ASTM A924 A924M-2016a Standard Specification for General Requirements for Steel Sheet Metallic-Coated by the Hot-Dip Process《热浸处理用镀金属钢板的通用要求的标准规格》.pdf

《ASTM A924 A924M-2016a Standard Specification for General Requirements for Steel Sheet Metallic-Coated by the Hot-Dip Process《热浸处理用镀金属钢板的通用要求的标准规格》.pdf》由会员分享，可在线阅读，更多相关《ASTM A924 A924M-2016a Standard Specification for General Requirements for Steel Sheet Metallic-Coated by the Hot-Dip Process《热浸处理用镀金属钢板的通用要求的标准规格》.pdf（12页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: A924/A924M 16aStandard 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 the case of

2、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. Scope1.1 This specification covers the general requirements that,unless otherwise specified in the produc

3、t specification, apply tosteel sheet in coils and cut lengths, metallic-coated on continu-ous lines by the hot-dip process. The product is intended forapplications requiring corrosion resistance. The product speci-fications contain requirements for specific strength levels, heatresistance, paintabil

4、ity, or formability, or a combinationthereof.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 DrawingSteel (DDS), Extra Deep Drawing Steel (EDDS), High Tem-perature Steel (HTS),

5、 Structural Steel (SS), and High StrengthLow Alloy Steel (HSLAS). Steel sheet is produced with thefollowing metallic coatings. Specific information on each ofthe following is contained in the individual product specifica-tion:1.2.1 Zinc or zinc-iron alloy coated,1.2.2 Zinc-5 % aluminum alloy coated,

6、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 specifi-cation are described in the following product standards: Speci-fications A463/A463M; A653/A653M; A755/A755M; A792

7、/A792M; A875/A875M; A929/A929M; A1046/A1046M;A1057/A1057M; A1063/A1063M; and A1079.1.4 Metallic-coated steel sheet is produced to various coat-ing designations, as shown in the individual product specifica-tions. Except for differentially coated sheet, the coating isalways expressed as the total coa

8、ting of both surfaces.1.5 In case of any conflict in requirements, the requirementsof the individual product specifications shall prevail over thoseof this general specification.1.6 The purchaser is permitted to specify additional require-ments that do not negate any of the provisions of this genera

9、lspecification or of the individual product specifications. Suchadditional requirements, the acceptance of which are subject tonegotiation with the supplier, shall be included in the orderinformation.1.7 For purposes of determining conformance with thisspecification and the various product specifica

10、tions referencedin 1.3, values shall be rounded to the nearest unit in theright-hand place of figures used in expressing the limitingvalues (except to the nearest 5 MPa for SI strength values) inaccordance with the rounding method of Practice E29.1.8 Metallic-coated steel sheet covered by this speci

11、ficationis produced to thickness requirements expressed to 0.001 in.0.01 mm for both coils and cut lengths. The thickness is thetotal of the base steel and the coating.1.9 The text of this specification references notes andfootnotes that provide explanatory material. These notes andfootnotes (exclud

12、ing those in tables and figures) shall not beconsidered as requirements of the specification.1.10 The values stated in inch-pound units or SI units are tobe regarded separately as standard. Within the text, the SI unitsare shown in brackets. The values stated in each system are notexact equivalents;

13、 therefore, each system must be used inde-pendently of the other.1.11 This specification and some of the applicable productspecifications are expressed in both inch-pound and SI units.However, unless the order specifies the applicable “M” speci-fication designation (SI units), the product shall be f

14、urnished toinch-pound units.1.12 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations

15、 prior to use.1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility of Subcom-mittee A05.11 on Sheet Specifications.Current edition approved June 1, 2016. Published June 2016. Originallyapproved in 1994. Last pr

16、evious edition approved in 2016 as A924/A924M - 16.DOI: 10.1520/A0924_A0924M-16A.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States12. Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating onIron and Ste

17、el Articles with Zinc or Zinc-Alloy CoatingsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA428/A428M Test Method for Weight Mass of Coating onAluminum-Coated Iron or Steel ArticlesA463/A463M Specification for Steel Sheet, Aluminum-Coated, by the Hot-Dip ProcessA653/A653M S

