ASTM A917-2008(2015) Standard Specification for Steel Sheet Coated by the Electrolytic Process for Applications Requiring Designation of the Coating Mass on Each Surface (General R.pdf

1、Designation: A917 08 (Reapproved 2015)Standard Specification forSteel Sheet, Coated by the Electrolytic Process forApplications Requiring Designation of the Coating Mass onEach Surface (General Requirements)1This standard is issued under the fixed designation A917; the number immediately following t

2、he designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification cove

3、rs hot-rolled and cold-rolled steelsheet coated by the electrolytic process. Coatings can becomprised of pure metals or metal alloys. For specific coatings,refer to Specifications A879/A879M and A918.1.2 The product shall be coated on one or both surfaces withequal or differential coating masses on

4、the two surfaces.Sheet-coated with equal coating masses on each surface hassimilar levels of corrosion protection on each surface. Often,however, a higher level of corrosion protection is required onone surface than is required on the other. In these situations,one surface shall be specified with a

5、heavier coating mass thanthe other. Either surface, when specified to be painted, willprovide additional corrosion protection as compared to anunpainted surface.1.3 This coating process has essentially no effect on the basemetal mechanical properties, and use is permitted on any gradeof hot-rolled o

6、r cold-rolled steel sheet. The coated sheet isavailable as Commercial Steel (CS), Drawing Steel (DS), DeepDrawing Steel (DDS), Extra-Deep Drawing Steel (EDDS),Structural Steel (SS) High-Strength Low-Alloy Steel(HSLAS), High-Strength Low-Alloy Steel with ImprovedFormability (HSLAS-F), Solution-Harden

7、ed Steel (SHS), orBake-Hardenable Steel (BHS).1.4 The values stated in SI units are to be regarded as thestandard.2. Referenced Documents2.1 ASTM Standards:2A90/A90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA370 Test Methods and Definitions for

8、 Mechanical Testingof Steel ProductsA754/A754M Test Method for Coating Weight (Mass) ofMetallic Coatings on Steel by X-Ray FluorescenceA879/A879M Specification for Steel Sheet, Zinc Coated bythe Electrolytic Process for Applications Requiring Des-ignation of the Coating Mass on Each SurfaceA902 Term

9、inology Relating to Metallic Coated Steel Prod-uctsA918 Specification for Steel Sheet, Zinc-Nickel AlloyCoated by the Electrolytic Process for Applications Re-quiring Designation of the Coating Mass on Each SurfaceA1008/A1008M Specification for Steel, Sheet, Cold-Rolled,Carbon, Structural, High-Stre

10、ngth Low-Alloy, High-Strength Low-Alloy 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 Me

11、thod for Measurement of Thickness of Metal-lic Coatings by the Coulometric Method3. Terminology3.1 Definitions For definitions of terms and abbreviationsused in this specification, see Terminology A902.4. Ordering Information4.1 Ordering information for all products is shown in theindividual product

12、 specifications.5. Coating Designation (Mass and Type)5.1 The following seven-character format shall be used toidentify the coating mass required:5.1.1 First and Second Characters Minimum coatingmass of the surface with the less critical surface qualityrequirements;5.1.2 Third Character A letter, as

13、 designated in theappropriate product specification, to denote the kind of coating;G for pure zinc and N for zinc-nickel alloy;1This specification is under the jurisdiction of ASTM Committee A05 onMetallic-Coated Iron and Steel Products and is the direct responsibility ofSubcommittee A05.11 on Sheet

14、 Specifications.Current edition approved May 1, 2015. Published May 2015. Originallyapproved in 1993. Last previous edition approved in 2008 as A917 - 08. DOI:10.1520/A0917-08R15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org.

