ASTM B391-09

    Standard Specification for Niobium and Niobium Alloy Ingots

    SUPERSEDED (see Active link, below)


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    1. Scope

    1.1 This specification covers unalloyed and alloyed niobium ingots prepared by vacuum- or plasma-arc melting or electron-beam melting to produce consolidated metal for processing to various mill shapes.

    1.2 The materials covered by this specification are:

    1.2.1 R04200-Type 1Reactor grade unalloyed niobium,

    1.2.2 R04210-Type 2Commercial grade unalloyed niobium,

    1.2.3 R04251-Type 3Reactor grade niobium alloy containing 1 % zirconium, and

    1.2.4 R04261-Type 4Commercial grade niobium alloy containing 1 % zirconium.

    1.3 Unless a single unit is used, for example, force for hardness testing in kN, the 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.

    1.4 The following precautionary caveat pertains only to the test method portions 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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    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 Code

    ICS Number Code 77.150.99 (Other products of non-ferrous metals)

    UNSPSC Code

    UNSPSC Code 30266216(Non ferrous alloy extrusion ingot)


    DOI: 10.1520/B0391-09

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