ASTM F 256 Standard Specification for Chromium-Iron Sealing Alloys with 18 or 28 Percent Chromium

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ASTM F 256 Document Information:

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

ASTM International

Publication Date:
Jan 1, 2005

Scope:

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.

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 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

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