ASTM F31

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.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

1. Scope

1.1 This specification covers an iron-nickel-chromium alloy (UNS K94760) used primarily for glass-sealing applications in electronic devices.

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 safety hazards caveat applies only to Section 13. 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.

2. Referenced Documents

ASTM Standards
E112 Test Methods for Determining the Average Grain Size
E18 Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
E228 Test Method for Linear Thermal Expansion of Solid Materials with a Vitreous Silica Dilatometer
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E38 Methods for Chemical Analysis of Nickel-Chromium and Nickel-Chromium-Iron Alloys
F14 Practice for Making and Testing Reference Glass-Metal Bead-Seal
F140 Practice for Making Reference Glass-Metal Butt Seals and Testing for Expansion Characteristics by Polarimetric Methods
F144 Practice for Making Reference Glass-Metal Sandwich Seal and Testing for Expansion Characteristics by Polarimetric Methods

Index Terms

glass-to-metal sealing; iron-nickel-chromium alloy; UNS K; ICS Number Code 4760; 77.120.40 (Nickel, chromium and their alloys)

Citing ASTM Standards

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