The service environment of deep-sea oil and gas pipelines is becoming increasingly harsh, making it difficult for traditional single-metal pipeline steels to meet the unique demands of such environments. Bimetal composite materials leverage the advantages of bimetal components to achieve properties that are not possible with single metal materials. Hot rolling, a solid-phase bonding process that joins pipeline steel substrates and stainless steel at high temperatures, is an efficient method for creating strong interfaces. This technique is particularly suitable for the large-scale industrial production of bimetal clad plates, necessitating the establishment of an industrial production line. To overcome the challenge posed by deformation inconsistencies that adversely affect the properties and interface bonding strength of heterogeneous bimetal clad materials during hot rolling, the precise control of the hot rolling process for X65/Inconel 625 bimetal composite plates intended for deep-sea oil and gas transportation was investigated. Thermal compression tests on the X65 pipeline steel and Inconel 625 corrosion-resistant alloy were carried out using a Gleeble-3800 thermal simulation testing machine. The flow stress, constitutive relationships, thermal working diagram, interface bending resistance, and microstructure characteristics of the bimetallic materials were examined. The results indicate that the peak stress difference in the bimetallic materials decreases as the deformation temperature increases and the strain rate decreases. At high temperatures (≥ 950 ^oC), the primary softening mechanism for X65 steel is dynamic recovery, whereas that for Inconel 625 is dynamic recrystallization. Our findings suggest that the optimal hot rolling process for the bimetal clad plate should involve a final rolling temperature of 1000 ^oC and a reduction of 70%, based on theoretical analysis and experimental data. The interface is straight and well-combined, and demonstrates strong bending deformation ability. The bimetal clad plate achieves a rolling direction yield strength of 469 MPa, tensile strength of 606 MPa, elongation of 30%, and shear strength of 442 MPa.