ASTM A867-2019 pdf free download

ASTM A867-2019 pdf free download.Standard Specification for Iron-Silicon Relay Steels
1. Scope
1.1 This specification covers wrought iron-silicon (Fe-Si) steels that are generally used in the manufacture of electrome- chanical devices, such as relays and solenoids, requiring higher electrical resistivity, higher permeability, and lower coercivity and residual magnetism than provided by either carbon steels or soft magnetic low-carbon irons. The steels covered in this specification are:1.2 This specification covers steels in the form and condi- tion required for fabrication into parts. The fabricated parts typically require a final heat treatment to obtain the desired magnetic performance. The term mill annealed as used in this specification applies to a heat treatment, typically applied by the producer, intended to improve formability. The mill anneal does not provide the optimum magnetic performance and is not intended to replace the need for the finish annealing of parts. 1.3 This specification covers steels in the form of forging billets, hot-rolled bar and strip, cold-finished bar, wire, and cold-rolled strip in thicknesses up to 6.35 mm (0.250 in.). 1.4 This specification does not cover electrical sheet steels used in transformer and motor laminations. Please refer to Specifications A677, A683, A726, A876, and A1086 for standards pertaining to these material types. 1.5 This specification does not cover powder metallurgy materials capable of being processed into magnetic core components having similar silicon contents. 1.6 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to customary (cgs-emu and inch-pound) units which are provided for information only and are not considered standard.1.6.1 There are selected values presented in two units, both of which are in acceptable SI units. These are differentiated by the word “or,” as in “µΩ-cm, or, Ω-m.” 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.8 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3. Ordering Information
3.1 Orders to this specification shall include as much of the following information as is required to describe the desired steel: 3.1.1 ASTM Specification number and steel type, 3.1.2 Dimensions and tolerances. The tolerances are to be mutually agreed upon between the user 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 user 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 user’s fabrication practice. 3.1.9 Exceptions to this specification or special require- ments.
5. Form and Condition
5.1 As the silicon content increases, cold working becomes more difficult, hence, not all product forms are available in each type of steel. The desired form and condition should be specified and discussed with the producer to assure receiving the appropriate product. Available forms and conditions are: 5.1.1 Forging Billet (all steel types)—Billet surface ground, grit blasted, or acid cleaned. 5.1.2 Hot-Rolled Product (all steel types)—Hot rolled, hot rolled and acid cleaned, and hot-rolled and mechanically cleaned. 5.1.3 Cold-FinishedBars—Mill annealed, centerless ground (all steel types), cold drawn (all grades up to 12.7 mm (0.500 in.) round), cold-processed shapes such as squares, rectangles, hexagons (all types except Type 3), centerless ground, and machine turned.