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  • ASTM F 256 : 2005 : R2015

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    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Standard Specification for Chromium-Iron Sealing Alloys with 18 or 28 Percent Chromium

    Available format(s):  Hardcopy, PDF

    Superseded date:  03-12-2023

    Language(s):  English

    Published date:  01-07-2015

    Publisher:  American Society for Testing and Materials

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    Abstract - (Show below) - (Hide below)

    CONTAINED IN VOL. 10.04, 2015 Defines two chromium-iron alloys, the former, (UNS K91800), nominally 18% chromium, balance iron, the latter, (UNS K92801), nominally 28% chromium, in strip, bar, wire, and rod forms intended primarily for sealing to glass in electronic applications.

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    1.1This specification covers two chromium-iron alloys, the former, (UNS K91800), nominally 18 % chromium, balance iron, the latter, (UNS K92801), nominally 28 % chromium, in strip, bar, wire, and rod forms intended primarily for sealing to glass in electronic applications.

    Note 1:UNS K92801 should only be considered for use at service temperatures below 300°C. The alloy is prone to sigma phase formation at temperatures close to 620°C, and exhibits brittle mechanical behavior after prolonged exposures at temperatures close to 475°C.

    1.2The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    1.3The following hazard caveat pertains only to the test method portion, Sections 16 and 17, of this specification. 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

    General Product Information - (Show below) - (Hide below)

    Committee F 01
    Development Note Supersedes ASTM F 257. (03/2002)
    Document Type Standard
    Product Note Reconfirmed 2015
    Publisher American Society for Testing and Materials
    Status Superseded
    Superseded By
    Supersedes

    Standards Referencing This Book - (Show below) - (Hide below)

    ASTM E 228 : 2017 : REDLINE Standard Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer
    ASTM F 140 : 1998 Standard Practice for Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric Methods
    ASTM E 38 : 1985 Methods for Chemical Analysis of Nickel-Chromium and Nickel-Chromium-Iron Alloys (Withdrawn 1989)
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