Effect of heat treatment on mechanical properties and low temperature toughness of 3.5Ni steel with different carbon content

doi:10.13251/j.issn.0254-6051.2021.10.032

Abstract

Abstract: Effect of heat treatment on mechanical properties and low temperature toughness of two types of 3.5Ni steel with different carbon contents was studied by means of tensile testing and low temperature impact testing, and the microstructure of the steel was observed by means of optical microscope and SEM. The heat treatment of the two types of 3.5Ni steel hot-rolled plates were normalizing (860 ℃ for 1 h, air cooling) and quenching and tempering (860 ℃ for 1 h, water quenching and then tempering at 580, 610 and 640 ℃ for 1 h). The results show that the 3.5Ni steel with high carbon content has low strength and high absorbed plasticity after hot rolling, but low impact absorbed energy at －100 ℃. After normalizing treatment, the overall properties of the tested steel are decreased, while after quenching and tempering treatment, the strength and low temperature impact absorbed energy are significantly improved, while the plasticity is slightly reduced. The 3.5Ni steel with low carbon content has excellent tensile properties and low temperature impact properties after hot rolling, but the tensile properties and low temperature toughness have no significant improvement after heat treatment.

Key words: 3.5Ni steel, heat treatment, low temperature toughness, mechanical properties

CLC Number:

TG142.1

Liu Haisheng, Li Jing, Wang Huigang, Yang Yuehui, Liu Jinxu, Wu Huibin. Effect of heat treatment on mechanical properties and low temperature toughness of 3.5Ni steel with different carbon content[J]. Heat Treatment of Metals, 2021, 46(10): 182-186.

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