1、Designation: A 664 06e1Standard Practice forIdentification of Standard Electrical Steel Grades in ASTMSpecifications1This standard is issued under the fixed designation A 664; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r 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.e1NOTEThe values statement (1.3) was corrected editorially in September 2006.1. Scope1.1 This practice covers the procedure
3、for designating(within ASTM specifications) standard grades of flat-rolledelectrical 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
4、 at a stated peakvalue of alternating induction and a stated frequency, such as15 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
5、material also meets allthe requirements of the ASTM specification.1.2 Individual specifications that are in conformity with thispractice are Specifications A 677, A 683, A 726, A 840/A 840M, and A 876.1.3 The values stated in customary (cgs-emu and inch-pound) units are to be regarded as standard. T
6、he values givenin parentheses are mathematical conversions to SI units whichare provided for information 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
7、to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A 340 Terminology of Symbols and Definitions Relating toMagnetic TestingA 677 Specification for Nonoriented Electrical Steel FullyP
8、rocessed TypesA 683 Specification for Nonoriented Electrical Steel, Semi-processed TypesA 726 Specification for Cold-Rolled Magnetic LaminationQuality Steel, Semiprocessed TypesA 840/A 840M Specification for Fully Processed MagneticLamination SteelA 876 Specification for Flat-Rolled, Grain-Oriented,
9、Silicon-Iron, Electrical Steel, Fully Processed TypesA 976 Classification of Insulating Coatings for ElectricalSteels by Composition, Relative Insulating Ability andApplication3. Terminology3.1 The terms and symbols used in this practice are definedin Terminology A 340.4. Procedure4.1 General Requir
10、ements of the Core-Loss-TypeDesignationsThe core-loss-type designations to be used forordering purposes and for identification of the shipped materialin ASTM specifications for electrical steels shall be a six-character identification (for example, 36F145) comprised ofthe following basic elements:4.
11、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 36represents a thickness of 0.36 mm or 0.014 in. Refer toAppendix X1 for the relationship between Electrical SheetGauge Number and th
12、ickness.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 conditions ofsampling and testing are given in the ASTM specificationcovering each class of material. The code letter to be used a
13、nd1This 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 May 1, 2006. Published May 2006. Originallyapproved in 1972. Last previous edition approved in 1999 as A 6
14、64 99.2For 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 Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, P
15、O Box C700, West Conshohocken, PA 19428-2959, United States.the 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 maximum permissible core loss inwatts per pound for the test conditio
16、ns 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 an as-shearedEpstein specimen consisting of one half of the stri
17、ps cutparallel to the rolling direction and the other half cut perpen-dicular to the rolled direction.5. Use of Standard Electrical Steel Grade Designations5.1 The standard grade designation, formulated as describedherein, shall be used together with the appropriate ASTMspecification to designate sp
18、ecifically the desired material. Forinstance, a material designated ASTM Specification A 876Type 35G066, would signify grain-oriented electrical steel,fully processed, in a thickness of 0.35 mm with a maximumcore loss of 0.66 W/lb measured at 15 kG (1.5 T) and 60 Hz onEpstein specimens with all stri
19、ps 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 electrical steel shallbe assigned only by ASTM. They shall apply only when anASTM specification incorporating that grade designation hasbecome effe
20、ctive through the normal standardizing activities ofthe Society. The ASTM grade designations shall be used toidentify electrical steel grades only when the material soidentified complies with the requirements of the ASTM speci-fication of which the grade designation is a part.6. Keywords6.1 core los
21、s; electrical steel; fully processed; grain-orientedelectrical steel; identification; laser scribed; magnetic lamina-tion steel; nonoriented electrical steel; semiprocessedTABLE 1 Code Letters and Sampling and Testing ConditionsCode Letter ASTM Specification Class of Material and Core-Loss Testing C
22、onditionsC A 840/A 840M Magnetic lamination steel, fully processed, with core-loss value determined at15 kG (1.5 T) and 60 Hz on as-sheared Epstein specimens.AD A 726 Magnetic lamination steel, semiprocessed, with core-loss value determined at15 kG (1.5 T) and 60 Hz on Epstein specimensAafter a qual
23、ity developmentanneal at 1450F (790C) with a 1-h soak period.F A 677 Nonoriented electrical steel, fully processed, with core-loss value determined at15 kG (1.5 T) and 60 Hz on as-sheared Epstein specimens.AS A 683 Nonoriented electrical steel, semiprocessed, with core-loss value determined at15 kG
24、1.5 T) and 60 Hz on Epstein specimensAafter a quality developmentanneal at 1550F (845C) with a 1-h soak period, except that the temperatureshall be 1450F (790C) for alloy contents less than 1.3 % silicon plus aluminum.G A 876 Grain-oriented electrical steel, fully processed, with core-loss value de
25、terminedat 15 kG (1.5 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.H A 876 Grain-oriented electrical steel, fully processed, with core-loss value determinedat 17 kG (1.7 T) and 60 Hz on Epstein specimensBstress-r
26、elief annealed usuallyin the range from 1450 to 1550F (790 to 845C) with a 1-h soak period.P A 876 Grain-oriented electrical 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 145
27、0 to 1550F (790 to 845C) with a1-h soak period. Relative peak permeability at 10 Oe (796 A/m) typically exceeds1880.Q A 876 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 sp
28、ecimen. Relative peak permeability at 10 Oe (796 A/m)typically exceeds 1880.ATest specimen with one half of the strips cut 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.A66406e12APP
29、ENDIXES(Nonmandatory Information)X1. ELECTRICAL SHEET GAUGE NUMBERSX1.1 Table X1.1 shows the relationship between ElectricalSheet Gauge Numbers and thickness. This is for informationonly.X2. USE OF INSULATING COATINGS DESIGNATIONX2.1 In the interest of promoting computerized databases,the electrical
30、 steel designation contained in this practice can becombined with the coatings designation listed in ClassificationA 976 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
31、grade of steel. Since Classification A 976 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 s
32、tandard 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
33、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 comments will receive careful consideration at a meeting of theresponsible technical committee
34、 which 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 19428-2
35、959,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).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 0.254A66406e13
