1、Designation: A664 15Standard 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 specificcore loss. This practice applies to magnetically soft irons andsteel (low-carbon steels and alloys of iron with silicon,aluminum, and other alloying elements) where a core lossmeasurement at a stated peak value of alternating induction anda state
4、d frequency, such as 1.5 T (15 kG) and 60 Hz, isnormally used to grade the material. This practice also applieswhen some other property is specified (or a different inductionor frequency, or both) as the limiting characteristic, providedthe material also meets all the requirements of the ASTMspecifi
5、cation.1.2 Individual specifications that are in conformity with thispractice are Specifications A677, A683, A726, A876, andA1086.1.3 The values stated in SI units are to be regarded asstandard. The values given in parentheses are mathematicalconversions to customary (cgs-emu and inch-pound) unitswh
6、ich are 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 to establish appro-priate safety and health practices and determine the
7、applica-bility of regulatory 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-pr
8、ocessed TypesA726 Specification 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 Insul
9、ating Ability andApplicationA1086 Specification for Thin-Gauge Nonoriented ElectricalSteel Fully Processed Types3. 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 design
10、ations to be used forordering purposes and for identification of the shipped materialin ASTM specifications for electrical steels shall follow asix-character protocol (for example, 35H094) comprised of theelements described in 4.2, 4.3, and 4.4:4.2 First Two DigitsThe first two digits of the gradede
11、signation shall represent the nominal thickness of the mate-rial in millimetres to the nearest one hundredth millimetremultiplied by 100. For instance, the number 36 represents athickness of 0.36 mm (0.014 in.).4.2.1 Designation of nominal thickness by Electrical SheetGauge Number does not conform t
12、o the requirements of thispractice or of specifications referred to herein. Refer toAppendix X1 for the relationship between Electrical SheetGauge Number and nominal thickness in millimetres andinches.4.3 Code LettersA code letter shall designate the generalcategory of magnetic material and the stan
13、dard sampling andtesting practices that apply. The precise conditions of samplingand testing are given in the ASTM specification covering each1This practice is under the jurisdiction of ASTM Committee A06 on MagneticProperties and is the direct responsibility of Subcommittee A06.02 on MaterialSpecif
14、ications.Current edition approved April 1, 2015. Published April 2015. Originallyapproved in 1972. Last previous edition approved in 2014 as A66414. DOI:10.1520/A0664-15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annu
15、al 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 States1class of material. The code letter to be used and the samplingand testing con
16、ditions associated with that letter shall be as inTable 1.4.4 Last Three DigitsThe last three digits of the gradedesignation provide a reference to the general specific core lossvalues and testing conditions of the material. These digits arebased on the reference value for maximum permissible specif
17、iccore loss in W/lb corresponding to the standardized acceptancevalue in W/kg. The three digit designation presents thereference value in watt per pound, at the test conditionsindicated by the code letter, to the nearest one-hundredth wattper pound multiplied by 100. Examples of the use of the three
18、digit code with selected Code Letters are presented in 4.4.1.4.4.1 Examples of Three Digit Grade Designations:4.4.1.1 Example 1The 155 designation in anASTM speci-fication used in conjunction with the Code Letter F representsmaterial with a maximum specific core loss value of 3.42 W/kg(1.55 W/lb) de
19、termined at 1.5 T (15 kG) and 60 Hz on anas-sheared Epstein specimen consisting of one half of the stripscut parallel to the rolling direction and the other half cutperpendicular to the rolling direction. The three digit designa-tion 155 is based on the reference value of 1.55 W/lb for themaximum va
20、lue of specific core loss.4.4.1.2 Example 2The 094 designation in anASTM speci-fication used in conjunction with the Code Letter H representsmaterial with a maximum specific core loss value of 2.07 W/kg(0.940 W/lb) determined at 1.7 T (17 kG) and 60 Hz on aparallel grain Epstein specimen annealed af
21、ter shearing. Thethree digit designation 094 is based on the reference value of0.940 W/lb for the maximum value of specific core loss.4.4.1.3 Example 3The 650 designation in anASTM speci-fication used in conjunction with the Code Letter T representsmaterial with a maximum specific core loss value of
22、 14.3 W/kg(6.50 W/lb) determined at 1.0 T (10 kG) and 400 Hz, and 43.0W/kg (19.5 W/lb) determined at 1.0 T (10 kG) and 1000 Hz, onan as-sheared Epstein specimen consisting of one half of thestrips cut parallel to the rolling direction and the other half cutperpendicular to the rolling direction. The
23、 three digit designa-tion 650 is based on the 400 Hz reference value of 6.50 W/lbfor the maximum value of specific core loss.TABLE 1 Code Letters and Sampling and Testing ConditionsCode Letter ASTM Specification Class of Material and Core-Loss Testing ConditionsD A726 Magnetic lamination steel, semi
