ISO/FDIS 9441

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

General information

Current stage: 50.20 Effective date: May 19, 2026

Originator: ISO

Owner: ISO/TC 17/SC 1

Type: International Standard

Scope

The method is applicable to types of steel with niobium contents between 0,005 % (m/m) and 1,3 % (m/m). Specifies principle, reagents, apparatus, sampling, procedure, expression of results and test report. Annex A includes additional information on the international co-operative tests. Annex B gives a graphical representation of precision data.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 9441:1988

NOW

PROJECT
ISO/FDIS 9441
50.20 Proof sent to secretariat or FDIS ballot initiated: 8 weeks
May 19, 2026

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