熔炼分厂使用的打炉结机杆（见图１）是我厂从英国引入的成套设备。该打炉结机杆是由特殊材质铬镍钼钢制成，具有良好的机械性能，强度高，韧性大，而且耐高温。该机杆在使用的过程中，最易损坏的部位就是端口螺纹处机杆发生断裂，纵观分厂送来待修的打炉结机杆，发现所有机杆? The melting furnace used to hit the hearth rod machine (see Figure 1) is my plant from the United Kingdom introduced complete sets of equipment. The hitter knot machine pole is made of special material chrome nickel molybdenum steel, has good mechanical properties, high strength, toughness, and high temperature. The lever in the use of the process, the most vulnerable parts of the port is the thread at the pole fracture occurs, look at the factory sent to be repaired hit the knot machine pole and found all the machine pole?