ASTM A901-12
Standard Specification for Amorphous Magnetic Core Alloys, Semi-Processed Types
- Standard No.
- ASTM A901-12
- Release Date
- 2012
- Published By
- American Society for Testing and Materials (ASTM)
- Status
- Replace By
- ASTM A901-19
- Latest
- ASTM A901-19
- Scope
1.1 This specification covers the general requirements to which flat-cast, amorphous, semi-processed, iron-base magnetic core alloys 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 commercial power frequency (50- and 60-Hz) applications in magnetic devices. Desirable core-loss and permeability characteristics are developed by further heat treatment in a magnetic field by the user. The heat treatment typically consists of heating the material to a temperature of 320 to 420°C in a dry, inert atmosphere for 5 to 10 min, although soak times of up to 2 h may be used for large transformer cores. A magnetic field may be required during annealing as designated by the producer. Exact optimum annealing conditions depend on the processing of the material and the size and shape of the device.
1.3 Some of these alloys are sensitive to mechanical stress. Care must be exercised in minimizing any stresses on the material in its final application, otherwise, its magnetic properties will be significantly impaired.
1.4 This specification is developed to aid in the purchase 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 in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard.
Note 18212;For 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 address the safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM A901-12 Referenced Document
- ASTM A34/A34M Standard Practice for Sampling and Procurement Testing of Magnetic Materials
- ASTM A340 Standard Terminology of Symbols and Definitions Relating to Magnetic Testing
- ASTM A370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products
- ASTM A664 Standard Practice for Identification of Standard Electrical Steel Grades in ASTM Specifications
- ASTM A700 Standard Practices for Packaging, Marking, and Loading Methods for Steel Products for Domestic Shipment
- ASTM A712 Standard Test Method for Electrical Resistivity of Soft Magnetic Alloys
- ASTM A773/A773M Standard Test Method for dc Magnetic Properties of Materials Using Ring and Permeameter Procedures with dc Electronic Hysteresigraphs
- ASTM A900/A900M Standard Test Method for Lamination Factor of Amorphous Magnetic Strip
- ASTM B490 Standard Practice for Micrometer Bend Test for Ductility of Electrodeposits
- ASTM C693 Standard Test Method for Density of Glass by Buoyancy
- ASTM D3455 Standard Test Methods for Compatibility of Construction Material with Electrical Insulating Oil of Petroleum Origin
ASTM A901-12 history
- 2019 ASTM A901-19 Standard Specification for Amorphous Magnetic Core Alloys, Semi-Processed Types
- 2012 ASTM A901-12 Standard Specification for Amorphous Magnetic Core Alloys, Semi-Processed Types
- 2008 ASTM A901-03(2008) Standard Specification for Amorphous Magnetic Core Alloys, Semi-Processed Types
- 2003 ASTM A901-03 Standard Specification for Amorphous Magnetic Core Alloys, Semi-Processed Types
- 1997 ASTM A901-97 Standard Specification for Amorphous Magnetic Core Alloys, Semi-Processed Types
