The surface quality,microstructure and mechanical properties of the finished hot-rolled plate 4J36 are observed and analyzed,and its production process parameters are further optimized. The results show that the microstructure of 4J36 is all austenite at room temperature,and there is mixed crystal in the near surface of the finished product,with different grain sizes. After optimizing the process parameters,the surface mixed crystal is effectively relieved,the internal micro-structure is evenly distributed,and the grain size of the microstructure is 7～7.5. With the decrease of furnace time,tem-perature of start-up and re-start-up,final rolling and the increase of cooling rate after rolling,the strength of hot-rolled plate 4J36 shows an upward trend,the elongation shows a downward trend;the microhardness first decreases and then increases,but its properties meet the standard requirements. The optimum production process parameters of hot rolled plate 4J36 are as follows:soaking temperature is 1160 ℃,the furnace time is 300 min,the start rolling temperature is 1050 ℃,the re-start rolling temperature is 855 ℃,the final rolling temperature is 820 ℃ and the cooling rate is 4.5 ℃/s.
hot rolled medium thick plate 4J36optimization of production processmicrostructuremixed grains
维普
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