15、 For 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 States15.1.3 Fourth and Fifth Characters Minimum coatingmass of the surface

16、 with the more critical surface qualityrequirements;5.1.4 Sixth Character A letter, as designated in the appro-priate product specification, to denote the kind of coating; Gfor pure zinc and N for zinc-nickel alloy;5.1.5 Seventh CharacterEither E or U, designating anexposed or unexposed application,

17、 respectively.Example: 60 G 20 G ESee Section: 5.1.1 5.1.2 5.1.3 5.1.4 5.1.5NOTE 1The terms “exposed” and “unexposed” describe the intendedapplication as either hidden or exposed to view and is an indicator of thedegree of freedom from surface imperfections that affect the cosmeticcharacteristics of

18、 the coated surface.6. Chemical Requirements6.1 The heat analysis of the steel shall conform to therequirements of the specification for the steel ordered or asspecified by negotiations.7. Base Metal Requirements7.1 The steel shall conform to all of the requirements of theappropriate specification l

19、isted as follows for the steel ordered.Where reference is made to a combined standard (such asSpecification A1011/A1011M), conformance shall be to themetric portion, using SI units of measurement as standard.7.1.1 Hot Rolled:7.1.1.1 Commercial Steel (CS), Drawing Steel (DS), Struc-tural Steel (SS),

20、High-Strength Low-Alloy Steel (HSLAS), andHigh-Strength Low-Alloy Steel with Improved Formability(HSLAS-F)Specification A1011/A1011M.7.1.2 Cold Rolled:7.1.2.1 Commercial Steel (CS), Drawing Steel (DS), DeepDrawing Steel (DDS), Extra-Deep Drawing Steel (EDDS),Structural Steel (SS), High-Strength Low-

21、Alloy Steel (HSLAS),High-Strength Low-Alloy Steel with Improved Formability(HSLAS-F), Solution-Hardened Steel (SHS), and Bake-Hardenable Steel (BHS)Specification A1008/A1008M.7.2 Base Metal Specimens:7.2.1 Test specimens shall be prepared from finished mate-rial and tested in accordance with Test Me

22、thods and DefinitionsA370.7.2.2 In determining the base metal mechanical properties,one of the following methods shall be used. Unless specified inthe order, the producer shall determine the method to be used;however, in the event of a dispute the method in 7.2.2.1 shallbe used.7.2.2.1 The base meta

23、l thickness shall be measured afterstripping the coating from the ends of the specimen contactingthe grips of the tension testing machine before testing.7.2.2.2 The base metal thickness shall be determined bysubtracting the coating thickness from the measured thicknessof the tension test specimen. T

24、he coating thickness shall becalculated from the coating mass test.7.2.3 When the percent elongation in the tension test is lessthan the specified minimum and any part of the fracture isoutside the middle half of the gage length as scribed before thetest, the test shall be discarded and a retest sha

25、ll be permitted.7.3 Retests for Base Metal Mechanical PropertiesIf onetest fails for base metal mechanical requirements, retestingshall conform to the provisions of the applicable base metalspecification.8. Coating Mass Requirements8.1 Coating Mass:8.1.1 Coating mass shall conform to the requirement

26、s pre-scribed in the individual coating specification.8.1.2 The mass of the coating is the single spot value oneach surface of the sheet expressed in grams per square metre.8.2 Coating Mass Tests:8.2.1 Test Method A90/A90MThe weigh-strip-weighmethod is a destructive test that determines coating mass

27、 bymeasuring the difference in weight between a coated and astripped (uncoated) sample. If one surface is protected suitablyduring the initial stripping, coating mass can be determined foreach surface independently. Conversion of the coating tocoating thickness is only possible if the density of the

28、 coatingis known precisely.8.2.2 Test Method A754/A754MMeasurement by X-rayfluorescence is a nondestructive test that determines coatingmass by converting X-ray fluorescence measurements to coat-ing mass values. This test method is readily adaptable to thecontinuous monitoring of coating mass during

29、 the electroplat-ing process. Thus, modern electroplating facilities are fre-quently equipped with X-ray fluorescence gages that providefeedback to control the coating mass. These devices are used asa basis for determining suitability for shipment provided thatthey have been calibrated properly.8.2.

