This standard describes a method for the photometric determination of a titanium content up to 6% (m/m) and is applicable to the chemical examination of iron, non-alloyed, alloyed and high-alloyed steel. The detection limit is approximately 0.001% (m/m) titanium. The determination is not affected by the levels of chromium, manganese, nickel, tantalum and vanadium normally found in iron and steel. N'obium interferes with the determination if the content exceeds the content normally found in steel [up to approximately 1% (m/m)]. Copper and tungsten produce a negative error, while molybdenum produces a positive error. Table 1 — Maximum permis ible content of copper, molybdenum or tungsten in the sample for a relative error < 1 % in the titanium content to be determined % (m/m) Ti % (m/m) Cu % (m/m) Mo % (m/m)\N < 0.025 0.025 - 0.25 0.25 -2.5 >2.5 1 unlimited unlimited unlimited 1 2.5 unlimited unlimited 3 4 10 20
NEN 6222-1981 history
1981NEN 6222-1981 Chemical analysis of iron and steel Photometric determination of the titanium content in iron and steel