ASTM F31-21

Standard Specification for Nickel-Chromium-Iron Sealing Alloys

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STANDARD published on 1.11.2021

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The information about the standard:

Designation standards: ASTM F31-21
Publication date standards: 1.11.2021
SKU: NS-1044337
The number of pages: 4
Approximate weight : 12 g (0.03 lbs)
Country: American technical standard
Category: Technical standards ASTM

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Nickel, chromium and their alloys

Annotation of standard text ASTM F31-21 :

This specification covers iron-nickel-chromium alloy (UNS K94760) used primarily for glass-sealing applications in electronic devices. The chemical composition of the material shall conform to the requirements prescribed. Chemical analysis shall be made, when desired, in accordance with the prescribed requirements. The average linear coefficient of thermal expansion shall be within limits of the requirements specified. The material shall be commercially smooth, uniform in cross section, in composition, and in temper; it shall be free of scale, corrosion, cracks, seams, scratches, slivers, and other defects.

Keywords:
glass-to-metal sealing, iron-nickel-chromium alloy, UNS K94760 , UNS K95150 ,, ICS Number Code 77.120.40 (Nickel, chromium and their alloys)

Additional information

1. Scope

1.1?This specification covers two iron-nickel-chromium alloys (UNS K94760 and UNS K95150) used primarily for glass-sealing applications in electronic devices.

1.2?The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.

1.3?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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.4?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

2. Referenced Documents

E112-13(2021)	Standard Test Methods for Determining Average Grain Size
E228-22	Standard Test Method for Linear Thermal Expansion of Solid Materials With a Push-Rod Dilatometer
E18-22	Standard Test Methods for Rockwell Hardness of Metallic Materials
E29-22	Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E354-21e1	Standard Test Methods for Chemical Analysis of High-Temperature, Electrical, Magnetic, and Other Similar Iron, Nickel, and Cobalt Alloys (Includes all amendments and changes 2/23/2022).
F14-80(2019)	Standard Practice for Making and Testing Reference Glass-Metal Bead-Seal
F140-98(2020)	Standard Practice for Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric Methods
F144-80(2019)	Standard Practice for Making Reference Glass-Metal Sandwich Seal and Testing for Expansion Characteristics by Polarimetric Methods

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