Aciers — Détermination de la teneur en niobium — Méthode spectrophotométrique au moyen de 4-(2-Pyridylazo)-résorcinol (PAR)

This document specifies a spectrophotometric method by using 4-(2-pyridylazo)-resorcinol (PAR) for the determination of niobium in steel. The method is applicable to all types of steel with niobium contents between 0,005 % (mass fraction) and 1,3 % (mass fraction).