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Contents covered by the  magnetic particle inspection protocol 1. The scope of application of the regulations; 2. Magnetization method (including magnetization specification, preparation of workpiece surface); 3, magnetic powder (including particle size, color, magnetic suspension and fluorescent magnetic suspension preparation) 4, test strips; 5. Technical operation; 6. Quality assessment and inspection records. Magnetic particle  testing range 1. It is suitable for detecting cracks on the surface and near surface of ferromagnetic materials with small size, extremely narrow gaps and visually invisible defects. 2, suitable for testing martensitic stainless steel and precipitation hardening stainless steel materials, not suitable for testing austenitic stainless steel materials. 3. It is suitable for testing raw materials (such as steel billets) and processed semi-finished products, finished parts and in-service and used workpieces. 4, suitable for testing pipe bar sheet m...