1、Designation: A875/A875M 10A875/A875M 13Standard Specification forSteel Sheet, Zinc-5 % Aluminum Alloy-Coated by the Hot-DipProcess1This standard is issued under the fixed designation A875/A875M; the number immediately following the designation indicates the yearof original adoption or, in the case o
2、f 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 steel sheet, in coils and cut lengths, metallic-coated by the hot-d
3、ip process, with zinc-5 %aluminum alloy coating. The Zn-5Al alloy coating also contains small amounts of elements other than zinc and aluminum that areintended to improve processing and the characteristics of the coated product.1.2 The coating is produced as two types: zinc-5 % aluminum-mischmetal a
4、lloy (Type I) and zinc-5 % aluminum-0.1 %magnesium alloy (Type II), and in two coating structures (classes). The coated sheet is produced in several coating designations(coating weight mass).1.3 The material is intended for applications requiring corrosion resistance, formability, and paintability.1
5、.4 The steel sheet is produced in a number of designations, types, grades, and classes designed to be compatible with differingapplication requirements.1.5 Coated sheet material furnished under this specification shall conform to the applicable requirements of the latest issue ofSpecification A924/A
6、924M, unless otherwise provided herein.1.6 The text of this specification references notes and footnotes that provide explanatory material. These notes and footnotes,excluding tables and figures, shall not be considered as requirements of this specification.1.7 This specification is applicable to or
7、ders in either inch-pound units (as A875) or metric (SI) units as A875M. Values ininch-pound and SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The valuesstated in each system are not exact equivalents. Therefore, each system shall be used in
8、dependently of the other.1.8 Unless the order specifies the “M” specification designation (SI units), the material shall be furnished to inch-pound units.1.9 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
9、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 on Iron and Steel Articles with Zinc or Zinc-Alloy CoatingsA902 Terminol
10、ogy Relating to Metallic Coated Steel ProductsA924/A924M Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip ProcessB750 Specification for GALFAN (Zinc-5 % Aluminum-Mischmetal) Alloy in Ingot Form for Hot-Dip CoatingsE47 Test Methods for Chemical Analysis of Zinc D
11、ie-Casting Alloys (Withdrawn 1997)3E517 Test Method for Plastic Strain Ratio r for Sheet MetalE646 Test Method for Tensile Strain-Hardening Exponents (n -Values) of Metallic Sheet MaterialsE1277 Test Method for Chemical Analysis of Zinc-5 % Aluminum-Mischmetal Alloys by ICP Emission Spectrometry1 Th
12、is 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.Current edition approved Nov. 1, 2010April 1, 2013. Published January 2011April 2013. Originally approved in 1987.
13、 Last previous edition approved in 20092010 asA875/A875M - 09A875/A875M - 10.A. DOI: 10.1520/A0875_A0875M-10. 10.1520/A0875_A0875M-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume infor
14、mation, 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.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 ma
15、de 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 versionof the standard as published by ASTM is to be considered the official document.*A
16、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 States12.2 ISO Standard:4ISO 14788 Continuous Hot-Dip Zinc-5 % Aluminum Alloy Coated Steel Sheet and Coils2.3 Other Document:5GF-1
17、Standard Practice for Determination of Cerium and Lanthanum Compositions in Galfan Alloy (5 % Al-0.4 % La-0.4 %Ce-Bal SHG ZN)3. Terminology3.1 DefinitionsSee Terminology A902 for definitions of general terminology relating to metallic-coated steel products.3.2 Definitions of Terms Specific to This S
18、tandard:3.2.1 minimized coating structure, na coating characterized by a finer metallurgical coating structure obtained by a treatmentdesigned to restrict the formation of the normal coarse grain structure formed during solidification of the Zn-5A1 alloy coating.3.2.2 regular coating structure, nthe
19、 normal coating structure resulting from unrestricted grain growth during normalsolidification of the Zn-5Al alloy coating.3.3 Abbreviations:3.3.1 MMmischmetal.3.3.2 Zn-5A1zinc-5 % aluminum.3.3.3 Zn-5Al-Mgzinc-5 % aluminum-0.1 % magnesium.3.3.4 Zn-5Al-MMzinc-5 % aluminum-mischmetal.4. Classification
