Study on forming and laying process of high strength pipeline steel

In order to analyze the simulation results of UOE molding and solve the buckling problem of high strength pipeline steel in the process of ocean laying, taking X80 pipeline steel sample as the object of study, a better mechanical model of kinematic hardening was adopted. With the aid of ABAQUS finite element analysis software, the finite element analysis of UOE simulation results, the loading of UOE simulation results and buckling in ocean laying are carried out. The results show that: Through the extraction of the load at the end of the welded tube and the strain at the buckling position, draw it into curves and observe the position of the strain corresponding to the inflection point of the curve. The critical strain of welded pipe subjected to buckling under different working conditions is analyzed, so it is found that the critical strain increases with the increase of internal pressure and the critical strain becomes smaller with the increase of the external pressure. The analysis method and results can also provide reference for the actual production, laying and installation of oil and gas pipelines.