1、Designation: A879/A879M 12 (Reapproved 2017)Standard Specification forSteel Sheet, Zinc Coated by the Electrolytic Process forApplications Requiring Designation of the Coating Mass onEach Surface1This standard is issued under the fixed designation A879/A879M; the number immediately following the des
2、ignation indicates the yearof original adoption or, in 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. Scope1.1 This specification covers zin
3、c coatings applied by theelectrolytic process to hot-rolled and cold-rolled steel sheet.The coating has a smooth, spangle-free surface. The zinc-coated sheet covered in this specification is produced in a widerange of coating masses to provide coatings that are compatiblewith the anticipated service
4、 life required. The coating massvaries, from very thin coatings that are usually painted toprovide good service, to relatively heavy masses that providegood corrosion resistance in the bare (unpainted) condition.1.2 The product shall be coated on one or both surfaces withequal or differential coatin
5、g masses on the two surfaces. Sheetcoated with equal coating masses on each surface has similarlevels of corrosion protection on each surface. Often, however,a higher level of corrosion protection is required on one surfacethan is required on the other. Thus one surface is specified tohave a heavier
6、 coating mass than the other. Either surface,when specified to be painted will provide additional corrosionprotection as compared to an unpainted surface.1.3 This coating process has essentially no effect on the basemetal mechanical properties and use is permitted on any gradeof hot- or cold-rolled
7、steel sheet. The coated sheet is availableas Commercial Steel (CS), Drawing Steel (DS), Deep DrawingSteel (DDS), Extra-Deep Drawing Steel (EDDS), StructuralSteel (SS), High-Strength Low-Alloy Steel (HSLAS), High-Strength Low-Alloy Steel with Improved Formability(HSLAS-F), Solution-Hardened Steel (SH
8、S), or Bake-Hardenable Steel (BHS), see Specifications A1008/A1008Mand A1011/A1011M.1.4 The values stated in either SI or inch-pound units are tobe regarded separately as the standard. Within the text, the SIunits are shown in brackets. The values stated in each systemare not exact equivalents; ther
9、efore, each system must be usedindependently of the other.2. Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA754/A754M Test Method for Coating Weight (Mass) ofMetallic Coatings on Steel by X-Ray Fluore
10、scenceA917 Specification for Steel Sheet, Coated by the Electro-lytic Process for Applications Requiring Designation ofthe Coating Mass on Each Surface (General Require-ments)A1008/A1008M Specification for Steel, Sheet, Cold-Rolled,Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy
11、 with Improved Formability, SolutionHardened, and Bake HardenableA1011/A1011M Specification for Steel, Sheet and Strip,Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy, High-Strength Low-Alloy with ImprovedFormability, and Ultra-High StrengthB504 Test Method for Measurement of Thickness of Me
12、tal-lic Coatings by the Coulometric Method3. Classification3.1 Coating shall be designated in accordance with Speci-fication A917. The letter G shall be used to designate SI unitsof pure zinc coatings. The letter Z shall be used to designateinch-pound units of pure zinc coating.4. Ordering Informati
13、on4.1 Orders for products to this specification shall include thefollowing information, as necessary to adequately describe thedesired product:4.1.1 Name of product (electrolytic zinc-coated steel sheet).4.1.2 ASTM designation and year of issue.4.1.3 Base metal type (hot rolled or cold rolled).4.1.4
14、 Base metal designation (Commercial Steel (CS),Drawing Steel (DS), Deep Drawing Steel (DDS), Extra Deep1This 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.Curren
15、t edition approved Feb. 1, 2017. Published February 2017. Originallyapproved in 1987. Last previous edition approved in 2012 as A879/A879M - 12.DOI: 10.1520/A0879_A0879M-12R17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. Fo
16、r Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internation
17、ally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1Drawing Steel (EDDS), Structural Steel (SS), High-Stre
