ASTM-F256 2005

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

Published By	Publication Date	Number of Pages
ASTM	2005	8

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Description

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 300C. The alloy is prone to sigma phase formation and associated brittle mechanical behavior after prolonged exposures at temperatures close to 475C.

1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

The following hazard caveat pertains only to the test method portion, Sections and , 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.

PDF Catalog

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

Additional information

Standard Title	F256-05 Standard Specification for Chromium-Iron Sealing Alloys with 18 or 28 Percent Chromium
Published Code	ASTM
Publication Date	2005
Pages Count	8

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ASTM-F256 2005

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