18、pecification for Steel Sheet, Zinc-Coated(Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed)by the Hot-Dip ProcessA700 Guide for Packaging, Marking, and Loading Methodsfor Steel Products for ShipmentA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsA754/A754M Te

19、st Method for Coating Weight (Mass) ofMetallic Coatings on Steel by X-Ray FluorescenceA755/A755M Specification for Steel Sheet, Metallic Coatedby the Hot-Dip Process and Prepainted by the Coil-Coating Process for Exterior Exposed Building ProductsA792/A792M Specification for Steel Sheet, 55 %Aluminu

20、m-Zinc Alloy-Coated by the Hot-Dip ProcessA875/A875M Specification for Steel Sheet, Zinc-5 % Alu-minum Alloy-Coated by the Hot-Dip ProcessA902 Terminology Relating to Metallic Coated Steel Prod-uctsA929/A929M Specification for Steel Sheet, Metallic-Coatedby the Hot-Dip Process for Corrugated Steel P

21、ipeA1030/A1030M Practice for Measuring Flatness Character-istics of Steel Sheet ProductsA1046/A1046M Specification for Steel Sheet, Zinc-Aluminum-Magnesium Alloy-Coated by the Hot-Dip Pro-cessA1057/A1057M Specification for Steel, Structural Tubing,Cold Formed, Welded, Carbon, Zinc-Coated (Galvanized

22、)by the Hot-Dip ProcessA1063/A1063M Specification for Steel Sheet, Twin-RollCast, Zinc-Coated (Galvanized) by the Hot-Dip ProcessA1073/A1073M Practice for Using Hand Micrometers toMeasure the Thickness of Uncoated Steel Sheet andNonmetallic and Metallic-Coated Steel SheetA1079 Specification for Stee

23、l 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 toDetermine Conformance with SpecificationsE376 Practice for Measuri

24、ng Coating Thickness byMagnetic-Field or Eddy-Current (Electromagnetic) Test-ing Methods2.2 Federal Standard:3Fed. Std. No. 123 Marking for Shipment (Civil Agencies)3. Terminology3.1 DefinitionsFor definitions of items used in thisspecification, refer to Terminology A902.4. Ordering Information4.1 O

25、rdering information for all products are shown in theindividual product specifications.5. Materials and Manufacture5.1 Hot-dip metallic coatings are used to provide corrosionprotection to steel sheets. Hot-dip metallic coatings are avail-able in five different types, zinc and zinc-iron alloy, alumin

26、um,55 % aluminum-zinc alloy, zinc-5 % aluminum alloy, andzinc-aluminum-magnesium alloy. Each coating type is avail-able in various coating weights which provide varying degreesof corrosion protection and the consumer should consult theindividual producers for applicability to the intended applica-ti

27、on and to obtain product information.5.2 Hot-dip metallic coated products may be subject tochanges in mechanical properties after coating. As suchchanges are functions of the chemistry and processing historyof the material, the consumer should consult the individualproducers for applicability to the

28、 intended application.6. Chemical Composition6.1 Base Steel:6.1.1 Chemical composition requirements of the base steelare shown in the individual product specifications.6.1.2 An analysis of each heat shall be made by themanufacturer to determine the percentage of carbon,manganese, phosphorus, sulfur,

29、 and any other elements speci-fied or restricted by the individual product specification.6.1.3 When desired, product analysis shall be made by thepurchaser on finished product. The product analysis so deter-mined shall meet the tolerances shown in Table 1.6.1.3.1 Capped or rimmed steels are not tech

30、nologicallysuited to product analysis due to the nonuniform character oftheir chemical composition, and therefore, the tolerances inTable 1 do not apply. Product analysis is appropriate on thesesteels only when misapplication is apparent.6.1.3.2 Product analysis for phosphorus or sulfur is nottechno

31、logically appropriate because of segregation of theseelements in non-killed steels. Product analysis is appropriateonly when misapplication is apparent.6.1.3.3 Samples for product analysis shall be drillingsthrough areas stripped free of coating. At least three piecesshall be selected, but if the pr

32、oduct of more than one mill liftor 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 microalloyingelements as strengthening agents or use alloy additions to effect2For referenced ASTM standards, visit th