20、4.1 The material is classified in terms of the base metal and in terms of the coating.4.2 Base Metal Classifications:4.2.1 The material is available in the designations as follows:4.2.1.1 Commercial Steel (CS Types A, B, and C),4.2.1.2 Deep Drawing Steel (DDS),4.2.1.3 Extra Deep Drawing Steel (EDDS)
21、,4.2.1.4 Forming Steel (FS Types A and B),4.2.1.5 High-Strength Low-Alloy Steel (HSLAS),4.2.1.6 High-Strength Low-Alloy Steel with Improved Formability (HSLAS-F), and4.2.1.7 Structural Steel (SS).4.2.2 Structural Steel and High Strength Low Alloy Steel are available in several grades based on mechan
22、ical properties.Structural Steel Grade 50 340 is available in three classes based on tensile strength.4.3 Coating Classifications:4.3.1 The coating is available in two types, as follows:4.3.1.1 Type IZinc-5 % aluminum-mischmetal (Zn-5Al-MM), and4.3.1.2 Type IIZinc-5 % aluminum-0.1 % magnesium (Zn-5A
23、l-Mg).4.3.2 The coating is available in two coating classes, or structures, as follows:4.3.2.1 Class AMinimized coating structure, and4.3.2.2 Class BRegular coating structure.4.3.3 The coating is available in several coating designations, or weights masses of coating, as shown in Table 1.4.3.3.1 The
24、 coated sheet is available with the same or different coating designations on each surface.5. Ordering Information5.1 Zinc-5 % aluminum alloy-coated sheet in coils and cut lengths is produced to thickness requirements expressed to 0.001 in.0.01 mm. The thickness of the sheet includes both the base m
25、etal and the coating.5.2 Orders for coated sheet to this specification shall include the following information, as necessary, to adequately describe thedesired product.5.2.1 Name of material (steel sheet, Zn-5Al alloy coated),5.2.2 Designations of sheet steel CS (Type A, B, or C), FS (Type A or B),
26、DDS, EDDS, SS, HSLAS, or HSLAS-F.5.2.2.1 When a CS type is not specified, Type B will be furnished.5.2.2.2 When a FS type is not specified, Type B will be furnished.5.2.3 When a SS, HSLAS, HSLAS-F designation is specified, state the grade or combination thereof.4 Available from American National Sta
27、ndards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.5 Available from International Lead Zinc Research Organization, Inc., 2525 Meridian Parkway, P.O. Box 12036, Research Triangle Park, NC 27709-2036.A875/A875M 1325.2.4 ASTM designation number and year of issue,
28、 as A875- for inch-pound units or A875M for SI units,5.2.5 Coating type (I or II) (see 4.3.1),5.2.6 Coating designation (see 4.3.3),5.2.7 Class of coating structure (for example, Class AMinimized, etc.) (see 4.3.2),5.2.8 Chemically treated or not chemically treated,5.2.9 Oiled or not oiled,5.2.10 Ex
29、tra smooth (if required),5.2.11 Phosphatized (if required),5.2.12 Dimensions (show thickness, minimum or nominal, width, flatness requirements and length, if cut lengths).5.2.13 Coil size requirements (specify maximum outside diameter (OD), acceptable inside diameter (ID), and maximum weightmass),TA
30、BLE 1 Weight Mass of Coating Requirements A,B,CNOTE 1Use the information provided in 8.1.2 to obtain the approxi-mate coating thickness from the coating weight mass.Minimum RequirementsDTriple-Spot Test Single-Spot TestInch-Pound UnitsCoatingDesignationTotalBoth Sides, oz/ft2One Side,oz/ft2TotalBoth
31、 Sides, oz/ft2GF01 no minimum no minimum no minimumGF15 0.15 0.05 0.12GF20 0.20 0.07 0.16GF30 0.30 0.10 0.25GF45 0.45 0.14 0.35GF60 0.60 0.20 0.50GF75 0.75 0.26 0.65GF90 0.90 0.32 0.80GF115 1.15 0.40 1.00GF140 1.40 0.48 1.20GF165 1.65 0.56 1.40GF185 1.85 0.64 1.60GF210 2.10 0.72 1.80GF235 2.35 0.80
32、2.00SI UnitsCoatingDesignationTotalBoth Sides, g/m2One Side,g/m2TotalBoth Sides, g/m2ZGF001 no minimum no minimum no minimumZGF45 45 15 35ZGF60 60 20 50ZGF90 90 30 75ZGF135 135 45 113ZGF180 180 60 150ZGF225 225 78 195ZGF275 275 94 235ZGF350 350 120 300ZGF450 450 154 385ZGF600 600 204 510ZGF700 700 2
33、38 595AThe coating designation number is the term by which this material is specified.Because of the many variables and changing conditions that are characteristic ofcontinuous hot-dip coating lines, the zinc-5 % aluminum alloy coating is not alwaysevenly divided between the two surfaces of a coated
34、 sheet; nor is it always evenlydistributed from edge to edge. However, the minimum triple- spot average coatingmass on any one side shall not be less than 40 % of the single-spot requirement.BAs it is an established fact that the atmospheric corrosion resistance of zinc-5 %aluminum alloy-coated shee
35、t products is a function of coating thickness (weightmass), the selection of thinner (lighter) coating designations will result in reducedcorrosion performance of the Zn-5Al coating. For example, the heavier zinc-5 %aluminum alloy coatings perform adequately in bold atmospheric exposurewhereas the l
