ASTM-F256 2010

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F256-05(2010) Standard Specification for Chromium-Iron Sealing Alloys with 18 or 28 Percent Chromium

Published By	Publication Date	Number of Pages
ASTM	2010	7

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Description

ASTM F256-05-Reapproved2010

Historical Standard: Standard Specification for Chromium-Iron Sealing Alloys with 18 or 28 Percent Chromium

ASTM F256

Scope

1.1 This 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.

1.2 The 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.

1.3 The 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.

Keywords

glass-to-metal sealing; iron-chromium alloys; UNS K91800; UNS K92801; Chromium electronic materials/applications; Electronic materials/applications–specifications; Glass electronic seals; Glass-to-metal sealing applications; Iron-chromium alloys; Metal electronic components/devices–specifications; Seals–electronic applications (specifications); UNS K91800 (iron, chromium sealing alloy); UNS K92801 (iron, chromium sealing alloy)

ICS Code

ICS Number Code 2801 ()

DOI: 10.1520/F0256-05R10

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Classification Ordering Information Process Temper and Finish Chemical Composition Chemical Analysis TABLE 1 TABLE 2
3	Thermal Expansion Requirements Mechanical Property Requirements Transformation Requirements Permissible Variations in Dimensions Workmanship, Finish, and Appearance Number of Tests and Retests Specimen Heat Treatment TABLE 3 TABLE 4 TABLE 5 TABLE 6
4	Test Methods Inspection Rejection Rehearing TABLE 7 TABLE 8 TABLE 9
5	Certification TABLE 10 TABLE 11 TABLE 12 TABLE 13
6	Packaging and Package Marking Keywords X1. THERMAL EXPANSION X1.1 TABLE 14 TABLE 15 TABLE X1.1

Additional information

Standard Title	F256-05(2010) Standard Specification for Chromium-Iron Sealing Alloys with 18 or 28 Percent Chromium
Published Code	ASTM
Publication Date	2010
Pages Count	7