30、3 Test Method B504Measurement of the coating massby the coulometric method is a destructive test that determinescoating mass or thickness, or both, electrochemically. This testmethod is rapid and versatile for lighter coating mass applica-tions.8.2.4 The referee method to be used shall be as agreed

31、uponbetween the producer and the consumer. In the absence of suchagreement, Test Method A90/A90M, the weigh-strip-weighmethod, shall be used as the referee method.8.3 Sampling for Coated Mass Test :8.3.1 One test specimen shall be taken from the lift of cutlengths or coils such that no portion of th

32、e specimen is closerthan 25 mm to the edge of the as-received sheet.8.3.2 The coating mass of this specimen shall conform toboth the minimum and maximum values shown in the appli-cable coating specification for the coating mass specified. Ifeither of these values is not met, the material represented

33、 shallbe subject to retest in accordance with the procedures given in9.4.8.4 Retest for Coating Mass Values :8.4.1 When it is desired to retest to determine compliance tothe coating mass values, two test specimens shall be selected atrandom from the same lift of cut lengths or coil, such that noport

34、ion of either sample is closer than 25 mm from theas-received edges.A917 08 (2015)28.4.2 When tested, each of the two retest specimens shallconform to both the minimum and maximum values shown inthe specification for the coating mass specified.9. Coating Bend Test Requirements9.1 For all steel desig

35、nations other than structural steel,high-strength low-alloy steel and high-strength low-alloy steelwith improved formability, the coated sheet shall be capable ofbeing bent flat through 180 in any direction without flaking ofthe coating on the outside of bend only.9.2 Coated cold-rolled structural s

36、teel sheet in Grades 25,30, 33 Types 1 and 2, and 40 Types 1 and 2, coated cold-rolledsolution-hardened steel sheet in Grades 26, 31, 35, 41, and 44,coated cold-rolled bake-hardenable steel sheet in Grades 26,31, 35, 41, and 44, and coated hot-rolled structural steel sheetin Grades 30, 33, 36 Types

37、1 and 2, 40, 45, 50, and 55 shall becapable of being bent through 180 in any direction withoutflaking of the coating on the outside of the bend only. Thecoating bend test inside diameter shall have a relationship tothe thickness of the specimen as prescribed in Table 1. There isno coating bend test

38、applicable to cold-rolled structural steelGrade 80.9.3 Coated cold-rolled and hot-rolled high-strength low-alloy steel, and high-strength low-alloy steel with improvedformability sheet shall be capable of being bent through 180in nay direction without flaking of the coating on the outside ofthe bend

39、 only. The coating bend test inside diameter shall havea relationship to the thickness of the specimen as prescribed inTable 2.9.4 Flaking of the coating within 6 mm of the edge of thebend specimen shall not be cause for rejection.9.5 Coating bend test specimens shall be cut 50 to 100 mmwide. The sp

40、ecimen shall be cut not less than 50 mm from theedge of the test sheet.9.6 Electrolytic coatings are usually tightly adherent, evenwhen used for difficult forming operations. However, powder-ing is possible if the material is severely formed or coinedduring forming.9.7 Retests for Coating Bend Tests

41、 :9.7.1 If the specimen fails the coating bend test, two retestsshall be taken on random samples from the same lot of anyspecific item.9.7.2 Both retests must conform to the requirements of thisspecification.10. Certification10.1 When specified in the purchase order or contract, thepurchaser shall b

42、e furnished with certification that samplesrepresenting each lot have been either tested or inspected asdirected in this specification and the requirements have beenmet. When specified in the purchase order or contract, a reportof the test results shall be furnished. The report shall includethe purc

43、hase order number, theASTM designation number, andthe heat or lot number correlating the test results with thematerial represented.11. Keywords11.1 coatings, metallic; coatings, zinc; electrodepositedcoatings; steel products; steel sheet; steel sheet-zinc coated;zinc coated (electrolytic process); z

44、inc-coated iron/steel ar-ticles; zinc coatingsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, a

45、nd 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 andif not revised, either reapproved or withdrawn. Your comments are invited either for revis

46、ion 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, which you may attend. If you feel that your comments have not received a fair hearing you s

47、houldmake 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,United States. Individual reprints (single or multiple copies) of this standard may be ob

48、tained 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 01

49、923, Tel: (978) 646-2600; http:/ 1 Coating Bend Test for Structural SteelRatio of the Bend Diameter to the Thickness of the SpecimenACold-Rolled Sheet, GradeB25 30 33 Types 1 and 2 40 Types 1 and 2112 2212 3Hot-Rolled Sheet, Grade30 33 36 Types 1 and 2 40 45 50 551112 112 2212 33AThese ratios are applicable for all coating designations.BGrade 80 is not subject to any bend test requirement; therefore, there is nocoating bend requirement for this grade.TABLE 2 Coating Bend Test for High-Strength Low-Alloy Steeland High-Strength Low-Al