1、Designation: A664 11Standard Practice forIdentification of Standard Electrical Steel Grades in ASTMSpecifications1This standard is issued under the fixed designation A664; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、 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 practice covers the procedure for designating(within ASTM specifications) standard grades of flat-rolledelectric
3、al steels made to specified maximum values of coreloss. This practice applies to magnetically soft irons and steel(low-carbon steels and alloys of iron with silicon, aluminum,and so forth) where a core loss measurement at a stated peakvalue of alternating induction and a stated frequency, such as15
4、kG (1.5 T) and 60 Hz, is normally used to grade thematerial. This practice also applies when some other propertyis specified (or a different induction or frequency, or both) asthe limiting characteristic, provided the material also meets allthe requirements of the ASTM specification.1.2 Individual s
5、pecifications that are in conformity with thispractice are Specifications A677, A683, A726, and A876.1.3 The values stated in customary (cgs-emu and inch-pound) units are to be regarded as standard. The values givenin parentheses are mathematical conversions to SI units whichare provided for informa
6、tion only and are not consideredstandard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated 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
7、 limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A340 Terminology of Symbols and Definitions Relating toMagnetic TestingA677 Specification for Nonoriented Electrical Steel FullyProcessed TypesA683 Specification for Nonoriented Electrical Steel, Semi-processed TypesA726 Specificat
8、ion for Cold-Rolled Magnetic LaminationQuality Steel, Semiprocessed TypesA876 Specification for Flat-Rolled, Grain-Oriented,Silicon-Iron, Electrical Steel, Fully Processed TypesA976 Classification of Insulating Coatings for ElectricalSteels by Composition, Relative Insulating Ability andApplication3
9、. Terminology3.1 The terms and symbols used in this practice are definedin Terminology A340.4. Procedure4.1 General Requirements of the Core-Loss-TypeDesignationsThe core-loss-type designations to be used forordering purposes and for identification of the shipped materialin ASTM specifications for e
10、lectrical steels shall be a six-character identification (for example, 36F145) comprised ofthe following basic elements:4.1.1 First Two DigitsThe first two digits of the gradedesignation shall represent the nominal decimal thickness ofthe material in millimetres. For instance, the number 36represent
11、s a thickness of 0.36 mm or 0.014 in. Refer toAppendix X1 for the relationship between Electrical SheetGauge Number and thickness.4.1.2 Code LettersA code letter shall designate the gen-eral category of magnetic material and the standard samplingand testing practices that apply. The precise conditio
12、ns ofsampling and testing are given in the ASTM specificationcovering each class of material. The code letter to be used andthe sampling and testing conditions associated with that lettershall be as in Table 1.4.1.3 Last DigitsThe last three digits of the grade desig-nation shall represent the maxim
13、um permissible core loss inwatts per pound for the test conditions indicated by the codeletter. For instance, the 145 designation on a standard ASTMspecification used in conjunction with the Code Letter Frepresents 1.45 W/lb for the maximum value of core lossdetermined at 15 kG (1.5 T) and 60 Hz on
14、an as-shearedEpstein specimen consisting of one half of the strips cut1This practice is under the jurisdiction of ASTM Committee A06 on MagneticProperties and is the direct responsibility of Subcommittee A06.02 on MaterialSpecifications.Current edition approved Oct. 1, 2011. Published October 2011.
