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This specification covers hafnium alloyed niobium bar, rod, and wire. The material covered by this specification is R04295, a niobium-base alloy containing hafnium and titanium. The alloy shall conform to the required chemical composition for carbon, oxygen, nitrogen, hydrogen, hafnium, titanium, zirconium, tungsten, tantalum, and niobium. Materials in the annealed condition supplied under this specification shall conform to the required mechanical properties such as tensile strength, yield strength, and elongation. The alloy shall undergo the following test methods: room temperature tension test; elevated temperature tension test; and chemical test.
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.
Significance and Use
12.1 The following applies to all specified limits in this standard for purposes of determining conformance with this specification. The observed value or a calculated value shall be rounded off to the nearest unit in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice .
1.1 This specification covers hafnium alloyed niobium bar and wire.
1.2 The material covered by this specification is R04295, niobium-base alloy containing approximately 10 % hafnium and 1 % titanium.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.4 The following safety hazards caveat pertains only to the test methods portion, Section 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. , of this specification:
1.5 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
B652/B652M Specification for Niobium-Hafnium Alloy Ingots
E8/E8M Test Methods for Tension Testing of Metallic Materials
E21 Test Methods for Elevated Temperature Tension Tests of Metallic Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E2626 Guide for Spectrometric Analysis of Reactive and Refractory Metals
ICS Number Code 77.150.99 (Other products of non-ferrous metals)
UNSPSC Code 30266000(Precious metal and specialty metal bars)
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ASTM B655 / B655M-10(2018), Standard Specification for Niobium-Hafnium Alloy Bar and Wire, ASTM International, West Conshohocken, PA, 2018, www.astm.orgBack to Top