1、Designation: A 792/A 792M 09Standard Specification forSteel Sheet, 55 % Aluminum-Zinc Alloy-Coated by the Hot-Dip Process1This standard is issued under the fixed designation A 792/A 792M; the number immediately following the designation indicates the yearof original adoption or, in the case of revis
2、ion, 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This specification
3、covers 55 % aluminum-zinc alloy-coated steel sheet in coils and cut lengths.1.2 This product is intended for applications requiringcorrosion resistance or heat resistance, or both.1.3 The product is produced in a number of designations,types, and grades which are designed to be compatible withdiffer
4、ing application requirements.1.4 Product furnished under this specification shall conformto the applicable requirements of the latest issue of Specifica-tion A 924/A 924M, unless otherwise provided herein.1.5 This specification is applicable to orders in eitherinch-pound units (as A 792) or SI units
5、 (as A 792M). Values ininch-pound and SI units are not necessarily equivalent. Withinthe text, SI units are shown in brackets. Each system shall beused independent of the other.1.6 Unless the order specifies the “M” designation (SIunits), the product shall be furnished to inch-pound units.1.7 The te
6、xt of this specification references notes andfootnotes that provide explanatory material. These notes andfootnotes, excluding those in tables and figures, shall not beconsidered as requirements of this specification.1.8 This standard does not purport to address all of thesafety concerns, if any, ass
7、ociated 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 prior to use.2. Referenced Documents2.1 ASTM Standards:2A 90/A 90M Test Method for Weight Mass of Coating onIron
8、 and Steel Articles with Zinc or Zinc-Alloy CoatingsA 568/A 568M Specification for Steel, Sheet, Carbon,Structural, and High-Strength, Low-Alloy, Hot-Rolled andCold-Rolled, General Requirements forA 902 Terminology Relating to Metallic Coated Steel Prod-uctsA 924/A 924M Specification for General Req
9、uirements forSteel Sheet, Metallic-Coated by the Hot-Dip ProcessE 517 Test Method for Plastic Strain Ratio r for Sheet MetalE 646 Test Method for Tensile Strain-Hardening Exponents(n -Values) of Metallic Sheet Materials3. Terminology3.1 DefinitionsSee Terminology A 902 for definitions ofgeneral term
10、inology relating to metallic-coated hot-dip prod-ucts.3.2 Definitions of Terms Specific to This Standard:3.2.1 regular spanglethe unaltered 55 % aluminum-zinc(Al-Zn) crystal structure that occurs during normal solidifica-tion of a hot-dip coated steel sheet.3.2.2 high temperature steela product inte
11、nded for use inelevated temperature applications.4. Classification4.1 The material is available in several designations, asfollows:4.1.1 Commercial SteelCS Types A, B, and C,4.1.2 Forming SteelFS,4.1.3 Drawing SteelDS,4.1.4 High Temperature SteelHTS, and4.1.5 Structural SteelSS.4.2 Structural steel
12、is available in several grades based onmechanical properties. Structural Steel Grade 50 340 isavailable in three classes based on tensile strength. StructuralSteel Grade 80 550 is available in two classes, based onchemistry.1This specification is under the jurisdiction of ASTM Committee A05 onMetall
13、ic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.11 on Sheet Specifications.Current edition approved May 1, 2009. Published June 2009. Originallyapproved in 1983. Last previous edition approved in 2006 as A 792/A 792M 08.2For referenced ASTM standards, visit the
14、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.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Ba
15、rr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.3 The product is available in several coating weightsmasses with the coating designation in accordance with Table1.5. Ordering Information5.1 55 % aluminum-zinc alloy-coated steel sheet in coilsand cut lengths is produce
16、d to thickness requirements ex-pressed to 0.001 in. 0.01 mm. The thickness of the sheetincludes the base metal and the coating.5.2 Orders for product to this specification shall include thefollowing information, as necessary, to adequately describe thedesired product.5.2.1 Name of product (steel she
17、et, 55 % aluminum-zincalloy coated),5.2.2 Designation of sheet steel CS (Type A, B, or C), FS,DS, HTS, or SS.5.2.2.1 When a CS type is not specified, Type B will befurnished.5.2.3 Strength grade as required for Structural Steel,5.2.4 ASTM designation number and year of issue, such asA 792 for inch-p
18、ound units or A 792M for SIunits,5.2.5 Coating designation,5.2.6 Chemically treated or not chemically treated,5.2.7 Oiled or not oiled,5.2.8 Dimensions (show thickness, width, flatness require-ments (if appropriate), and length (if cut length). The pur-chaser shall specify the appropriate table of t
19、hickness toler-ances in Specification A 924/A 924M that applies to the order,that is, the table of thickness tolerances for38-in. 10-mmedge distance, or the table of thickness tolerances for 1-in.25-mm edge distance.5.2.9 Coil size requirements (specify maximum outsidediameter (OD), acceptable insid
20、e diameter (ID), and maximumweight mass),5.2.10 Packaging,5.2.11 Certification, if required, and heat analysis and me-chanical property report,5.2.12 Application (show part identification and descrip-tion), and5.2.13 Special requirements (if any).5.2.13.1 If required, the product may be ordered to a
21、specified base metal thickness. See Supplementary Require-ment S1.NOTE 1Typical ordering descriptions are as follows:Steel sheet, 55 % aluminum-zinc alloy-coated, Forming Steel (FS),ASTM A 792 , coating designation AZ55, chemical treatment, nooil, minimum 0.035 by 36 in. by coil, 48-in. maximum OD,
