ASTM A917-2006a Standard Specification for Steel Sheet Coated by the Electrolytic Process for Applications Requiring Designation of the Coating Mass on Each Surface (General Requir.pdf

1、Designation: A 917 06aStandard 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 A 917; the number immediately following the designation

2、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 (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers hot-rolled

3、 and cold-rolled steelsheet coated by the electrolytic process. Coatings can becomprised of pure metals or metal alloys. For specific coatings,refer to Specifications A 879/A 879M and A 918.1.2 The product shall be coated on one or both surfaces withequal or differential coating masses on the two su

4、rfaces.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 heavier co

5、ating 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 or cold-rol

6、led 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-Hardened Steel (

7、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:2A 90/A 90M Test Method for Weight Mass of Coating onIron and Steel Articles with Zinc or Zinc-Alloy CoatingsA 370 Test Methods and Definitions for Mechan

8、ical Testingof Steel ProductsA 754/A 754M Test Method for Coating Weight (Mass) ofMetallic Coatings on Steel by X-Ray FluorescenceA 879/A 879M Specification for Steel Sheet, Zinc Coatedby the Electrolytic Process for Applications RequiringDesignation of the Coating Mass on Each SurfaceA 902 Terminol

9、ogy Relating to Metallic Coated Steel Prod-uctsA 918 Specification for Steel Sheet, Zinc-Nickel AlloyCoated by the Electrolytic Process for Applications Re-quiring Designation of the Coating Mass on Each SurfaceA 1008/A 1008M Specification for Steel, Sheet, Cold-Rolled, Carbon, Structural, High-Stre

10、ngth Low-Alloy,High-Strength Low-Alloy with Improved Formability, So-lution Hardened, and Bake HardenableA 1011/A 1011M Specification for Steel, Sheet and Strip,Hot-Rolled, Carbon, Structural, High-Strength Low-Alloy,High-Strength Low-Alloy with Improved Formability, andUltra-High StrengthB 504 Test

11、 Method for Measurement of Thickness of Me-tallic Coatings by the Coulometric Method1This 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 Specifications.Current edition approved No

12、v. 1, 2006. Published December 2006. Originallyapproved in 1993. Last previous edition approved in 2006 as A 917 - 06.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer t

13、o 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 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.3. Terminology3.1 DefinitionsFor definitions of terms and abbr

14、eviationsused in this specification, see Terminology A 902.4. Ordering Information4.1 Ordering information for all products is shown in theindividual product specifications.5. Coating Designation (Mass and Type)5.1 The following seven-character format shall be used toidentify the coating mass requir

15、ed:5.1.1 First and Second CharactersMinimum coatingmass of the surface with the less critical surface qualityrequirements;5.1.2 Third CharacterA letter, as designated in the appro-priate product specification, to denote the kind of coating; Gfor pure zinc and N for zinc-nickel alloy;5.1.3 Fourth and

16、 Fifth CharactersMinimum coatingmass of the surface with the more critical surface qualityrequirements;5.1.4 Sixth CharacterA 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

17、U, designating anexposed or unexposed application, 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 imperf

18、ections that affect the cosmeticcharacteristics of 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

19、the requirements of theappropriate specification listed as follows for the steel ordered.Where reference is made to a combined standard (such asSpecification A 1011/A 1011M), conformance shall be to themetric portion, using SI units of measurement as standard.7.1.1 Hot Rolled:7.1.1.1 Commercial Stee

20、l (CS), Drawing Steel (DS), Struc-tural Steel (SS), High-Strength Low-Alloy Steel (HSLAS), andHigh-Strength Low-Alloy Steel with Improved Formability(HSLAS-F)Specification A 1011/A 1011M.7.1.2 Cold Rolled:7.1.2.1 Commercial Steel (CS), Drawing Steel (DS), DeepDrawing Steel (DDS), Extra-Deep Drawing