24、processed, with specific core-loss value deter-mined in W/kg at 1.5 T (15 kG) and 60 Hz on Epstein specimensAafter a qualitydevelopment anneal at 790C (1450F) with a 1-h soak period. The three digitgrade designation is based on the specific core loss reference value in W/lb at1.5 T (15 kG) and 60 Hz
25、.F A677 Nonoriented electrical steel, fully processed, with specific core-loss value deter-mined in W/kg at 1.5 T (15 kG) and 60 Hz on as-sheared Epstein specimens.AThe three digit grade designation is based on the specific core loss referencevalue in W/lb at 1.5 T (15 kG) and 60 Hz.S A683 Nonorient
26、ed electrical steel, semiprocessed, with specific core-loss value deter-mined in W/kg at 1.5 T (15 kG) and 60 Hz on Epstein specimensAafter a qualitydevelopment anneal at 845C (1550F) with a 1-h soak period, except that thetemperature shall be 790C (1450F) for alloy contents less than 1.3 % siliconp
27、lus aluminum. The three digit grade designation is based on the core loss refer-ence value in W/lb at 1.5 T (15 kG) and 60 Hz.T A1086 Thin-gauge nonoriented electrical steel, fully processed, with specific core-lossvalue determined in W/kg at 1.0 T (10 kG) and both 400 Hz and 1000 Hz on as-sheared E
28、pstein specimens.AThe three digit grade designation is based on thespecific core loss reference value in W/lb at 1.0 T (10 kG) and 400 Hz.G A876 Grain-oriented electrical steel, fully processed, with specific core-loss value de-termined in W/kg at 1.5 T (15 kG) and 60 Hz on Epstein specimensBstress-
29、reliefannealed usually in the range from 790 to 845C (1450 to 1550F) with a 1-hsoak period. The three digit grade designation is based on the specific core lossreference value in W/lb at 1.7 T (17 kG) and 60 Hz.H A876 Grain-oriented electrical steel, fully processed, with specific core-loss value de
30、-termined in W/kg at 1.7 T (17 kG) and 60 Hz on Epstein specimensBstress-reliefannealed usually in the range from 790 to 845C (1450 to 1550F) with a 1-hsoak period. The three digit grade designation is based on the specific core lossreference value in W/lb at 1.7 T (17 kG) and 60 Hz.P A876 Grain-ori
31、ented electrical steel, fully processed, high permeability, with specificcore-loss value determined in W/kg at 1.7 T (17 kG) and 60 Hz on Epsteinspecimens,Bstress-relief annealed usually in the range from 790 to 845C (1450to 1550F) with a 1-h soak period. Relative peak permeability at 796 A/m (10Oe)
32、 typically exceeds 1880. The three digit grade designation is based on thespecific core loss reference value in W/lb at 1.7 T (17 kG) and 60 Hz.Q A876 Grain-oriented electrical steel, fully processed, high permeability, laser scribed,with specific core-loss value determined in W/kg at 1.7 T (17 kG)
33、and 60 Hz onan as-sheared sheet-type test specimen. Relative peak permeability at 796 A/m(10 Oe) typically exceeds 1880. The three digit grade designation is based onthe specific core loss reference value in W/lb at 1.7 T (17 kG) and 60 Hz.ATest specimen with one half of the strips cut parallel to t
34、he rolling direction and the other half cut perpendicular to the rolling direction.BTest specimen with all strips cut parallel to the rolling direction.A664 1525. Use of Standard Electrical Steel Grade Designations5.1 The standard grade designation, formulated as describedherein, shall be used toget
35、her with the appropriate ASTMspecification to designate specifically the desired material. Forinstance, a material designatedASTM Specification A876 Type35H094 signifies grain-oriented electrical steel, fullyprocessed, in a thickness of 0.35 mm (0.014 in.) with amaximum specific core loss of 2.07 W/
36、kg (0.940 W/lb)measured at 1.7 T (17 kG) and 60 Hz on Epstein specimenswith all strips cut parallel to the rolling direction, stress-reliefannealed at 790 to 845C (1450 to 1550F ) with a 1-h soakperiod.5.2 The ASTM grade designations for electrical steel shallbe assigned only by ASTM. They shall app
37、ly 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 material soidentified complies with the requirements of the
38、 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 steel; semiprocessed; thin-gauge electrical steelAPPENDIXES(Non
39、mandatory Information)X1. ELECTRICAL SHEET GAUGE NUMBERSX1.1 Table X1.1 shows the relationship between ElectricalSheet Gauge Number and nominal thickness in millimetre andinch. This table is provided for information only.TABLE X1.1 Electrical Sheet Gauge NumberElectrical SheetGauge NumberNominal Thi
40、cknessmm in.16 1.59 0.062517 1.42 0.056018 1.27 0.050019 1.15 0.045320 0.952 0.037521 0.864 0.034022 0.787 0.031023 0.711 0.028024 0.635 0.025025 0.559 0.022026 0.470 0.018527 0.432 0.017028 0.394 0.015529 0.356 0.014030 0.318 0.012531 0.254 0.0100A664 153X2. USE OF INSULATING COATINGS DESIGNATIONX2
41、.1 In the interest of promoting computerized databases,the electrical steel designation 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 thecom
42、bination is correct since not all coatings are applicable toa given grade of steel. 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
43、connection with any 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 res
44、ponsible 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 comments will receive caref
45、ul 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 shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International
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