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Abstract The solidification structures and the thermal properties of Fe-Mn-C steel ingots containing different Mn mass fraction have been investigated to assist the development of the continuous casting technology of Fe-Mn-C steels. The results show that the thermal conductivity of the 0Mn steel is higher than that of the 3Mn steel. The thermal conductivity of the 6Mn steel is the lowest in the three kinds of steels below 750 ℃ and the highest above 900 ℃. The 0Mn steel has the highest value of the proportion of equiaxed grain zone area in the three kinds of steels，whereas the 3Mn steel has the lowest value of it in the steels. Mn has the effect of promoting the coarsening of grains. The mean thermal expansion coefficients of the steels are at the range from 1.0×10－5～1.6×10－5 ℃－1. Using RA<60 % as the criterion，the third brittle temperature region of the 6Mn steel is 600 ℃ to 800 ℃，whereas those of the 3Mn steel and the 0Mn steel are 600 ℃ to 850 ℃ and 600 ℃ to 900 ℃，respectively. In the 6Mn and 3Mn steels，the deformation-induced ferrite（DIF） forming in sufficient quantities causes the recovery of the ductility at the low temperature end. However，since low strains are present when straightening，sufficient quantities of DIF cannot be formed. Thus，the ductility of the 6Mn and 3Mn steels cannot be improved during the continuous casting process.
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Received: 09 January 2017
Published: 29 September 2017
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2017, Vol. 52 