22、24-in. ID,10 000-lb maximum, for muffler wrappers.Steel sheet, 55 % aluminum-zinc alloy-coated, Commercial Steel (CSType A), ASTM A 792M , coating designation AZM150, chemicaltreatment, no oil, minimum 0.90 by 900 mm by coil, 1200-mm maximumOD, 600-mm ID, 4500-kg maximum, for building panels.6. Chem
23、ical Composition6.1 Base Metal:6.1.1 The heat analysis of the base metal shall conform tothe requirements of Table 2 for CS (Types A, B, and C), FS,DS, HTS, Table 3 for SS.6.1.2 Include each of the elements listed in Tables 2 and 3 inthe report of heat analysis. When the amount of copper, nickel,chr
24、omium, or molybdenum is less than 0.02 %, report theanalysis either as 0.02 % or the actual determined value.When the amount of vanadium, titanium, or columbium is lessthan 0.008 %, report the analysis either as 0.008 % or theactual determined value. When the amount of boron is less than0.0005 %, re
25、port as 0.0005 % or the actual determined value.6.2 Coating CompositionThe 55 % aluminum-zinc alloycoating composition, by weight, is nominally 55 % aluminum,1.6 % silicon, and the balance zinc.7. Mechanical Properties7.1 Structural Steel sheet shall conform to the mechanicalproperty requirements of
26、 Table 4 for the grade specified.7.2 The typical mechanical properties for CS (Types A, B,and C), FS, DS, and HTS are listed in Table 5. These typicalmechanical properties are nonmandatory. They are intendedsolely to provide the purchaser with as much information aspossible to make an informed decis
27、ion on the steel to bespecified. Values outside these ranges are to be expected.7.3 All tests for mechanical properties shall be conducted inaccordance with the methods described in Specification A 924/A 924M.7.4 Bending Properties:7.4.1 Minimum Inside Radii for Cold BendingStructuralSteel sheet is
28、commonly fabricated by cold bending. There aremany interrelated factors that affect the ability of a steel to coldform over a given radius under shop conditions. These factorsTABLE 1 Weight Mass of Coating RequirementsANOTE 1Use the information provided in 8.1.2 to obtain the approxi-mate coating th
29、ickness from the coating weight mass.NOTE 2When considering material with coating designation less thanAZ50 AZM150, users are advised to discuss the intended applicationwith the manufacturer to determine if the product is appropriate for theend use.Minimum RequirementsTriple-Spot Test Single-Spot Te
30、stInch-Pound UnitsCoating Designation Total Both Sides, oz/ft2Total Both Sides, oz/ft2AZ30 0.30 0.26AZ35 0.35 0.30AZ40 0.40 0.35AZ50 0.50 0.43AZ55 0.55 0.50AZ60 0.60 0.52AZ70 0.70 0.60Minimum RequirementsTriple-Spot Test Single-Spot TestSI UnitsCoating Designation Total Both Sides, g/m2Total Both Si
31、des, g/m2AZM100 100 85AZM110 110 95AZM120 120 105AZM150 150 130AZM165 165 150AZM180 180 155AZM210 210 180AThe coating designation number is the term by which this product is specified.Because of the many variables and changing conditions that are characteristic ofcontinuous hot-dip coating lines, th
32、e weight mass of the coating is not alwaysevenly divided between the two surfaces of a sheet, nor is the coating evenlydistributed from edge to edge. However, it can normally be expected that not lessthan 40 % of the single-spot test limit will be found on either surface.A 792/A 792M 092include thic
33、kness, strength level, degree of restraint, relation-ship to rolling direction, chemistry, and base metal microstruc-ture. Table X2.1 lists the suggested minimum inside radii for90 cold bending for Structural Steels. They presuppose “hardway” bending (bend axis parallel to the rolling direction) and
34、reasonably good shop forming practices. Where possible, theuse of larger radii or “easy way” bends are recommended forimproved performance.7.4.2 Fabricators should be aware that cracks may initiateupon bending a sheared or cold-worked edge. This is notconsidered to be a fault of the steel but is rat
35、her a function ofthe induced localized cold-work zone.8. Coating Properties8.1 Coating Weight Mass8.1.1 Coating weight mass shall conform to the require-ments as shown in Table 1 for the specific coating designation.8.1.2 Use the following relationships to estimate the coatingthickness from the coat
36、ing weight mass:8.1.2.1 1 oz /ft2coating weight = 3.2 mils coating thickness,and8.1.2.2 3.75 g/m2coating mass=1mcoating thickness8.1.3 Use the following relationship to convert coatingweight to coating mass:8.1.3.1 1 oz/ft2coating weight = 305.15 g/m2coating mass8.2 Coating Weight Mass Tests:8.2.1 C
37、oating weight mass tests shall be performed inaccordance with the requirements stated in SpecificationA 924/A 924M.8.2.2 The referee method to be used shall be the dilutehydrochloric acid method, in Test Method A 90/A 90M.8.3 Coating Bend TestThe coating bend test specimensfor all designations other
38、 than Structural Steel shall be capableof being bent through 180 flat on itself in any directionwithout flaking on the outside of the bend only. For StructuralSteel, the coating bend test inside diameter shall have a relationto the thickness of the specimen as shown in Table 6. Flakingof the coating
39、 within 0.25 in. 6 mm of the edge of the bendspecimen shall not be cause for rejection.9. Retests and Disposition of Non-Conforming Material9.1 Retests, conducted in accordance with the requirementsof the section on Retests and Disposition of Non-ConformingMaterial of Specification A 924/A 924M, are
40、 permitted whenan unsatisfactory test result is suspected to be the consequenceof the test method procedure.9.2 Disposition of non-conforming material shall be subjectto the requirements of 9.2 of Specification A 924/A 924M.10. Dimensions and Permissible Variations10.1 All dimensions and permissible
41、 variations shall com-ply with the requirements of Specification A 924/A 924M.TABLE 2 Chemical RequirementsAComposition, %Heat Analysis Element, Maximum, Unless Otherwise ShownDesignation C Mn P S Al Cu Ni Cr Mo V Cb TiBNBCS Type AC,D,E0.10 0.60 0.030 0.035 . 0.25 0.20 0.15 0.06 0.008 0.008 0.025 .
