Effect of Cr on dynamic CCT curves and properties of 20MnSiV gantry steel

doi:10.13251/j.issn.0254-6051.2021.07.017

Abstract

Abstract: The continuous cooling transformation behavior of forklift gantry 20MnSiV steel without Cr and with 0.3% (mass fraction) Cr was studied by thermal expansion instrument. The microstructure of the tested steel at different cooling rates was observed by optical microscope, and its Vickers hardness was measured. The dynamic continuous cooling transformation (CCT) curves of the tested steel was obtained. The results show that at the cooling rate of 0.1-10 ℃/s, the critical cooling rate of bainite transformation is decreased and the comprehensive mechanical properties are improved with the addition of 0.3% Cr. However, the mixed microstructure of bainite and martensite is easy to form in the severe segregation area, which reduces the stability of Charpy V-notch impact test value at -20 ℃. The abnormal microstructure of the finished product can be eliminated and the low temperature impact stability can be improved by taking steps of end electromagnetic stirring, reducing the final rolling temperature, increasing the deformation of the last pass and reducing the air cooling distance.

Key words: 20MnSiV steel, gantry steel, Cr, dynamic CCT curves, bainite

CLC Number:

Huo Xiwei. Effect of Cr on dynamic CCT curves and properties of 20MnSiV gantry steel[J]. Heat Treatment of Metals, 2021, 46(7): 89-93.

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