1、Designation:A90103 (Reapproved 2008) Designation: A901 12Standard Specification forAmorphous Magnetic Core Alloys, Semi-Processed Types1This standard is issued under the fixed designation A901; the number immediately following the designation indicates the year oforiginal adoption or, in the case of
2、 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 covers the general requirements to which flat-cast, amorphous, semi-processe
3、d, iron-base magnetic corealloys must conform.1.2 These alloys are produced by a rapid-quenching, direct-casting process, resulting in metals with noncrystalline (amorphous)structure. The metallic alloys are made to meet specified maximum core-loss values and are intended primarily for commercialpow
4、er frequency (50- and 60-Hz) applications in magnetic devices. Desirable core-loss and permeability characteristics aredeveloped by further heat treatment in a magnetic field by the purchaser.user.2The heat treatment typically consists of heating thematerial to a temperature of 320 to 420C in a dry,
5、 inert atmosphere for 5 to 10 min, although soak times of up to 2 h may be usedfor large transformer cores. A magnetic field may be required during annealing as designated by the producer. Exact optimumannealing conditions depend on the processing of the material and the size and shape of the device
6、.1.3 Some of these alloys are sensitive to mechanical stress. Care must be exercised in minimizing any stresses on the materialin its final application, otherwise, its magnetic properties will be impaired significantly. significantly impaired.1.4 This specification is developed to aid in the purchas
7、e of transformer grade amorphous strip. It provides the chemical,physical, and magnetic parameters and procedures for quality control tests.1.5 The values stated in customary (cgs-emu and inch-pound) units are to be regarded as standard. The values given inparentheses are mathematical conversions to
8、 SI units which are provided for information only and are not considered standard.NOTE 1For more information on procedures associated with this specification, refer to the following: Practices A34/A34M, A664, A700, and B490;Test Methods A370 and A773/A773M.1.6 This standard does not purport to addre
9、ss the safety concerns associated with its use. It is the responsibility of the user ofthis standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations priorto use.2. Referenced Documents2.1 ASTM Standards:3A34/A34M Practice for Sampling an
10、d Procurement Testing of Magnetic MaterialsA340 Terminology of Symbols and Definitions Relating to Magnetic TestingA370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA664 Practice for Identification of Standard Electrical Steel Grades in ASTM SpecificationsA700 Practices for P
11、ackaging, Marking, and Loading Methods for Steel Products for ShipmentA712 Test Method for Electrical Resistivity of Soft Magnetic AlloysA773/A773M Test Method for dc Magnetic Properties of Materials Using Ring and Permeameter Procedures with dc ElectronicHysteresigraphsA900/A900M Test Method for La
12、mination Factor of Amorphous Magnetic StripB490 Practice for Micrometer Bend Test for Ductility of ElectrodepositsC693 Test Method for Density of Glass by Buoyancy1This specification is under the jurisdiction of ASTM Committee A06 on Magnetic Properties and is the direct responsibility of Subcommitt
13、ee A06.02 on MaterialSpecifications.Current edition approved Nov. 1, 2008. Published December 2008. Originally approved in 1990. Last previous edition approved in 2003 as A90103. DOI:10.1520/A0901-03R08.Current edition approved Feb. 15, 2012. Published March 2012. Originally approved in 1990. Last p
14、revious edition approved in 2008 as A90103(2008). DOI:10.1520/A0901-12.2The process of heat treatment in a magnetic field is covered by a patent held by General Electric Co. Interested parties are invited to submit information regarding theidentification of acceptable alternatives to this patented i
15、tem to the Committee on Standards, ASTM International Headquarters. Your comments will receive carefulconsideration at a meeting of the responsible technical committee, which you may attend.3For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service
16、astm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.1This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Be
17、causeit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100
18、 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.D3455 Test Methods for Compatibility of Construction Material with Electrical Insulating Oil of Petroleum Origin3. Terminology3.1 The terms and symbols used in this specification are defined in Terminology A340.4. Dimen
