Standard Specification for
Niobium and Niobium Alloy Ingots1
This standard is issued under the fixed designation B 391; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
click below to Astm B 391 – 03 pdf free download
click below to Astm B 390 – 92 (Reapproved 2000) pdf free download
