Ultra-strong residual magnetism elimination equipment for straight seam steel pipe with residual magnetism of more than 600 gauss

The utility model discloses an ultra-strong residual magnetism eliminating device for a straight seam steel pipe with more than 600 gauss of residual magnetism, which comprises a starting contactor KM1, a voltage regulator T, a rectifier bridge-R, a negative polarity contactor KM2, a positive polarity contactor KM3 and a degaussing coil R. The inner diameter of the degaussing coil is 30mm-80mm larger than the outer diameter of the steel pipe, a 220V alternating-current power supply is connected to the primary of the voltage regulator T through the starting contactor KM1, and the secondary of the voltage regulator T is connected to the rectifier bridge-R through the rectifier bridge-R; the secondary side of the voltage regulator T is connected with the alternating current input end of the rectifier bridge-R. The direct current voltage output end of the rectifier bridge-R is connected with the degaussing coil R through the negative polarity contactor KM2 and the positive polarity contactor KM3, and the degaussi