Method for producing X65 acid-resistant pipeline steel plate used under low-cost and ultralow-temperature conditions through curling furnace

The invention relates to a method for producing an X65 acid-resistant pipeline steel plate used under the low-cost and ultralow-temperature conditions through a curling furnace. According to the method, the process comprises the steps of KR molten iron pretreatment (advanced desulfurization), BOF smelting, RH vacuum degassing, LF refining, RH vacuum degassing, continuous casting to form a continuous casting billet with the thickness of 150 mm, continuous casting billet covering slow cooling, continuous casting billet checking and cleaning, casting billet reheating, high-pressure water descaling, rolling, flying shear segmentation, ACC cooling, straightening, steel plate shearing and inspection and warehousing. The method has the advantages that the yield strength of the steel plate is 460-600 MPa, the tensile strength is 550-700 MPa, the elongation rate is greater than or equal to 30%, the yield strength ratio Rt0.5/Rm is less than or equal to 0.90, and the product can meet the use requirements under the ultr