ISO 9441:2026

Current Revision
Steel - Determination of niobium content - 4-(2-Pyridylazo)-resorcinol (PAR) spectrophotometric method

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ISO 9441:2026

Steel - Determination of niobium content - 4-(2-Pyridylazo)-resorcinol (PAR) spectrophotometric method

PUBLISH DATE 2026
ISO 9441:2026

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).

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