This standard specifies the method of direct-ray ultrasonic detection of discontinuous pulse echo in materials and components using electromagnetic acoustic transducers. This standard is applicable to the electromagnetic ultrasonic testing of carbon steel, low alloy steel and non-ferrous metal plates with a plate thickness of 6 mm to 100 mm, austenitic stainless steel, austenitic-ferritic duplex stainless steel, aluminum and aluminum alloy plates, Electromagnetic ultrasonic testing of titanium and iron alloy plates, nickel and nickel alloy plates and other plates can be carried out with reference to this standard. Electromagnetic ultrasonic testing of raw materials such as pipes and forgings can be carried out with reference to this standard.