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ISO 9441:2026

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

Publication date:   Aug 3, 2026

General information

60.60   Standard published   Aug 3, 2026

ISO

ISO/TC 17/SC 1 Methods of determination of chemical composition

International Standard

77.080.20   Steels

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Scope

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).

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 9441:1988

NOW

PUBLISHED
ISO 9441:2026
60.60 Standard published
Aug 3, 2026