PMI test of steel pipe
PMI test of steel pipe
The full name of PMI is Positive Material Identification, which refers to material analysis, or material identification, material chemical composition test.
PMI test of steel pipe mainly completes the content measurement and grade determination of each element in various alloy steel pipes. Judge whether the material of the steel pipe is up to standard. PMI testing is an important part of production. It ensures the safety of materials used in production.
There are three traditional methods of PMI test:
1. Volumetric analysis: the standard solution (known concentration of the solution) reacts completely with the measured elements in the steel pipe, and then according to the volume of the standard solution consumed to calculate the content of the measured elements.
2. Spectral analysis method: all kinds of elements can produce their own unique spectrum under the excitation of high temperature and high energy. According to the characteristic spectrum produced by the element after excitation, the chemical composition and the approximate content of the steel pipe can be determined. This method is called spectral analysis method. The characteristic spectra of the tested elements are usually excited by external energy such as arc, electric spark and laser. After spectroscopic analysis, the results were compared with those of chemical elements.
3. Spark identification method: mainly used for steel, grinding in the grinding wheel, due to friction, high temperature, various elements, particle oxidation spark number, shape, bifurcation, color and other differences, to identify the material chemical composition (constituent elements) and roughly the content of a method.
Operation
The handheld alloy analyzer, which is widely used by people, is non-destructive, fast, quantitative, light and portable. Laboratory results can be obtained in a few seconds from the screen of a hand-held alloy analyzer, which plays an important role in field analysis. In many areas, hand-held alloy analyzer ensures 100% field material testing (PMI), is a very intuitive and convenient testing process, very popular with users.
Advantage
Hand-held alloy analyzer can quickly obtain alloy grade and chemical composition within 2-5 seconds without any shape and size restrictions on the part under test. Plates, fittings, flanges, welds, valves, wire meshes, etc. can be measured without restrictions, barrier-free, very low surface requirements, while the hand-held alloy analyzer system provides a strong user-friendly custom number and modification methods, users can freely adjust according to the use of habits and requirements.
