ASTM F 256 : 2005 : R2015
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.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
Hardcopy , PDF
03-12-2023
English
01-07-2015
Important note : Users cannot be edited or removed once added to your Multi user PDF.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.
| Committee |
F 01
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| DevelopmentNote |
Supersedes ASTM F 257. (03/2002)
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| DocumentType |
Standard
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| Pages |
7
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| ProductNote |
Reconfirmed 2015
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| PublisherName |
American Society for Testing and Materials
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| Status |
Superseded
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| SupersededBy | |
| Supersedes |
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.
| 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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