickness shall be determined by subtracting the coating thickness from the meas
46、ured thickness of thetension test specimen. The coating thickness shall be calculated from the coating weight mass test.8. 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
47、.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 Total both sides requirements8.1.3.1 The coating weight mass of equally coated product is the total amount
48、on both sides of the sheet, expressed in ouncesper square foot grams per square metre of sheet.8.1.3.2 For differentially coated product, the coating weight mass on each surface is nominally one half of the stated coatingdesignation.8.1.4 Single side/single spot requirements8.1.4.1 The coating mass
49、for each surface shall be specified separately, for example, 60G60G, and each single spot test shallmeet the specified requirements for the coating designation.8.2 Coating Weight Mass TestsOne of the following test methods shall be used:8.3 Weigh-Strip-Weigh Method:8.3.1 The weigh-strip-weigh method, described in Test Methods A90/A90M, A309, and A428/A428M, is a destructive test thatdetermines coating weight mass by measuring the difference in weight mass between a coated and a stripped (uncoated) sample.If one surface is protected suitably duri
