GB/T 2976-2020 specifies the winding test method for metallic materials in wire form, applicable to metal wires with a diameter or characteristic dimension ranging from 0.1 mm to 10 mm. It can also be used to determine the adhesion performance of coatings on coated metal wires. The standard clearly defines the test principle, equipment, procedures, and result evaluation requirements. The core of the test involves using an adjustable-speed, bidirectional winding test machine, paired with a mandrel of specific hardness and a tension application device, to wind the specimen tightly and without twisting around the mandrel. By controlling parameters such as winding speed, number of turns, and tension, and combining visual inspection or observation under 10x magnification, the test evaluates whether the wire cracks, fractures, or whether the coating peels off. This assesses the wire's plastic deformation capability and coating adhesion performance.