PRODUCTION METHOD FOR INLINE INCREASE IN PRECIPITATION TOUGHENING EFFECT OF TI MICROALLOYED HOT-ROLLED HIGH-STRENGTH STEEL

摘要

A production method for an inline increase in a precipitation toughening effect of a Ti microalloyed hot-rolled high-strength steel, comprising: producing a casted blank by casting molten steel added with micro alloy element Ti, producing a hot-rolled roll by rough rolling, finish rolling, laminar cooling, and roll retrieving after heating, inline covering a thermally insulating cover after unrolling then moving on a conveyor belt into a steel roll warehouse, removing the thermally insulating cover when an inline thermal insulation time expires, and air cooling to room temperature, where the content of the microalloy element Ti is ≥ 0.03 wt%, the roll retrieving temperature is 500-700 °C, and the inline covering of the thermally insulating cover refers to individual covering of discrete and sealed thermally insulating apparatus within 60 minutes of each hot-rolled roll being unrolled, and the inline thermal insulation time is ≥ 60 minutes. The method is inexpensive, highly efficient, and not affected by the surrounding environment.