Designation: A 848/A 848M – 96 Standard Specification for Low-Carbon Magnetic Iron 1 This standard is issued under the fixed designation A 848/A 848M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. 1. Scope 1.1 This specification covers the requirements for wrought low-carbon iron having a carbon content of 0.015 % or less with the remainder of the analysis being substantially iron. 1.1.1 Two alloy types are covered: Type 1 is a lowphospho- rous grade and Type 2 contains a phosphorous addition to improve machinability. 1.2 This specification also covers alloys supplied by a producer or converter in the form and condition suitable for fabrication into parts which will be subsequently heat treated to create the desired magnetic characteristics. It covers alloys supplied in the form of forging billets, hot-rolled products and cold-finished bar, wire, and strip. 1.3 This specification does not cover iron powders capable of being processed into magnetic components. 1.4 This specification does not cover flat-rolled, low-carbon electrical steels. 1.5 The values stated in either customary (absolute (or practical) cgs-emu and inch-pound) units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used inde- pendently of the other. Combining values from the two systems may result in nonconformance with this specification. 2. Referenced Documents 2.1 ASTM Standards: A 34 Practice for Procurement, Testing, and Sampling of Magnetic Materials 2 A 341 Test Method for Direct Current Magnetic Properties of Materials Using dc Permeameters and the Ballistic Test Methods 2 A 596 Test Method for Direct Current Magnetic Properties of Materials Using the Ballistic Method and Ring Speci- mens 2 A 773 Test Method for dc Magnetic Properties of Materials Using Ring and Permeameter Procedures with dc Elec- tronic Hysteresigraphs 2 2.2 Other: IEC Publication 404-7 Method of Measurement of the Coercivity of Magnetic Materials in an Open Magnetic Circuit 3. Ordering Information 3.1 Orders to this specification shall include as much of the following information as is required to describe the desired material: 3.1.1 ASTM specification number and alloy type. 3.1.2 Dimensions and Tolerances—The tolerances are to be mutually agreed upon between the consumer and the producer. 3.1.3 Quantity (weight or number of pieces). 3.1.4 Form and condition 3.1.5 Magnetic property requirements if they are otherwise than stated herein. 3.1.6 Certification of chemical analysis or magnetic prop- erty evaluation, or both. 3.1.7 Marking and packaging 3.1.8 End Use—Whenever possible the consumer should specify whether the product will be machined, blanked into flat pieces, blanked and formed, or deep drawn to shape. This information will help the producer provide the most suitable product for the consumer’s fabrication practice. 3.1.9 Exceptions to this specification or special require- ments. 4. Chemical Composition 4.1 Alloys supplied to this specification shall conform to the requirements in Table 1. Three of the elements listed in Table 1, namely vanadium, titanium, and aluminum, are not required but may be added to suppress magnetic aging. If present they must be analyzed and reported. 5. Form and Condition 5.1 These two alloys are capable of being produced in a wide variety of forms and conditions for fabrication into magnetic components. The desired form and condition shall be discussed with the producer to assure receiving the correct product. Available forms and conditions are: 5.1.1 Forging Billet—Hot-worked and surface conditioned by grinding. 5.1.2 Hot-Rolled Product—Hot-rolled; hot-rolled and acid- cleaned; hot-rolled and annealed; hot-rolled, annealed, and acid-cleaned; hot-rolled and mechanically cleaned; mechanical properties as specified. 5.1.3 Cold-Finished Bars—Cold-drawn, centerless ground, mechanical properties as specified; or relay condition. 1 This specification is under the jurisdiction of ASTM Committee A-6 on Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on Materials Specifications. Current edition approved April 10, 1996. Published June 1996. Originally published as A 848 – 85. Last previous edition A 848 – 95. 2 Annual Book of ASTM Standards, Vol 03.04. 1 AMERICAN SOCIETY FOR TESTING AND MATERIALS 100 Barr Harbor Dr., West Conshohocken, PA 19428 Reprinted from the Annual Book of ASTM Standards. Copyright ASTM