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  • ASTM
    A838/A838M-97 Standard Specification for Free-Machining Ferritic Stainless Soft Magnetic Alloys for Relay Applications
    Edition: 1997
    $91.10
    Unlimited Users per year

Description of ASTM-A838 1997

ASTM A838/A838M-97

Historical Standard: Standard Specification for Free-Machining Ferritic Stainless Soft Magnetic Alloys for Relay Applications




ASTM A838/A838M

Scope

1.1 This specification covers free-machining ferritic stainless soft magnetic materials produced or supplied expressly for use in magnetic cores and other parts requiring a high permeability stainless steel having low-coercive force and low-residual magnetism.

1.1.1 The specific alloy types have corrosion resistance similar to AISI Type 430F and Type 430F Specification A582.

1.1.2 Two specific type alloys are covered in Table 1.

1.2 This specification covers these alloy types supplied in billet or bar form in shapes such as rounds, squares, hexagons, octagons, or special shapes.

1.3 Certain cold finish round bar products are capable of being supplied to required magnetic characteristics such as low-residual magnetism. Other product forms of these alloy types can not be produced having equivalent low-residual magnetism; hence, final machined parts shall be heat treated as recommended by the producer.

1.4 The following safety hazard caveat pertains only to the test method portions in Annex A1 of this specification. This standard does not purport to address all of the safety problems 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.

1.5 Magnetic properties are expressed in cgs-emu units followed by the SI unit equivalent enclosed in parentheses.


Keywords

coercive field strength; coercivity; ferritic stainless steel; free-machining; relay


ICS Code

ICS Number Code 77.140.40 (Steels with special magnetic properties)


DOI: 10.1520/A0838_A0838M-97

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About ASTM

ASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide.
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