Abstract
The 0.1%C–5%Mn steel is a new type low carbon medium-manganese steel adapted to the requirements of auto light weight, good safety, low energy consumption and low manufacturing cost. Lots of thermal simulation experiments and macrostructure detections have been carried out to analyse solidification characteristics of this steel. The effect of composition of steel, casting process and slab section on solidified structure and the quality defects have been analysed. The results showed that there are interdendritic crack, centre segregation, porosity and shrinkage cavity in the internal of this steel. In order to improve internal quality of the ingot, small cross section ingot should be chosen preferentially to obtain small dense structure by increasing the cooling rate meanwhile the ingot stripped should be cooled slowly. The main casting measures for heavy section ingot should include reducing the degree of superheat and casting speed, slowing down the mould cooling intensity, prolonging the ingot upper cap time and using slow cooling mode.
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