19、sions4.1 WidthTolerances on nominal as-cast strip shall be +0.004, 0.020 in. (+0.1 mm, 0.5 mm) from specified purchase width.Tolerances on nominal as-cast strip width shall be 60.65% of the specified purchase width.4.2 ThicknessThe nominal thickness shall be 0.001 in. (0.025 mm) as measured by a 0.2
20、5-in. (6.35-mm) diameter anvilmicrometer. The nominal thickness may vary 60.0002 in. (60.005 mm), but the maximum thickness variation across the widthshall be within 610 % of the mean thickness, or as agreed upon between the purchaseruser and the producer.5. Material Requirements5.1 Amorphous magnet
21、ic core alloys are composed principally of iron with small amounts of alloying elements such as boronand silicon. Other chemical elements are in residual amounts or can be added to improve fabrication or the physical or magneticproperties. The producer shall provide, on request, a statement of the n
22、ominal chemistry being supplied. The nominal compositionfor one particular alloy, in weight percent, is: iron 92.3, silicon 5.2, and boron 3. 2.5.6. Sampling6.1 A continuously cast strip in one coil without breaks will constitute one test lot. In practice, this may represent quantities upto 2200 lb
23、(1000 kg), depending on the width of the strip.6.2 Test samples normally shall be taken from both ends of the continuous strip of each test lot. Other sample frequencies maybe used as agreed upon by the producer and the purchaser.user.6.3 For small coils, less than 100 lb (45 kg), and for coils cont
24、aining splices, the test lot shall be as agreed upon between theproducer and the purchaser. user.7. Physical and Mechanical Property Requirements7.1 DensityThe density shall be provided by the producer to a precision of 60.05 g/cm3(650 kg/m3) as measured by TestMethod C693.7.2 DuctilityStrip bend du
25、ctility, with free solidification surface facing inward, shall be such that a minimum 1-m length ofribbon may be passed 180 around a 0.125-in. (3-mm) polished steel rod without cracking or fracture.7.3 Thermal ExpansionThe nominal coefficient of thermal expansion shall be reported for the temperatur
26、e range 40 to 400C.7.4 Thermal ConductivityThe nominalaverage value measured across the width shall be reported for temperatures of 25, 100,and 400C. The defined These values of thermal conductivity of the material shall not differ from the reported valuepublishedvalues by more than 620%. 20 %.7.5 V
27、olumeElectrical ResistivityThe nominal volumeelectrical resistivity shall be reported as measured by Test MethodA712.7.6 Lamination FactorThe minimum lamination factor of uncoatedascast material shall be 77%81.5 % as measured inaccordance with Test MethodA900/A900M. The lamination factor for coated
28、material shall be as agreed between the producer andthe purchaser. user.7.7 SurfaceThe strip surface and edges shall have no wrinkles, dimples, cracks, folds, flakes, or other injurious imperfectionsthat would make the material unsuitable for the fabrication of transformer cores.7.8 EdgeThe strip ed
29、ge shall have no slivers with a maximum dimension exceeding 0.0040.12 in. (0.1(3.0 mm).7.9 CamberThe strip edge shall show no excessive lateral curvature (camber). Maximum deviation from a straight line of an8-ft (2.4-m) strip edge shall not exceed 0.1 in. (2.5 mm).7.10PinholesThe strip shall have n
30、o pinholes exceeding 0.08 in. (2.0 mm). Maximum hole frequency, visible against a lightsource, shall not be more than 1 per 3 in.2(19.43104m2). HolesThe strip shall have no holes exceeding 0.2 in. (5 mm).Maximum hole frequency, visible against a light source, shall not be more than five per inch (25
31、 mm) of strip length.8. Magnetic Property Requirements8.1 Test ProcedureThe magnetic quality of each batch of material (as defined in 6.1) shall be determined by obtaining testsamples from both ends of a batch (or lot). These samples shall be annealed in a dry, inert atmosphere with an applied magne
32、ticfield of at least 10 Oe (800 A/m) using the time and temperature sequence recommended by the producer. The samples may beeither in toroidal or flat strip form as agreed upon between the producer and the purchaser. user. See 1.2 for an example of typicalheat treatment conditions.8.2 Amorphous magn
33、etic core alloys are purchased to specified maximum core loss requirements. The purchaseruser shall makeclear to the producer the limiting values of core loss required for the ordered material. For the nominal composition given in 5.1,the guaranteed maximum core loss is shown in Table 1.8.3 Dependin