42、.CS Type BC,F0.02 to 0.15 0.60 0.030 0.035 . 0.25 0.20 0.15 0.06 0.008 0.008 0.025 . .CS Type CC,D,E0.08 0.60 0.10 0.035 . 0.25 0.20 0.15 0.06 0.008 0.008 0.025 . .FSC,G0.02 to 0.10 0.50 0.020 0.030 . 0.25 0.20 0.15 0.06 0.008 0.008 0.025 . .DSD,E0.06 0.50 0.020 0.025 0.01, min 0.25 0.20 0.15 0.06 0
43、.008 0.008 0.025 . .HTSC0.02 to 0.15 0.60 0.040, min 0.035 . 0.25 0.20 0.15 0.06 0.008 0.008 0.025 . .AWhere an ellipsis (. . .) appears in the table, there is no requirement, but the analysis result shall be reported.BFor steels containing more than 0.02 % carbon, titanium is permitted at the produ
44、cers option, to the lesser of 3.4N + 1.5S or 0.025 %, for the purpose of stabilization.CWhen a deoxidized steel is required for the application, the purchaser has the option to order CS, FS, and HTS to a minimum of 0.01 % total aluminum.DSteel is permitted to be furnished as a vacuum degassed or che
45、mically stabilized steel, or both, at producers option.EFor carbon levels less than or equal to 0.02 %, vanadium, columbium, or titanium, or combinations thereof are permitted to be used as stabilizing elements at producersoption. In such cases, the applicable limit for vanadium and columbium shall
46、be 0.10 % max. and the limit for titanium shall be 0.15 % max.FFor CS, specify Type B to avoid carbon levels below 0.02 %.GShall not be furnished as a stabilized steel.TABLE 3 Chemical RequirementsComposition, %Heat Analysis Element, maximum, Unless Otherwise ShownDesignation C Mn P S Cu Ni Cr Mo V
47、Cb TiANBStructural Steel:Grade 33 230 0.20 1.35 0.04 0.040 0.25 0.20 0.15 0.06 0.008 0.008 0.025 .Grade 37 255 0.20 1.35 0.10 0.040 0.25 0.20 0.15 0.06 0.008 0.008 0.025 .Grade 40 275 0.25 1.35 0.10 0.040 0.25 0.20 0.15 0.06 0.008 0.008 0.025 .Grade 50 Class 1, Class 2,and Class 4 340 Class 1,Class
48、2, and Class 40.25 1.35 0.20 0.040 0.25 0.20 0.15 0.06 0.008 0.008 0.025 .Grade 60 410 0.25 1.35 0.20 0.040 0.25 0.20 0.15 0.06 0.008 0.008 0.025 .Grade 70 480 0.25 1.35 0.20 0.040 0.25 0.20 0.15 0.06 0.008 0.008 0.025 .Grade 80 550 Class 1 0.20 1.35 0.04 0.040 0.25 0.20 0.15 0.06 0.008 0.015 0.025
49、.Grade 80 550 Class 2C0.02 1.35 0.05 0.020 0.25 0.20 0.15 0.06 0.10 0.10 0.15 .Grade 80 550 Class 3 0.20 1.35 0.04 0.040 0.25 0.20 0.15 0.06 0.008 0.015 0.025 .ATitanium is permitted at the producers option, to the lesser of 3.4N + 1.5S or 0.025 %, for the purpose of stabilization.BWhere an ellipsis (. . .) appears in the table, there is no requirement, but the analysis shall be reported.CShall be furnished as a stabilized steel.A 792/A 792M 09311. Keywords11.1 coatings, metallic; 55 % alumin
