ASTM B391-99

    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    SUPERSEDED (see Active link, below)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.

    Note-Committee B-10 has adopted "niobium" as the designation for Element No. 41, formerly named "columbium."

    1.2 The materials covered by this specification are:

    1.2.1 R04200-Type 1 -Reactor grade unalloyed niobium,

    1.2.2 R04210-Type 2- Commercial grade unalloyed niobium,

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

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

    1.3 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.

    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/B0391-99

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