Reference number
ISO/TR 7955:1982
© ISO 2024
Technical Report
ISO/TR 7955:1982
Ferroniobium — Determination of niobium content — Gravimetric method
Edition 1
1982-12
Withdrawn
Withdrawn (Edition 1, 1982)

Abstract

Specifies a photometric method for the determination of the titanium content (annex A), a gravimetric method for the determination of tantalum contents greater than 1 % (m/m) (annex B) and a photometric method for the determination of tantalum contents less than 1 % (m/m) (annex C). The methods are applicable to ferroniobium having niobium contents between 40 and 75 % (m/m), tantalum contents between 0,25 and 8,0 % (m/m) and titanium contents between 0,05 and 5,0 % (m/m). Interference may arise if bismuth or trivalent antimony are present.

General information

  • Status
     : Withdrawn
    Publication date
     : 1982-12
    Stage
    : Withdrawal of International Standard [95.99]
  • Edition
     : 1
    Number of pages
     : 14
  • Technical Committee :
    ISO/TC 132
    ICS :
    77.100 
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