Effect of alloying element content on microstructure and mechanical properties of 610L steel for automobile beam

doi:10.13251/j.issn.0254-6051.2023.01.008

Abstract

Abstract: A new type of 610 MPa grade Ti-Nb-Si microalloyed low carbon steel for automotive beam was designed based on the alloy design concept of increasing Si slightly, reducing Nb and raising Ti, combining with optimizing the thermo-mechanical control process (TMCP) parameters. The results show that the microstructure of the steel with 0.04%Si, 0.03%Nb and 0.06%Ti water cooled (15-20 ℃/s) to the coiling temperature after hot rolling is ferrite + pearlite, with high density nano-precipitates distributing in the ferrite matrix, exhibiting a good comprehensive properties with the yield strength of 539 MPa,the tensile strength of 633 MPa, the elongation of 20.5% and the hole expansion ratio of 66.4%, all meeting the requirements of both the mechanical properties and the hole expansion formability of 610L steel.

Key words: automotive beam steel, microalloying, thermo-mechanical control process, microstructure, mechanical properties

CLC Number:

TG142.1

Yang Wenqing, Shi Kexin, Dong Junhai, Sun Shenghui, Cai Minghui, Zhang Xiaoming, Ding Hua. Effect of alloying element content on microstructure and mechanical properties of 610L steel for automobile beam[J]. Heat Treatment of Metals, 2023, 48(1): 40-45.

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