34、g upon the desired end use, other magnetic properties such as specific exciting power, saturation induction,residual induction, and coercive field strength may need to be specified. The purchaseruser is responsible for specifying the limitsA901 122on magnetic properties. The purchaseruser shall also
35、 state whether and what specific tests are required. The guaranteed magneticproperties for the nominal composition given in 5.1 are shown in Table 1.9. Product Uniformity Verification9.1 Since it is assumed that the process will give “essentially identical properties to all parts of a coil,”coil, an
36、d that test samplesare taken at only both ends of a coil, it remains for the producer to verify the uniformity of this product. At regular time intervals,the producer shall perform appropriate tests at regular (length) intervals to verify the uniformity of magnetic and mechanicalproperties throughou
37、t the length of a coil.9.2 Verification of uniformity test results as obtained in 9.1 shall be made available to the purchaseruser when requested.10. Packaging and Marking10.1 The strip shall be free from rust, fingerprints, and grease. No continuous indicationstreaks of oxide shall be visible along
38、the surface or edges of the strip.10.2 SpoolThe inside diameter of the spool hub shall be 9.016 6 0.1 in. (229(406 6 3 mm). The outside diameter of the stripwound on this spool shall be at least 30 in. (762 mm) and shall not exceed 3542 in. (890(1067 mm).10.3 There shall be no more than three breaks
39、 in the strip per spool.At any break, the strip ends shall be sheared square, butted,and joined with tape which shall extend substantially across the width of the strip, but not beyond the strip edges.10.3.1 The tape shall have the following characteristics: tape thickness no greater than the strip
40、thickness; tape base materialand adhesive capable of withstanding the normal core-annealing cycle without significant detriment to tape and strip; tape tensilestrength and adhesive shear strength sufficient to withstand normal core-processing tension and acceleration; and tape base materialand adhes
41、ive compatible with transformer oil when tested in accordance with Test Methods D3455.10.4 The strip shall be manufacturedproduced and wound on the spool in a manner such that, when the strip is removed fromthe spool, the edge of the strip willshall be perpendicular to the axis of the spool with no
42、tendency to curve to one side.10.5 The strip shall be packed to prevent physical damage during shipment. The packaging techniques used shall permitweather-protected inside storage at the purchasersusers site for a period of six months without degradation of the material.10.6 The amorphous metal will
43、shall be placed on a pallet with the spool axis perpendicular to the pallet allowing handling byfork truck. Unpacking will involve only strap cutting and no nail withdrawal.10.7 MarkingTo provide traceability, each spool shall be marked, in an agreed manner, with reference number allowingidentificat
44、ion of the material cast.11. Testing11.1 Test ReportsThe producer shall furnish certified test reports assuring compliance with the requirements of thisspecification.11.2 RejectionAfter establishment of a mutually acceptable sampling and test procedure, the purchaseruser may, at his option,sample te
45、st incoming material for any characteristic defined by this specification and accept or reject material based upon thesesample tests.12. Keywords12.1 amorphous; coercive field strength; core loss; induction; residual induction; specific exciting powerAPPENDIX(Nonmandatory Information)X1. TYPICAL PHY
46、SICAL PROPERTIESX1.1 Typical physical properties for the composition given in 5.1 are listed inTable X1.1.The data provided are for informationonly and are not requirements in this specification.TABLE 1 Magnetic Property Requirements for the Nominal Composition of Fe92B3Si5TestTemperature,CMinimum D
47、C Induction, Hm= 10 Oe (800 A/m)Maximum DC CoerciveField Strength (Hc)Hm=1Oe (80 A/m)Minimum DC ResidualInduction (Br)Hm=1Oe (80 A/m)Maximum 60 Hz Core Loss(Pc(B:f) 14.0 kG (1.40 T)Maximum 60 Hz SpecificExciting Power (Pz(B:f)14.0 kG (1.40 T)25 15.4 kG (1.54 T) 40 mOe (3.2 A/m) 12.0 kG (1.20 T) 0.11
48、4 W/lb (0.251 W/kg) 0.50 VA/lb (1.1 VA/kg)85 14.7 kG (1.47 T) 100 14.5 kG (1.45 T) A901 123ASTM 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
49、 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 comments will receive careful consideration at a meeting of theresponsible