15、Originallyapproved in 1972. Last previous edition approved in 2006 as A664061. DOI:10.1520/A0664-11.2For 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 to the standards Do
16、cument Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.parallel to the rolling direction and the other half cut perpen-dicular to the rolled direction.5. Use of Standard Electrical Steel Grade Designat
17、ions5.1 The standard grade designation, formulated as describedherein, shall be used together with the appropriate ASTMspecification to designate specifically the desired material. Forinstance, a material designatedASTM SpecificationA876 Type35G066, would signify grain-oriented electrical steel, ful
18、lyprocessed, in a thickness of 0.35 mm with a maximum coreloss of 0.66 W/lb measured at 15 kG (1.5 T) and 60 Hz onEpstein specimens with all strips cut parallel to the rollingdirection, stress-relief annealed at 1450 to 1550F (790 to845C) with a 1-h soak period.5.2 The ASTM grade designations for el
19、ectrical steel shallbe assigned only by ASTM. They shall apply only when anASTM specification incorporating that grade designation hasbecome effective through the normal standardizing activities ofthe Society. The ASTM grade designations shall be used toidentify electrical steel grades only when the
20、 material soidentified complies with the requirements of the ASTM speci-fication of which the grade designation is a part.6. Keywords6.1 core loss; electrical steel; fully processed; grain-orientedelectrical steel; identification; laser scribed; magnetic lamina-tion steel; nonoriented electrical ste
21、el; semiprocessedAPPENDIXES(Nonmandatory Information)X1. ELECTRICAL SHEET GAUGE NUMBERSX1.1 Table X1.1 shows the relationship between ElectricalSheet Gauge Numbers and thickness. This is for informationonly.TABLE 1 Code Letters and Sampling and Testing ConditionsCode Letter ASTM Specification Class
22、of Material and Core-Loss Testing ConditionsD A726 Magnetic lamination steel, semiprocessed, with core-loss value determined at15 kG (1.5 T) and 60 Hz on Epstein specimensAafter a quality developmentanneal at 1450F (790C) with a 1-h soak period.F A677 Nonoriented electrical steel, fully processed, w
23、ith core-loss value determined at15 kG (1.5 T) and 60 Hz on as-sheared Epstein specimens.AS A683 Nonoriented electrical steel, semiprocessed, with core-loss value determined at15 kG (1.5 T) and 60 Hz on Epstein specimensAafter a quality developmentanneal at 1550F (845C) with a 1-h soak period, excep
24、t that the temperatureshall be 1450F (790C) for alloy contents less than 1.3 % silicon plus aluminum.G A876 Grain-oriented electrical steel, fully processed, with core-loss value determinedat 15 kG (1.5 T) and 60 Hz on Epstein specimensBstress-relief annealed usuallyin the range from 1450 to 1550F (
25、790 to 845C) with a 1-h soak period.H A876 Grain-oriented electrical steel, fully processed, with core-loss value determinedat 17 kG (1.7 T) and 60 Hz on Epstein specimensBstress-relief annealed usuallyin the range from 1450 to 1550F (790 to 845C) with a 1-h soak period.P A876 Grain-oriented electri
26、cal steel, fully processed, high permeability, with core-lossvalue determined at 17 kG (1.7 T) and 60 Hz on Epstein specimens,Bstress-relief annealed usually in the range from 1450 to 1550F (790 to 845C) with a1-h soak period. Relative peak permeability at 10 Oe (796 A/m) typically exceeds1880.Q A87
27、6 Grain-oriented electrical steel, fully processed, high permeability, laser scribed,with core-loss value determined at 17 kG (1.7 T) and 60 Hz on an as-shearedsheet-type test specimen. Relative peak permeability at 10 Oe (796 A/m)typically exceeds 1880.ATest specimen with one half of the strips cut
28、 parallel to the rolling direction and the other half cut perpendicular to the rolling direction.BTest specimen with all strips cut parallel to the rolling direction.A664 112X2. USE OF INSULATING COATINGS DESIGNATIONX2.1 In the interest of promoting computerized databases,the electrical steel design
29、ation contained in this practice can becombined with the coatings designation listed in ClassificationA976 to form an identifying alphanumeric field. The usershould consult with the steel producer to verify that thecombination is correct since not all coatings are applicable toa given grade of steel
30、. Since Classification A976 is not aspecification, it is not appropriate at this time to specifyinsulating coating behavior.ASTM 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 exp
31、ressly 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 revis
32、ed, 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, which you may
33、 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,United Stat
34、es. 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
35、secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE X1.1 Electrical Sheet Gauge NumberElectrical SheetGauge NumberThicknessin. mm16 0.0625 1.5917 0.0560 1.4218 0.0500 1.2719 0.0453 1.1520 0.0375 0.95221 0.0340 0.86422 0.0310 0.78723 0.0280 0.71124 0.0250 0.63525 0.0220 0.55926 0.0185 0.47027 0.0170 0.43228 0.0155 0.39429 0.0140 0.35630 0.0125 0.31831 0.0100 0.254A664 113