18、ngthLow-Alloy Steel (HSLAS), High-Strength Low-Alloy Steelwith Improved Formability (HSLAS-F), Solution-HardenedSteel (SHS), or Bake-Hardenable Steel (BHS).4.1.5 Formability type, strength, grade or class, orcombination, thereof, as required for structural or high-strengthlow-alloy steels.4.1.6 Coat
19、ing designation (see 3.1).4.1.7 Surface treatments required (see Note 1).NOTE 1Steel sheet is available without surface treatment (dry) or withsurface treatments designated as chemical treatment, oiled, or phos-phatized. Unless otherwise specified sheet is furnished oiled.4.1.8 Dimensions show thick
20、ness (minimum or nominal),width, and length, if cut length.4.1.9 Coil size requirements (specify maximum outsidediameter (OD), acceptable inside diameter (ID), and maximumweight (mass).4.1.10 Application (part name and description).4.1.11 Special Requirements, if applicable.4.1.12 Certification, if
21、required, heat analysis and mechani-cal property report.5. Coating Mass5.1 Coating mass shall conform to the requirements forcoating designation (mass and type) as given in SpecificationA917 and in Table 1 for the specific coating designation. Themass of the coating is the single spot value on each
22、surface ofthe sheet in grams per square metre for G coatings and ouncesper square foot for Z coatings.5.2 Coating Mass Tests:5.2.1 The weigh-strip-weigh method (see Test Method A90/A90M) is a destructive test that determines coating mass bymeasuring the difference in weight between a coated and astr
23、ipped (uncoated) sample. If one surface is protected suitablyduring the initial stripping, coating mass can be determined foreach surface independently. Conversion of the coating mass tocoating thickness is possible only if the density of the coatingis known precisely.5.2.2 Coating thickness measure
24、ments by X-ray fluores-cence (see Test Method A754/A754M) is a nondestructive testthat determines coating mass by converting X-ray fluorescencemeasurements to coating mass values. This method is readilyadaptable to the continuous monitoring of coating mass duringcoating. Thus modern electroplating f
25、acilities are frequentlyequipped with X-ray fluorescence gages that provide feedbackto control the coating mass. These devices may be used as abasis for determining suitability for shipment provided thatthey have been calibrated properly.5.2.3 Measurement by Coulometric Method (see TestMethod B504)
26、is a destructive test that determines lightercoating mass applications.5.3 The referee method to be used shall be as agreed uponbetween the producer and the consumer. In the absence of suchagreement, Test Method A90/A90M shall be used as thereferee method.5.3.1 Estimate the coating thickness from th
27、e coatingweight (mass) by using the following relationships:5.3.1.1 Inch-Pound Units1.00 oz/ft2coatingweight = 1.68 mils coating thickness (0.00168 in.); 1.00 mil(0.001 in.) coating thickness = 0.595 oz ft2coating weight.5.3.1.2 SI Units1.00 g/m2coating mass = 0.140 micro-metre coating thickness; 1.
28、00 micro-metre coating thick-ness = 7.14 g/m2coating mass.6. Keywords6.1 electrolytic zinc coated; steel sheet, zinc coated; zinccoated; zinc coated steel sheetTABLE 1 Coating Weight and Mass per Surface,Afor Steel Sheet, Zinc Coated by the Electrolytic ProcessBInch-Pound Units, oz/ft2SI Units, g/m2
29、Coating DesignationCMinimum Maximum Coating DesignationCMinimum Maximum00Z no coating no coating 00G no coating no coating01ZD0.01 0.05 03GD31502ZE0.02 0.08 06GE6204ZF0.04 0.10 12GF12 3007Z 0.07 0.13 20G 20 4008ZG0.08 0.16 24GG24 4513Z 0.13 0.23 40G 40 7016Z 0.16 0.26 50G 50 8020Z 0.20 0.30 60G 60 9
30、023Z 0.23 0.36 70G 70 11030Z 0.30 0.43 90G 90 13032Z 0.32 0.46 98G 98 140AConversion for coating weight and mass are: 1.00 oz/ft2= 305 g/m2and 1.00 g/m2= 0.00328 oz/ft2.BThe product shall be coated on at least one surface; therefore, the combination 00Z/00Z or 00G/00G shall not be specified.CSee Spe
31、cification A917.DFormally Flash CoatingEFormally Intermediate CoatingFFormally Full CoatingGFormally Double CoatingA879/A879M 12 (2017)2ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this stan
32、dard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years and
33、if not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, w
34、hich you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959
35、,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 12 (2017)3
