Finite Element Simulation of Upset Value of 13Cr Tubing

Described in the article is a new process（reducing process） for tubing end upsetting which consists two steps，i.e.，first outer circumferential upsetting，then reducing. A FE model of pipe-end plastic forming process is established to simulate the metal flow laws of the conventional upset process（the cumulative process） and the foresaid new process for the 13Cr tubing end，and the influences thereby on the forming process. The result of simulation of the new upsetting process is compared with that of relevant actual production. And the comparison result demonstrates that the former is basically in coincidence with the latter，which means that the simulation result is reliable. The end of the 13Cr tube as upset and deformed via the said reducing process has smooth and neat outer and inner surfaces free of any obvious defects like pit，ripple and fold，etc.