Analysis on Material Defects of Circuit Breaker Oil and Gas Pipelines

The circuit breaker oil and gas pipeline was closely connected with its hydraulic mechanism and SF6 insulation system, and was an important accessory related to the mechanism's power and insulation performance. Aiming at the current high-pressure tubing fracture of the oil and gas pipeline of the circuit breaker, the cracking of the SF6 three-way valve interface bolt and the connecting pipe, the chemical composition, mechanical properties, metallographic structure and fracture morphology of each accessory were analyzed from the material point of view, and the material composition was found poor, excessive hardness and abnormal metallographic structure were the main reasons for the failure of circuit breaker oil and gas pipeline components, and technical supervision suggestions had been put forward from the aspects of network check and operation and maintenance inspections.