Discussion and Analysis of Strength Fluctuation for the Same High Strength Hot Strip Roll

In accordance with the problem of strength fluctuation with the same high strength hot strip roll, by means of SEM, TEM, EBSD and chemical phase analysis, the phenomenon of strength fluctuation has been studied through these experiments of tensile test and temperature detection. The results show that mechanical properties of hot rolled high strength steel are uneven. The head and tail of steel are very different, while the middle part is even. This phenonmen is decided by difference of precipitation strengthening, dislocation strengthening and fine crystal grain strengthening in the different parts of the same coil. So it can supply the help to manufacture high strength steel with the field produce.