Effect of mold water flow rate in 40Cr billet continuous  casting on surface crack

SHI Wei-ning

doi:10.13228/j.boyuan.issn1005-4006.20220119

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Continuous Casting ›› 2023, Vol. 42 ›› Issue (2) : 84-89. DOI: 10.13228/j.boyuan.issn1005-4006.20220119

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Effect of mold water flow rate in 40Cr billet continuous casting on surface crack

SHI Wei-ning

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Abstract

In order to improve the surface cracks of 40Cr steel billet produced by Xianggang’s No. 2 continuous casting machine, the evolution of surface quality of the billet under different mold water flow rates was studied. The results show that with the increase of the mold water flow rate, the heat flux density increases first and then decreases, and the grain size on the billet surface decreases first and then increases. When the mold water flow rate is less than 2 250 L/min, a large number of abnormally grown austenite grain structures are displayed and the grain sizes are not uniform on the billet surface, the surface cracks of the billet mainly propagate along the grain boundaries. When the mold water flow rate is greater than 2 333.33 L/min, with the increase of the mold water flow rate, the heat flux density decreases, the grain sizes on the billet surface increase again, but surface cracks on the billet disappear. When the mold water flow rate is 2 333.33 L/min, the nucleation rate of molten steel near the mold wall is the largest, the grain size of the billet surface is the smallest and uniform, and the grain structure that is the most conducive to resisting stress cracking is obtained. This analysis method provides a new idea for solving the problem of billet surface cracks.

Key words

billet continuous casting / mold water flow rate / surface crack / grain size / nucleation rate

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SHI Wei-ning. Effect of mold water flow rate in 40Cr billet continuous casting on surface crack[J]. Continuous Casting, 2023, 42(2): 84-89 https://doi.org/10.13228/j.boyuan.issn1005-4006.20220119

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