Railway Castings, as critical load-bearing components in railway methods, have their internal microstructure directly figuring out the overall performance and repair daily life. Metallographic Evaluation, by revealing the microstructure properties of elements, gives a immediate basis for the standard evaluation of monitor castings. one.Specialized ways of metallographic Evaluation one... https://500px.com/photo/1117471507/rail-joint-bar-by-okok-okok