36、ighter coatings are often further coated with paint or a similar barriercoating for increased corrosion resistance. Because of this relationship, materialcarrying the statement “meets ASTM A875/A875Mrequirements” should alsospecify the particular coating type and designation.CThe corrosion performan
37、ce of Type I Zn-5Al-MM coated sheet products isnonlinear as the corrosion rate decreases with time, due to the formation of acharacteristic passivation layer.DNo minimum value means that there are no established minimum requirementsfor triple- and single-spot tests.A875/A875M 1335.2.14 Packaging,5.2
38、.15 Certification, if required, and heat analysis and mechanical property report,5.2.16 Application (part identification and description), and5.2.17 Special requirements (if any).5.2.17.1 When the purchaser requires thickness tolerances for 38-in. 10-mm minimum edge distance (see SupplementaryRequir
39、ement in Specification A924/A924M), this requirement shall be specified in the purchase order or contract.NOTE 1Typical ordering descriptions are as follows:Steel sheet, Zn-5Al alloy coated to ASTM A875- , Commercial SteelCS Type B, Type I coating, designation GF 115, Class A (minimized coatingstruc
40、ture), chemically treated, oiled, 0.040 min by 34 by 117 in., for stock tanks.Steel sheet, Zn-5Al alloy coated toASTM A875M- , Structural SteelSS Grade 230, Type II coating, designation ZGF 275, Class B (regular coatingstructure), chemically treated, not oiled, phosphatized, 1.00 nominal by 900 mm b
41、y coil, 1200 mm max OD, 600 mm ID, 9000 kg max, for roof deck.NOTE 2The purchaser should be aware that there are variations in manufacturing practices among the producers and therefore is advised to establishthe producers standard (or default) procedures for thickness tolerances.6. Chemical Composit
42、ion6.1 Base Metal:6.1.1 The heat analysis of the base metal shall conform to the requirements shown in Table 2 for CS (Types A, B, and C), FS(Types A and B), DDS, and EDDS; and in Table 3 for SS, HSLAS, and HSLAS-F.6.1.2 Each of the elements listed in Tables 2 and 3 shall be included in the report o
43、f heat analysis. When the amount of copper,nickel, chromium, or molybdenum is less than 0.02 %, report the analysis either as 0.02 % or the actual determined value. Whenthe amount of vanadium, titanium, or columbium is less than 0.008 %, report the analysis either as 0.008 % or the actualdetermined
44、value. When the amount of boron is less than 0.0005 %, report as 0.0005 % or the actual determined value.6.1.3 See Specification A924/A924M for cast and product analysis procedures.6.2 Coating Bath Analysis:6.2.1 The bath metal used in continuous hot-dip Zn-5A1-MM alloy coating of Type I shall meet
45、the chemical composition limitsspecified in Specification B750.6.2.2 The bath metal used in the continuous hot-dip Zn-5Al-Mg alloy coating of Type II shall conform to the requirements ofTable 4.6.3 Methods of Analysis:6.3.1 Coating Bath MetalThe determination of chemical composition shall be made in
46、 accordance with suitable chemical(Test Method E47 for tin), ICP argon plasma spectrometric (Test Method E1277), or other methods. In case of dispute, the resultssecured by Test Method E1277 shall be the basis of acceptance.6.3.1.1 A practice for X-ray fluorescence spectrometry for the determination
47、 of cerium and lanthanum in a zinc-5 %aluminum-mischmetal has been established by the International Lead Zinc Research Organization, as Practice GF-1.6.3.2 In case of dispute, the results secured by Test Method E1277 shall be the basis of acceptance.7. Mechanical Properties7.1 Structural steel, high
48、-strength low-alloy steel, and high-strength low-alloy steel with improved formability shall conform tothe mechanical property requirements of Table 5 for the grade or combination thereof.TABLE 2 Chemical RequirementsAComposition, %Heat Analysis Element, Maximum, Unless Otherwise ShownDesignation C
49、Mn P S Al Cu Ni Cr Mo V Cb TiB N BCS Type AC,D,E 0.10 0.60 0.030 0.035 . . . 0.20 0.20 0.15 0.06 0.008 0.008 0.025 . . . . . .CS Type BF,C 0.02 to 0.15 0.60 0.030 0.035 . . . 0.20 0.20 0.15 0.06 0.008 0.008 0.025 . . . . . .CS Type CC,D,E 0.08 0.60 0.10 0.035 . . . 0.20 0.20 0.15 0.06 0.008 0.008 0.025 . . . . . .FS Type AC,G 0.10 0.50 0.020 0.035 . . . 0.20 0.20 0.15 0.06 0.008 0.008 0.025 . . . . . .FS Type BF,C 0.02 to 0.10 0.50 0.020 0.030 . . . 0.20 0.20 0.15 0.06 0.008 0.008 0.025 . . . . . .DDSD,E 0.06 0.50 0.020 0.025 0.01mi
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