Effect of inclusions on impact performance of 15MnB steel

doi:10.13251/j.issn.0254-6051.2020.11.007

Abstract

Abstract: Under the influence of chemical composition and production process, MnS and TiN inclusions are easy to appear in 15MnB steel. The influence of S and Ti elements on the generation of inclusions and the impact performance of the 15MnB steel were studied through testing the steel with different S and Ti element content and with the same forging, rolling and heat treatment processes. The microstructure and inclusions of the specimen were analyzed by using optical microscope, and the chemical composition in different types inclusions was identified by using SEM and EDS. The results show that the impact performance of the 15MnB steel is the best when the S element content ≤0.0029% and the Ti element content ≤0.03%. The number and size of inclusions formed in the steel are both small, and the stability of impact performance of the steel increases with the decrease of its content when the S element content ≤0.0029%. A large amount of TiN with large size forms in the steel resulting in a significant reduction in the impact performance of the steel when the Ti element content ≥0.06%. In order to obtain good and stable impact performance, it is suggested that the species and grade of inclusions should be strictly controlled in the industrial production of 15MnB steel: inclusions of class D (thin series) ≤ grade 1.0, TiN inclusion ≤ grade 0.5, and no other types of inclusions.

Key words: 15MnB steel, inclusion, grade of inclusion, impact performance, MnS, TiN

CLC Number:

TG142

Yang Zhirong, Yan Desheng, Yang Huaijun. Effect of inclusions on impact performance of 15MnB steel[J]. Heat Treatment of Metals, 2020, 45(11): 32-37.

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