Published
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).
WITHDRAWN
ISO 9441:1988
PUBLISHED
ISO 9441:2026
60.60
Standard published
Aug 3, 2026