Hot rolling process of non-tempered bainitic steel pipe for oil drilling

doi:10.13251/j.issn.0254-6051.2025.02.035

Abstract

Abstract: Effects of reheating temperature, cooling rate after rolling and tempering temperature on the microstructure and properties of hot-rolled non-tempered bainitic steel pipe for oil drilling were studied by laboratory heat treatment simulation. The results show that the reheating temperature decreases from 930 ℃ to 850 ℃, the sizes of bainite and lath martensite become smaller, and the impact absorbed energy of air-cooled tested steel increases from 19.48 J to 35.26 J. When reheated at 850 ℃, the microstructure is lath and packet martensite and granular bainite, the impact absorbed energy of air cooled tested steel is higher than that of furnace cooled. However, the impact property of the tested steel decreases after tempering at 300-400 ℃. In the actual production, the reheating temperature of the steel pipe during hot rolling should be properly reduced, and the cooling rate after rolling should be properly accelerated, so as to obtain the high toughness of the non-tempered bainitic steel pipe.

Key words: controlled rolling and cooling, non-tempered bainitic steel, impact property, microstructure

CLC Number:

TG142.1

Ma Lina, Wang Xiaoyu, Nie Shunuo, He Jiaqi, Ouyang Siyi, Niu Sai, Wu Meng. Hot rolling process of non-tempered bainitic steel pipe for oil drilling[J]. Heat Treatment of Metals, 2025, 50(2): 225-229.

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