Influence of continuous annealing process on microstructure and mechanical properties of DC07 ultra-low carbon steel
The continuous annealing process has an important influence on the mechanical properties of DC07 ultra-low carbon steel.The influence of continuous annealing process parameters such as annealing temperature,slow cooling temperature and fast cooling rate on microstructure and mechanical properties of DC07 ultra-low carbon steel was studied by continuous annealing simulator of VAI.The results showed that the microstructure of DC07 ultra-low carbon steel annealed at 830-860 ℃ was fer-rite.With the increase of the annealing temperature,the grain size increased gradually and the distribution were uniform.The tensile strength and yield strength decreased,the elongation,the n value and the r value increased with the increase of the annea-ling temperature.With the increase of the slow cooling temperature,the strength of DC07 ultra-low carbon steel decreased,the elongation and the r value increased,and the n value just changed a little.The mechanical properties of DC07 ultra-low carbon steel just changed a little with the increase of the cooling rate.
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