Abstract：The separation and determination of titanium phases in titanium-containing micro-alloyed steel were required. A quantitative method for the rapid separation of titanium precipitation phases in micro-alloyed steel was established. By means of optimization tests, the traditional methanol electrolyte for the extraction of titanium precipitation phases in micro-alloyed steel was replaced by 75g/L potassium chloride solution-5g/L citric acid-deionized water in experiments. The electrolysis at 0℃ solved the problem of slow electrolysis rate at low temperature. The fine-grained titanium carbide was decomposed with 2.4mol/L HCl, the coarse-grained titanium carbide was decomposed with 1mol/L HNO3, and titanium nitride was decomposed with HNO3 and H2O2. The content of titanium in each phase was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The content of solid solution titanium was obtained by subtraction method. The content of sulfur in residue was determined by carbon-sulfur analyzer and then converted to calculate the content of titanium sulfide. The proportion of fine-grained titanium carbide, coarse-grained titanium carbide, titanium nitride, titanium sulfide and solid solution titanium in titanium precipitation phases was 34.27%, 22.38%, 14.68%, 6.29% and 16.78%, respectively. The recovery of titanium precipitation phases in proposed method was 94.41%.
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