Experimental simulation research on TMCP of 30MnCr22 oil well pipe

Abstract

Thermo-mechanical controlled process (TMCP) of 30MnCr22 oil well pipes was investigated by experimental simulation. The results showed that controlled rolling of TMCP effectively exerted the comprehensive effects of grains refinement by recrystallization in piercing and continuous rolling and deformation strengthening by strains accumulation in the non-recrystallization zone of reducing deformation. And the key point of TMCP is that quenching realized the microstructural heritability of fine and strengthened austenite, which achieved the best refinement of martensite laths to be 170 nm, nanoscale carbides with the average size of 101 nm and dislocations with the high-density of 8.38×109 mm-2, presenting a kind of complicated multi-layer microstructural characteristics. Finally, the synergistic strengthening effects on fine grain strengthening, laths refinement strengthening, dislocation strengthening and precipitation strengthening were realized by TMCP. Further, the synergistic strengthening mechanisms are explored to be that quenching enforced the interaction between martensite laths and dislocations, as well as the entanglement between θ-(Fe, Cr)3C and dislocations.

Effect of Ce on Inclusions and Precipitates in 10Cr5MoV Steel and the Microscopic Behavior of Solid Solution Ce in Steel

“…Oil and gas fields are often located in harsh service environments, such as ultra-deep wells, or places with high temperature, pressure, acidity, salinity, and/or CO 2 and H 2 S corrosion. [1][2][3] The safety of oil and gas equipment in highly corrosive environments has become a key requirement for oil and gas resource development. Oil well pipe steel is an important part of oil and gas production equipment.…”

Seamless Pipes Manufacturing Process Improvement Using Mandreling

“…We propose to push a special profiled mandrel -a draw bar through the pipes upon pipes cooling to improve diameter precision and to enhance pipes external and internal surface quality. Computer modeling will be performed at the first stage to verify the possibility to implement this process as well as to analyze the specific features of metal forming during mandreling [23,24].…”