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Spectral analysis is an analytical method that uses a spectroscopic instrument to observe and judge the spectrum of a substance's emission to determine the composition of a substance. The equipment used for spectrum analysis is called a spectroscope, and it is also called a steel mirror. Although this instrument has been introduced abroad for many years, many units have not used it fully. How to better play the role of the spectroscope is not difficult. As long as we are very familiar with the common spectral lines of each analysis element, we can quickly find the analysis line of each element in the spectral field of view of the spectrum, and keep in mind the main components of common steel and colored alloys in normal work. The results can be reported quickly and accurately during analysis. It not only allows it to sort the wrong materials and mixes, but also verify the chemical composition of the steel. For example, molybdenum in steel, the content is small, chemical analysis is difficult