|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Materials Processing Fundamentals
||Research on the Pinpoint Controlling of CRA N08028 OCTG Microstructure and Properties
||Pan Dong, Zhiqiang Yu, Zhifang Zhang, Genshu Zhou, Pengsheng Yao, Xitang Kang, Guangwei Fan
|On-Site Speaker (Planned)
CRA N08028 OCTG pipes and couplings for O&G down-hole application in H2S environment were prepared by hot extrusion and pilgering. Chemical homogeneity, Sigma phase precipitation, quality of raw pipe precursor, cold deformation, etc. were investigated. By diffusion annealing at 1220 ℃ for 30h, the residual segregation indices of the specified elements were all under 0.2. The raw pipe precursor was solid-solutioned by heating to 1135 ℃ and quenching to clear up the detrimental effect of Sigma phase precipitation. Finite Element Analysis indicated hot extrusion speed had a remarkable effect on the quality of raw pipe precursor and appropriate parameters could guard against wall delamination and thickness heterogeneity. The mechanical properties and corrosion-resistance had much dependence on cold deformation and ratio of 30-42% would ensure the mechanical properties meet the specifications. The corrosion test results indicated CRA N08028 OCTG by TISCO could be employed in typical sour O&G field globally.
||Planned: None Selected