21、Steel (EDDS),Structural Steel (SS), High-Strength Low-Alloy Steel (HSLAS),High-Strength Low-Alloy Steel with Improved Formability(HSLAS-F), Solution-Hardened Steel (SHS), and Bake-Hardenable Steel (BHS)Specification A 1008/A 1008M.7.2 Base Metal Specimens:7.2.1 Test specimens shall be prepared from

22、finished mate-rial and tested in accordance with Test Methods and DefinitionsA 370.7.2.2 In determining the base metal mechanical properties,base metal thickness shall be measured after stripping thecoating from the ends of the specimen contacting the grips ofthe tension testing machine before testi

23、ng.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 shall be permitted.7.3 Retests for Base Metal Mechanical Properties

24、If 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 requirements pre-scribed in the individual coating specification.8.1.2 The

25、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 A 90/A 90MThe weigh-strip-weighmethod is a destructive test that determines coating mass bymeasuring the difference in weight between a coated and ast

26、ripped (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 coatingis known precisely.8.2.2 Test Method A 754/A 754MMeasu

27、rement 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 the electroplat-ing process. Thus, modern electroplating fa

28、cilities 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.8.2.3 Test Method B 504Measurement of the coating massby the cou

29、lometric 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 uponbetween the producer and the consumer. In the absence o

30、f suchagreement, Test Method A 90/A 90M, 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 the specimen is closerthan 25 mm to the edge of the as-recei

31、ved 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. IfA 917 06a2either of these values is not met, the material represented shallbe subject to retest in accordance with th

32、e 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 noportion of either sample is closer than 25 mm from th

33、eas-received edges.8.4.2 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 designations other than structural steel,high-strength low-alloy stee

34、l 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 steel sheet in Grades 25,30, 33 Types 1 and 2, and 40 Types 1 and

35、 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 1 and 2, 40, 45, 50, and 55 shall becapable of being bent throug

36、h 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 applicable to cold-rolled structural steelGrade 80.9.3 Coated co

37、ld-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 only. The coating bend test inside diameter shall havea relatio

38、nship 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 specimen shall be cut not less than 50 mm from theedge of the test

39、 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:9.7.1 If the specimen fails the coating bend test, two retestss

40、hall 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 be furnished with certification that samplesrepresenting each lot

41、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 purchase order number, theASTM designation number, andthe heat or lot

42、 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); zinc-coated iron/steel ar-ticles; zinc coatingsTABLE 1 Coating Ben

43、d 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 8

44、0 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-Alloy Steel with Improved FormabilityRatio of the Bend Test Diameter to the thickness of the SpecimenAHigh-Str

45、ength Low-Alloy Steel Sheet, Grade, Classes 1 and 245 50 55 60 65 70112 22212 212 3High-Strength Low-Alloy Steel with Improved Formability Sheet, Grade50 60 70 802212 33ARatios are applicable for all coating designations.A 917 06a3SUMMARY OF CHANGESCommittee A05 has identified the location of select

46、ed changes to this standard since the last issue, A 917 - 06,that may impact the use of this standard. (November 1, 2006)(1) Revised 1.3, 2.1, 7.1.2.1, and 9.2 to include Solution-Hardened Steel (SHS) and Bake-Hardenable Steel (BHS)designations.Committee A05 has identified the location of selected c

47、hanges to this standard since the last issue, A 917 - 05,that may impact the use of this standard. (July 1, 2006)(1) Deleted reference to Specification A 591/A 591M since itwas withdrawn.Committee A05 has identified the location of selected changes to this standard since the last issue, A 917 - 00,t

48、hat may impact the use of this standard. (April 1, 2005)(1) Revised to reflect the latest ASTM standards for ColdRolled and Hot Rolled products. This revision affects 2.1,7.1.1, and 7.1.2.ASTM International takes no position respecting the validity of any patent rights asserted in connection with an

49、y item mentionedin this standard. Users of this standard 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 andif 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 com