Abstract：The handheld X-ray fluorescence spectrometer can be used for the designation identification of materials in many fields such as metal processing, use and recovery, and it has become the effective approach for on-site material management. However, when the alloying components in material such as Mn, Ti and V is less than 0.5%, the designation information obtained will be not accurate, which brings great hardship to the field inspectors. In order to control the on-site identification error, the identification conditions by handheld X-ray fluorescence spectrometer were optimized: the voltage was 25kV; the testing time was 25s; the sample testing area was 20mm×20mm; the surface roughness was Ra6.3; there was no strong magnetic interference within 5m in experiments. Six groups of alloy samples containing Cr, Ni, Mo, Mn, Ti and V were tested and recorded. It was found that the testing results of Mn, Ti and V had great deviation with standard authorized value, while the testing results of Cr, Ni and Mo were stable within standard range. Therefore, Cr, Ni and Mo were selected as the indicator elements and basis for designation identification to check whether the designation was correct or not. Two segments of alloy steel tube with unknown designation were identified with handheld X-ray fluorescence spectrometer. The measurements results of Cr, Ni and Mo were compared to those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES). The on-site testing results of these three elements were consistent with ICP-AES method, which could fully meet the requirements of designation identification for alloys.
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