33、e ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Yale University Library, Standardization Documents OrderDesk, Bldg. 4 Section D, 700

34、Robbins Ave., Philadelphia, PA 191115094, Attn:NPODS.A924/A924M 16a2inclusion control, or both. The producer shall be consulted forthe specific chemical composition applied. If any alloyingaddition is known to be of concern to the user, the producershall be notified of this concern.6.1.4 Method of A

35、nalysisThe determination of chemicalcomposition is permitted to be made by any test method,except in case of dispute, where the referee test methods listedin the section on test methods of Test Methods A751 shall beused.6.2 Coating:6.2.1 Coating AnalysisThe nominal composition of thecoating is descr

36、ibed in the individual product specification.6.2.2 Method of AnalysisThe determination of chemicalcomposition shall be made in accordance with acceptablechemical, spectrochemical, or other test methods.7. Tests for Mechanical Properties7.1 Test specimens shall be prepared from finished metallic-coat

37、ed product.7.2 Mechanical Properties-Base MetalWhen base metalmechanical properties are specified, tests shall be conducted inaccordance with Test Methods A370. Requirements for allmechanical properties are included in the individual productspecifications.7.2.1 Tension TestsSpecimens for base-metal

38、tension testsshall be taken longitudinally, approximately midway betweenthe center and edge of the product as rolled, and shall conformto the requirements for the sheet-type test specimen in thefigure for rectangular tension test specimens of Test MethodsA370.7.2.1.1 The determination of the yield s

39、trength and tensilestrength values shall be based on the as-produced base-metalthickness that shall be obtained by one of the followingmethods. Unless specified in the order, the producer shalldetermine the method to be used; however, in the event of adispute the method in 7.2.1.2 shall be used.7.2.

40、1.2 The base metal thickness shall be determined bystripping the coating from the ends of the specimen contactingthe grips of the tension testing machine. The thickness mea-surement shall be made before testing on an end of thespecimen that has been stripped free of coating.7.2.1.3 The base metal th

41、ickness shall be determined bysubtracting the coating thickness from the measured thicknessof the tension test specimen. The coating thickness shall becalculated from the coating weight mass test.7.2.1.4 Two tension tests shall be made from each heat andordered thickness for all thickness ranges of

42、0.020 in.0.51 mm for cold rolled substrate and thickness ranges of0.050 in. 1.27 mm for hot rolled substrate. If testing isperformed on a per coil basis, only one tension test shall berequired for each master coil.(1) Example: For cold rolled substrate, if ordered thicknessis 0.046 in. 1.17 mm, ther

43、e must be two test results within anyrange of 0.020 in. 0.51 mm, including but not limited to thefollowing: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 Coati

44、ng Weight Mass:8.1.1 Coating weight mass shall conform to the require-ments prescribed in the individual product specifications (see1.3).8.1.2 The coating weight mass is ordered as total bothsides requirements, or if requested on those product specifica-tions permitting it, to single side/single spo

45、t coating massrequirements.8.1.3 Total both sides requirements8.1.3.1 The coating weight mass of equally coated productis the total amount on both sides of the sheet, expressed inounces per square foot grams per square metre of sheet.8.1.3.2 For differentially coated product, the coating weightmass

46、on each surface is nominally one half of the statedcoating designation.8.1.4 Single side/single spot requirements8.1.4.1 The coating mass for each surface shall be specifiedseparately, for example, 60G60G, and each single spot testshall meet the specified requirements for the coating designa-tion.8.

47、2 Coating Weight Mass TestsOne of the following testmethods shall be used:8.3 Weigh-Strip-Weigh Method:8.3.1 The weigh-strip-weigh method, described in TestMethods A90/A90M and A428/A428M, is a destructive testthat determines coating weight mass by measuring thedifference in weight mass between a co

48、ated and a stripped(uncoated) sample. If one surface is protected suitably duringthe initial stripping, coating weight mass can be determinedfor each surface independently.8.3.2 Test specimens for product over 18 in. 450 mm inwidth shall be taken from a representative sample pieceapproximately 1 ft

49、300 mm in length by the associated width.Three test specimens shall be taken from the sample, one fromthe middle of the width and one from each edge. The edgeTABLE 1 Product Analysis TolerancesElementLimited 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, 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,