The invention discloses a preparation method of an anticorrosion coiled steel
pipe for the marine environment. The method includes the steps of firstly, detecting a plate; secondly,
cutting the plate through flames and blanking, and forming grooves; thirdly, conducting coiling, wherein a polished steel plate is coiled into an O shape through a supporting type coiling technology; fourthly, conducting
pairing, roundness correcting and longitudinal seam UT flaw detecting; fifthly, conducting longitudinal seam internal and external
welding, wherein in the internal
welding process and the external
welding process, an anticorrosion welding agent are adopted, and a
laser welding seam automatic tracking device with tracking precision of 0.25 mm is adopted; sixthly, conducting annular
seam welding; seventhly, conducting welding seam residual height
grinding, wherein seam surplus height is ground flat through a seam surplus height
grinding machine; eighthly, conducting annular seam UT flaw detecting and X-
ray flaw detecting; ninthly, marking the product for leaving a factory. The method is simple and solves the problems that an existing steel
pipe for the marine environment is short in validity period, prone to
ageing, poor in
weather resistance, poor in
corrosion resistance, low in size precision and the like.