This European standard establishes a spectrophotometric method for the determination of phosphorus in steels and cast irons. The method is applicable to phosphorus contents between 0.005% and 1.5% (m/m) as long as the contents of each of the elements: tungsten, niobium, tantalum and zirconium are not greater than 1% (m/m). ) and the titanium content does not exceed 2% (m/m).