Effect of rare earth on low temperature impact property of L360 pipeline steel

doi:10.13251/j.issn.0254-6051.2023.05.019

Abstract

Abstract: L360RE pipeline steel was industrial produced, and the effect of trace rare earth elements on inclusion modification, hot rolled microstructure and low temperature impact property of the L360 pipeline steel was studied. The results show that adding 0.0062% rare earth, the content of O and S in the L360 pipeline steel is sharply reduced, the cleanliness of molten steel is significantly improved. The type of inclusions changes from MnS inclusions and Al₂O₃-CaO composite inclusions to RE₂O₂S rare earth inclusions, and the original large-size strip-shaped or irregular inclusions become small-size spherical inclusions, and the grain size decreases and the microstructure is refined, the transverse impact absorbed energy from room temperature to -60 ℃ is increased. At -60 ℃, the transverse impact absorbed energy of the L360RE pipeline steel is 19.2% higher than that of L360 pipeline steel.

Key words: rare earth, L360 pipeline steel, inclusion, low temperature impact property

CLC Number:

TG142.31

Wang Hongli, Feng Liang, Fan Xuanyu, Yu Yanchong. Effect of rare earth on low temperature impact property of L360 pipeline steel[J]. Heat Treatment of Metals, 2023, 48(5): 116-120.

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