Technical requirements for pick remanufacturing 1. Appearance The appearance of the pick after remanufacturing should be smooth and smooth, without visible cracks, folds, dents and other defects. 2. Coating Hardness The Rockwell hardness of the coating for remanufactured picks should not be less than HRC50, and the Vickers hardness should not be less than HV520. 3. Coating wear resistance: The wear rate of the remanufactured coating of the pick after being tested by a high-speed friction testing machine should not be greater than 1×1O-5mm3/(N·m). 4. Coating quality: The remanufactured coating of the cutting pick has no defects such as holes or cracks after color penetrant testing. 5 Coating bonding performance The bonding strength of the pick base material should not be less than 100Mpa.