1、Designation: A924/A924M 141A924/A924M 16Standard 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 NOTEIn Table 5, footnotes A and B, reference to Table 14 was corrected to Table 15 in April 2
3、016.1. Scope*1.1 This specification covers 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 res
4、istance. The product specifications contain 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
5、(FS), Drawing Steel (DS), Deep Drawing 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
6、in the individual product specification:1.2.1 Zinc or zinc-iron alloy coated,1.2.2 Zinc-5 % aluminum alloy coated,1.2.3 55 % aluminumzincaluminum-zinc alloy coated,1.2.4 Aluminumcoated,Aluminum or aluminum-silicon alloy coated,1.2.5 Terne (lead-tin alloy) coated, and1.2.6 Zinc-aluminum-magnesium all
7、oy coated.1.3 Products covered by this general requirements specification are described in the following product standards: SpecificationsA308/A308M; A463/A463M; A653/A653M; A755/A755M; A792/A792M; A875/A875M; A929/A929M; A1046/A1046M;A1057/A1057M; A1063/A1063M; and A1079.1.4 Metallic-coated steel s
8、heet is produced to various coating designations, as shown in the individual product specifications.Except for differentially 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 sp
9、ecifications shall prevail over those ofthis general specification.1.6 The purchaser is permitted to specify additional requirements that do not negate any of the provisions of this generalspecification or of the individual product specifications. Such additional requirements, the acceptance of whic
10、h are subject tonegotiation with the supplier, shall be included in the order information.1.7 For purposes of determining 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 i
11、n expressing the limiting values (except to thenearest 5 MPa for SI strength values) in accordance with the rounding 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
12、. 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 explanatory material. These notes and footnotes(excluding those in tables and figures) shall not be considered as requirements of the specification.1.10 The v
13、alues 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 stated in each system are not exact equivalents; therefore, each system must be usedindependently of the other.1 This specification is under the juri
14、sdiction ofASTM Committee A05 on Metallic-Coated Iron and Steel Products and is the direct responsibility of Subcommittee A05.11on Sheet Specifications.Current edition approved Oct. 1, 2014May 1, 2016. Published October 2014May 2016. Originally approved in 1994. Last previous edition approved in 201
15、32014 asA924/A924M - 13.A924/A924M - 14. DOI: 10.1520/A0924_A0924M-14E01.10.1520/A0924_A0924M-16.This document is not an 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 p
16、ossible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. 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 standard
17、Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States11.11 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” specificati
18、on 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, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and deter
19、mine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating 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 Pr
20、ocess (Withdrawn 2015)3A309 Test Method for Weight and Composition of Coating on Terne Sheet by the Triple-Spot Test (Withdrawn 2015)3A370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA428/A428M Test Method for Weight Mass of Coating on Aluminum-Coated Iron or Steel ArticlesA
21、463/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) by theHot-Dip ProcessA700 Guide for Packaging, Marking, and Loading Methods for Steel Products for ShipmentA751
22、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 FluorescenceA755/A755M Specification for Steel Sheet, Metallic Coated by the Hot-Dip Process and Prepainted by the Coil-Coating Proc
23、essfor 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-5 % Aluminum Alloy-Coated by the Hot-Dip ProcessA902 Terminology Relating to Metallic Coated Steel ProductsA929/A929
24、M Specification for Steel 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 Spe
25、cification for Steel, 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
26、Uncoated Steel Sheet 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 Sign
27、ificant Digits in Test Data to Determine Conformance with SpecificationsE376 Practice for Measuring Coating Thickness by Magnetic-Field or Eddy-Current (Electromagnetic) Testing Methods2.2 Federal Standard:4Fed. Std. No. 123 Marking for Shipment (Civil Agencies)3. Terminology3.1 DefinitionsFor defin
28、itions of items used 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
29、. Hot-dip metallic coatings 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
30、corrosion protection and the consumer should consult the individual producers for applicability to the intendedapplication and to obtain product information.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of AST
31、M Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 The last approved version of this historical standard is referenced on www.astm.org.4 Available from Yale University Library, Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., P
32、hiladelphia, PA 191115094, Attn: NPODS.A924/A924M 1625.2 Hot-dip metallic coated products may be subject to changes in mechanical properties after coating. As such changes arefunctions of the chemistry and processing history of the material, the consumer should consult the individual producers forap
33、plicability to the intended application.6. Chemical Composition6.1 Base Steel:6.1.1 Chemical composition requirements 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
34、,phosphorus, sulfur, and any other elements specified or restricted by the individual product specification.6.1.3 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 s
35、teels are not technologically suited to product analysis due to the nonuniform character of theirchemical composition, 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
36、 sulfur is not technologically appropriate because of segregation of these elements innon-killed steels. Product 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 be
37、selected, 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 supplying High-Strength Low-Alloy Steel (HSLA), some producers use one or more microalloying elements asstrengthening agents or use alloy additions to effect inclusion cont
38、rol, or both. The producer shall be consulted for the specificchemical composition applied. If any alloying addition 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 t
39、est method, except incase of dispute, where the referee test methods listed in the section on test methods of Test 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 dete
40、rmination of chemical composition shall be made in accordance with acceptable chemical,spectrochemical, or other 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 pr
41、operties are specified, tests shall be conducted inaccordance with Test Methods A370. Requirements for all mechanical properties are included in the individual productspecifications.7.2.1 Tension TestsSpecimens for base-metal tension tests shall be taken longitudinally, approximately midway between
42、thecenter and edge of the product as rolled, and shall conform to the requirements for the sheet-type test specimen in the figure forrectangular tension test specimens of Test Methods A370.TABLE 1 Product Analysis TolerancesElement Limited or Maximum ofSpecified Element, %ToleranceUnderMinimumLimitO
43、verMaximumLimitCarbon 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, 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
44、 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 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 1637.2.1.1
45、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 producer shall determine themethod to be used; however, in the event of a dispute the m
46、ethod 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 shall be made before testing on an end of the specimen that has beenstripped free o
47、f coating.7.2.1.3 The base metal thickness shall be determined by subtracting the coating thickness from the measured thickness of 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
48、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 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 ord
49、ered 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 limited 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 require
