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

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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).